Biology Questions and Answers Form 4

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Biology Questions and Answers Form 4

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Biology Form 4 Notes – Biology Form Four Notes

a) i) Define the term genetics

the study of heredity(inheritance) and variation or study of mechanisms by which
characteristics are passed from parents to offspring

ii) List some characteristics which are inherited

size

height/length

colour/type

shape

yield

iii)State the importance of genetics

helps to explain differences between organisms of the same species

helps to explain the transmission of characters from generation‘ to generation

improvement in livestock

improvement in crops

can be used to treat some difficult diseases

b) i) Explain the meaning of the following terms

Heredity

the resemblance among individuals related by descent

transmission of traits from parents to offspring

Trait

also called character

A character of the organism e.g. type of ear, colour of eyes, height, yield etc.

Gene

unit of inheritance

it is the heredity factor which transmits traits from parents to offspring

genes are located at ‘fixed points on chromosomes

each point is called a locus (loci)

Allele

genes can exist in a series of alternative forms at a particular locus

allele refers to alternative forms of genes controlling a particular characteristic

Chromosomes

threadlike structures found in nuclei of all plants and animals

they carry genes which are hereditary materials

they consist of substances called DNA and proteins called histosones

DNA

deoxyribonucleic acid

substances that make up chromosomes

double helix(strand) molecule that contains genes

DNA consists of nucleotides

A nucleotide consists of an inorganic phosphate, ribose sugar and a base

There are four bases in a DNA molecule i.e. Adenine(A), guanine(G), thymine(T) and
cystosine (C)

Ribose sugar has four bases attached to it i.e. adenine, cystosine, guanine and thymine

Adenine pairs with thymine while guanine pairs with cystosine

Nucleotide initiates and controls protein synthesis

ii) List the types of chromosomes

somatic (body) chromosomes also called autosomes

sex chromosomes (related to reproduction)

c) i) What is variation?

sequence of differences occurring among individuals of the same species

ii) State the causes of variation in organisms

random assortment of genes during meiosis

crossing over

fertilization

doubling of chromosome numbers(mutation)

environmental conditions

iii) Name the types of variation

Continuous variation (differences not clear cut) e. g. height, length, weight, skin colour,
intelligence etc. They are quantitative and show intermediates

discontinuous variation(differences are clear cut) e. g. ability to roll tongue, ABO blood
grouping system, RH factor, patterns of fingerprints, and ability to taste PTC. They are
qualitative and have no intermediates

iv) Explain the following terms

Acquired characteristics

they are as a result of adaptations due to the environment and are not inherited
Inherited characteristics

are passed down to offspring during sexual reproduction

Genotype

genetic constitution of an individual/genetic makeup

Phenotype

characteristics of an individual observed or discernible by other means i.e. observable
character

Dominant gene (character)

expressed in the phenotype when homozygous or heterozygous

Recessive gene

only expressed in homozygous state

Homozygous

when two alleles are identical e.g. LL,ll

Heterozygous

when two alleles are different at a particular locus e.g. Ll

F1 and F2

Fl means first filial generation i.e. the first generation produced when two varieties can
be crossed

F2 means second generation i.e. product of offspring or from F1 generation

d) i) Explain Mendels first law of inheritance

also called law of segregation

it states that genes are responsible for the development of individual characters

these characters are transmitted individually without any alterations

Only one character from a contrasting pair can be carried in a gamete, hence only one
character can be inherited.

ii) Give an example of this law

In an experiment, Drosophila (fruit fly) with long wings were crossed with those having
short wings. Assume letter L denotes gene for wing size. The gene for long wings is
dominant to that for short wings

the genes for dominant are LL and for recessive ll.

State the expected results for the first cross

iii) What is monohybrid inheritance?

when inheritance of one character is studied one at a time e.g. wing size only

the F2 generation (when selfed) always gives a phenotypic ratio of 3:1 and a genotypic
ratio of 1:2:1 in a complete dominance

i) What is complete dominance?

refers to where only one dominant character is expressed while the other character which
is recessive is not expressed in the heterozygous state e. g. the case of wing size above

e) i) What is meant by co dominance?

When genes produce independent effects when heterozygous/none of the genes is
dominant over the other/where two or more alleles does not show complete
dominance/recessiveness due to the failure of any allele to be dominate in a heterozygous
condition.

ii) Give an example of co dominance

In a certain plant species, some individual plants may have only white, red or pink flowers.
In an experiment a plant with white flowers was crossed with a parent with red flowers. Show results
of Fl generation. Use letter R for red gene and W for white gene.

If the plants form F1 were selfed, work out the phenotype ratio for the F2 generation
Phenotypic ratio 1 red:2 pink: 1 white

Genotypic ratio 1:2:1

f) i) What is a test cross?

A cross between an individual showing a character for a dominant gene(that is homozygous or
heterozygous) with a homozygous recessive individual

OR

a cross between individual(organism) of unknown genotype with a homozygous recessive
individual

ii) State the importance of a test cross in genetics

helps in determining the genetic constitution/genotype of an organism

iii) What are multiple alleles?

a set of more than two alleles that may determine a character

example is blood group which can be determined by any two of three alleles i.e. A,B and
O

iv) Explain the inheritance of ABO blood groups

in humans blood groups are determined by three alleles i.e. A,B and O

it is only possible to have two genes at a time

genes A and B are co-dominant while gene O is recessive to genes A and B

Give a worked example using parents with heterozygous blood groups Ao and BO

ii) Explain the inheritance of Rhesus factor (Rh) in human beings

in humans blood is either Rh positive or Rh negative

people who have Rh antigen are Rh(+ve) while those without Rh antigen in their blood
are Rh(-ve)

Rh(+ve) is due to a dominant gene while the recessive gene causes lack of Rh factor.

When a person who is homozygous dominant marries a person who is homozygous

recessive the result is as shown below

Let the gene for dominant Rh factor be R while gene for recessive be r

iii) How is sex determined in human beings .

there are two sex chromosomes in humans, x and y

males are xy and females are xx

in females all ova have x chromosome

in males 50% of sperms contain x chromosomes While 50% of sperms contain y

chromosome

when a sperm containing x chromosome fuses with an ovum this results into a girl

when a sperm containing y chromosome fuses with an ovum the result is a boy

an example is given below

g) i) What does the term linkage mean?

– These are genes which occur together on a chromosome and are passed to offspring without
being separated

ii) Define the term sex-linked genes

genes carried in the sex chromosome that are transmitted along with genes that determine
sex

iii) What is meant by the term sex linkage?

genes are located on the sex chromosome

they are transmitted along with those that determine sex

iv) Name the sex-linked traits in humans

colour blindness

haemophilia

Hairy ears. pinna, nose

Baldness

Duchene muscular dystrophy (DMD) muscular wasting

v) Give an example of a sex linked trait in humans on:

Y Chromosome

tuft of hair sprouting from pinna/baldness

X Chromosome

colour blindness/haemophilia

vi) In humans red-green colour blindness is caused by a recessive gene C, which is sex-
linked. A normal man married to a carrier Woman transmits the trait to his children. Show
the possible genotypes of the children.

Let C represent the gene for normal colour vision (dominant)

Let c represent the gene for colour blindness

Parental phenotype Norman man x carrier woman

iv) State the importance of sex linkage

possible to determine sex of day old chicks

v) Haemophilia is due to a recessive gene. The gene is sex-linked and located on the
x chromosome. The figure below shows sworn offspring from phenotypically
normal parents

What are the parental genotypes?

XY and XhX

Work out the genotypes of the offspring

h) i) What is mutation?

sudden change in the structure of DNA at a particular locus/chromosome/ gene

ii) Describe how mutations arise

mutations arise due to alterations in normal number of chromosomes

change in a portion of a chromosome affecting one or more genes

by chromosomal aberration e.g.
dleltion/duplication/substitution/inversion/translocation/crossing over

caused by mutagenic agents e. g. radiation (x-rays, ultra violet light, gamma rays) and
chemicals e. g. mustard gas/colchicines

iii)State the factors that may cause mutation

these are chemicals and radiations

Radiations Effects

X-rays gene/chromosome alteration

Ultra violet rays structural distortion of DNA

Chemicals Effect

colchicines prevents spindle formation

Cyclamate chromosome aberrations

Mustard gas chromosomes aberrations

Nitrous acid adenine in DNA is deaminated so behaves like guanine

Acridone orange addition and removal of bases of DNA

Formaldehyde

iv) State the characteristics of mutations

arise suddenly

are unpredictable

random

generally rare

may breed true

some are desirable while others are lethal

v) Explain chromosomal mutation

– Change in nature, structure or number of chromosomes

vi) Explain how the following types of chromosomal mutations occur

Duplication

a section of a chromosome is repeated/replicates

therefore genes are repeated

Inversion

occurs when chromatids break at 2 places and when rejoining the middle piece rotates
and joins in an inverted position

Deletion

portion of a chromosome is left out after it breaks off

alters number and sequence of genes

Translocation

occurs when a section of a chromatid breaks off and becomes attached to another
chromatid of another chromosome

Non-disjuntion

Failure of homologous chromosomes/sister chromatids to separate/segregate during meiosis

Polyploidy

where number of chromosomes double or triple

beneficial in plants due to the following

increased yields/hybrid vigour//heterosis

resistance to pests

early maturity

resistance to drought

resistance to diseases

vii) What are gene mutations?

an alteration in the structure of a gene

i) Explain how the following occur during gene mutation

Deletion

some bases/nucleotides of a gene are removed

Inversion

the order of some bases/nucleotides of a gene is reversed

Insertion

addition of a base between two existing bases

Substitution

a portion of a gene is replaced by a new portion

ii) Name the disorders in humans caused by gene mutation

albinism

sickle cell anaemia

achondroplasia/chondordystorphic dwarfism

haemophilia

colour blindness

phenylketonuria

I. State the practical applications of genetics

i. Breeding programmes (research)

high yielding/hybrid vigour/heterosis

resistance to diseases

resistance to drought/salinity

early maturing

ii. Genetic engineering

genetic manipulation to produce desired characteristics

iii. Law

– legal questions of paternity knowledge of blood groups or blood transfusion

iv) Genetic counseling

aimed at reducing harmful traits e.g. albinism, congenital idiots, colour blindness e.t.c

v) Others

– Pre-sex determination

Understanding human evolution and origin of other species.

2. a) i) Explain the meaning of evolution

a gradual change in living organisms from simple life forms to more complex forms over
a long period of time.

ii) Differentiate organic evolution from chemical evolution as theories of origin of life

organic evolution refers to the emergence of present forms of organisms gradually from
pre-existing forms (some of which no longer exist)

chemical evolution explains the origin of life as having occurred when simple chemical
compounds reacted to form the simplest life forms

iii) What is special creation?

maintains that the whole universe and all living organisms came into being due to the act
of a supernatural being

b) Discuss the various kinds of evidence for evolution

i) Fossils

fossils are remains of organisms preserved in naturally occurring materials for many
years

they give evidence of types of plants/animals that existed at certain geological age/long
ago/millions of years ago

gives evidence of morphological/anatomical/structural changes that have taken place over
a long period of time e. g. human skull, leg of horse

ii) Comparative anatomy

gives evidence of relationship among organisms/gives evidence of a common ancestry of
a group of organisms

organisms have similar structures/organs performing the same function e. g. digestive
system] urinary system/nervous system/vestigial structures and vertebrate heart

Divergence where the basic structural form is modified to serve different functions e.g.
vertebrate forelimb/beak structure in birds/birds feet/parts of a flower. These are called
homologous structures

homologous structures have a common embryonic origin but are modified to perform
different functions e.g. the pentadactyl limb

adaptive radiation is a situation where organism have a homologous structure with
common embryonic origin which is modified to perform different functions to adapt
organisms to different ecological niches/habitats e.g. beaks of Darwinian finches(birds)

Convergence is where different structures are modified to perform a similar function e.g.
wings of birds and insects/eyes of humans and octopuses. These are called analogous
structures

Vestigial structures are greatly reduced in size and have ceased to function e.g. human
appendix/caecium/coccix in humans, wings of kiwi (flightless bird), presence of hind
limb pad in python, halters in insects, human hair nictitating membrane in human eye,
human ear muscle, pelvic girdle in whale and third digit of wing of bird.

iii) Comparative embryology

some embryos of different animals appear very similar thus showing relationship and
possibility of a common ancestry

e.g. different classes of vertebrates larvae of annelida and mollusca are similar
(tocophere)

iii) Comparative serology/physiology

these show biochemical and immunological comparisons of blood groups/components to
show immunological similarities of tissues therefore showing relatedness of different
organisms

e.g. antigen antibody reactions, human blood groups/Rh factor reveal some phylogenic
relationship among organisms/common ancestry

iv) Geographical distribution

organisms differ in various geographical regions

present continents are thought to have been a large land mass joined

together/pangea/Eurasia/Gondwanaland

present continents drifted apart from one land mass/continental drift

as a result of continental drift isolation of organisms occurred bring about different
patterns of evolution

organisms in each continent evolved along different lines hence emergence of new
species/divergence/convergence

Examples

marsupials in Australia

llama, jaguar, panther in S. America

lion, camel in Africa

I tiger in Asia

vi) Cell biology (cytology)

structures and functioning of cells are similar

occurrence of organelles e.g. mitochondria in all cells/both plant and animal cells

these point at a common ancestry

c) i) State the evolutionary characteristics that adopt human beings to the environment

– Brain

– Eyes

– Upright posture/bipedal locomotion

– prehensible arm/hand

– Speech

ii) State the ways in which Homo sapiens differs from Homo habilis

standing upright/erect posture

intellectual capacity/higher thinking capacity/bigger brain/higher brain capacity

communication through language/speech

d) i) Explain Larmarck’s theory of evolution

– Inheritance of acquired characteristics/environment induces production of a favorable
trait which is then inherited

ii) Explain why Lamarck’s theory of evolution is not accepted by biologists today

– evidence does not support Lamarck’s theory

– acquired characteristics are not inherited/inherited characteristics are found in
reproductive cells only

iii) Explain Darwin’s theory of evolution

– inheritance of genetically acquired characteristics

– a character happens to appear spontaneously which gives advantage to an organism
therefore adapted then inherited through natural selection

e) i) What is natural selection?

– Organisms with certain characteristics are favoured by the environment

Such organisms tend to survive and produce viable offspring

Others not favored are eliminated from subsequent generations

ii) With examples, explain how natural selection takes place

– organism with certain characteristics are favored by their environment

– such organisms tend to survive and produce viable offspring

– others not favored are eliminated from subsequent generations

– as the environmental conditions change the survival value of a character may alter with
time so that characteristics which were favored may no longer have advantage and other
characters may then become favorable

– if a favorable character is inherited, then offspring produce generations which are better
adapted to survive in a population

– more offspring are produced than can survive which results in struggle for survival
– the fittest survive

iii) State the advantages of natural selection to organisms

– assist to eliminate disadvantageous characteristics/perpetuates advantageous
characteristics

– allows better adapted organisms to survive adverse changes in the environment/less
adapted organisms are eliminated

iv) State the ways in which sexual reproduction is important in the evolution of plants and
animals

– brings about useful variations/desirable characters

– variations make offspring better adapted for survival/more resistant to diseases

– may lead to origin of new species

v) Explain the significance of mutation in evolution

– Mutation bring about variation which can be inherited

– Some of these variations are advantageous to the organism

– Others are disadvantageous

– The advantageous variations favour the organism to compete better in the struggle for survival

– This results into a more adapted organism to its environment or new species/varieties

– Those with disadvantageous characters will be discriminated against therefore eliminated from
the population/death/perish

vi) Plain why it is only mutations in genes of gametes that influence evolution

– gametes form the new offspring

vii) How would you prove that evolution is still taking place?

– resistance of organism to antibiotics, pesticides and drugs

– new varieties of bacteria are resistant to certain antibiotics such as penicillin

– houseflies and mosquitoes are resistant to DDT

vii) Explain why some bacteria develop resistance to a drug after they have bee
subjected to it for some time

– bacteria mutates/develops a new strain/chemical composition is altered hence is able to
produce enzymes/chemicals which degrade the drug rendering it non-susceptible to the
drug

– the new strain is favoured by selection pressure natural selection

f) How has industrial melaninism i.e. peppered moth contributed towards the mechanism
of evolution

– This is an example of natural selection

– The peppered moth exists in two distinct forms, the speckled white form (normal form) and a
melanic form (the black/dark)

– They usually rest on leaves and barks of trees that offer camouflage for protection

– Originally the “speckled white” form predominated the unpolluted area of England

– This colouration offered protection against predatory birds

– Due to industrial pollution tree barks have blackened with soot

– The white form underwent mutation

– A black variety/mutant emerged suddenly by mutation

– It had selective advantage over the white forms that were predated upon in the industrial areas

– The speckled white form is abundant in areas without soot/smoke

3. a) i) Define irritability, stimulus and response irritability

-also called sensitivity

– Responsiveness to change in environment

Stimulus

A change in the environment of organism which causes change in organism’s activity

Response

– change in activity of an organism caused by a stimulus

ii) State importance of irritability to living organisms

– Adjusting to environmental conditions. Sensitive/defect/responding

iii) List the examples of external stimuli to organisms

– air/oxygen (aero)

– light(photo)

– osmotic pressure (osmo)

– current (Rheo)

– chemical concentration (chemo)

– water/moisture (hydro)

– Touch/contact (hapto/thigmo)

– Gravity/soil (geo)

– Temperature (thermo)

b) i) What are tactic responses?

– response in which whole organism or its motile parts move e. g. gamete

ii) What causes tactic responses?

– caused by unidirectional stimulus

– usually doesn’t involve growth

– response is either positive or negative

– named according to source of stimulus

– e.g phototaxis, aerotaxis, chemotaxis

iii) State the importance of tactic response to:

Members of kingdom protista

– move towards favorable environment/move away from unfavorable environment

– move towards their prey/food

Microscopic plants

– escape injurious stimuli/seek favorable habitats

iv) Name the type of response exhibited by:

Euglena when they swim towards the source of light

– phototaxis

– sperms when they swim towards the ovum

– chemotaxis

v) State the advantages of tactic responses to organisms

– to avoid unfavorable environment/injurious stimuli

– escape from predators

– to seek favorable environment

– to seek for food/prey

c) i) Define the term tropism

– growth movement of plants in response to external unilateral/unidirectional stimuli

ii) Explain the various types of tropism in plants

Phototropism

– growth movements of plant shoots in response to unilateral sources of light

– the tip of the shoots produce auxins down the shoot

– light causes auxins to migrate to outer side/darker side causing growth on the side away
from light hence growth curvature towards source of light roots are negatively
phototrophic

Geotropism

– response of roots/pans of a plant to the direction of force of gravity

– auxins grow towards the direction of force of gravity causing positive geotropism in roots
while shoot grows away from force of gravity (negatively geotrophic)

Thimotropism/Haptotropism

– growth response of plant when in contact with an object

– contact with support causes migration of auxins to outer side causing faster growth on the
side away from contact surface

– this causes tendrils/stem to twin around a support

Hydrotropism

– growth movement of roots in response to unilateral source of water/moisture

– the root grows towards the source of water/ positively hydrotropic while leaves are
negatively hydrotropic

chemostropism

– growth movement of parts of plant to unilateral source of chemicals

– the chemicals form a gradient between two regions e.g. pollen tube growing towards the
ovary through the style

iii) State the ways in which tropisms are important to plants

– expose leaves/shoots in positions for maximum absorption of sunlight for photosynthesis

– enables roots of plants to seek/look/search for water

– enables plant stems/tendrils to obtain mechanical support especially those that lack
woody stems.

– enables roots to grow deep into the soil for anchorage

– enables pollen tube grow to embryo sac to facilitate fertilization

iv) Explain the differences between tropic and tactic responses

Tropism

-growth curvature in response

-slow

-influenced by hormones

Taxes

-locomotory response

-fast

-external influence

d) The diagram below represents growing seedlings which were subjected to unilateral
light at the beginning of an experiment

i) State the results of P, Q and R after S days

– P will bend/grow towards light

– Q will remain straight/have little or no growth

– R will remain/grow straight/grow upwards

ii) Account for your results in (i) above

P- Growth substance/growth hormone/IAA/auxin are produced by the stem tip

– they move (downwards and get distributed) to the side away from light where they cause
rapid/more growth/cell division/elongation that results in bending

Q- Source of auxin has been removed

R- The auxins cannot be affected by light because the tip has been covered

iii) If the tin foil were removed from the tip of seedling R, what results would be
observed after two days

– it will bend/grow towards light

iv) State the expected results after 3 day is if the box were removed

– all seedlings will grow straight/upwards

e) In an experiment to investigate a certain aspect of plant response, a seedling was placed
horizontally as shown in diagram I below. After seven days the appearance of the seedling
was as shown in diagram 2

Account for the curvature of the shoot and root after the seven days

i) Shoot

– auxins accumulate on the lower side of the seedling due to gravity

– high concentration of auxins in shoot stimulates faster growth causing more elongation
on the lower side than the upper side hence curvature occurs upwards

ii) Root

– the high concentration of auxins inhibits growth hence the upper side with less auxins
grows faster than the lower side therefore the curvature occurs downwards

f) What is etiolation?

– phenomenon exhibited by plants when grown in darkness

– such plants are pale yellow due to absence of chlorophyll, have small leaves, long
stems/hypocotyle and slender stems

– plants exhibit etiolation to reach light/obtain light

– this is a survival response

4. a) i) What is coordination in animals

– The linking together of all physiological activities that occur in the body so that they take place
at the night time and in the correct place

ii) Name the main systems for coordination in animals

– Nervous system/sensory system

– Endocrine (hormonal system)

iii) List the components of the mammalian sensory system

– Central nervous system (CNS), brain & spinal cord

– Peripheral nervous system (PNS) cranial and spinal nerves

– Sense organs

– Autonomic nervous system (ANS) nerve fibers and ganglia

iv).Explain the terms receptors, conductors and effectors

– Receptors are structures that detect stimuli i.e. sense organs

– Conductors transmit impulses from receptors to effectors e. g. neurons

– Effectors are the responding parts e.g. muscles, glands

v) What are the functions of the central nervous system?

– provides a fast means of communication between receptors and effectors

– coordinates the activities of the body

vi) State the differences between somatic and autonomic systems of peripheral nervous
system

– Somatic is concerned with controlling the conscious or voluntary actions of the body i.e. skin,
bones, joints and skeletal muscles

– the autonomic (automatic) nervous system controls involuntary actions of internal organs,
digestive system, blood vessels, cardiac muscles and glandular products.

b) i) What is a neurone?

the basic unit of the nervous system

also called nerve cell

conducts impulses

include monitor sensory and relay neurons

ii) Name the parts of a typical neurone and state the functions of each part

cell body/centron contains nucleus and cytoplasm

axon transmits impulses away from cell body

dendrites relays impulses across adjacent neurons

myelin sheath insulates axon and speeds up transmission of impulses

schwan cells forms myelin sheath and aid in nutrition and regeneration of axon

node of ranvier occur between schwan cells, where axon is not covered, speeds up
impulse transmission

nissils granules contain mitochondria that provide cell body with energy for metabolic
process

i) Describe the structure and function of a motor neurone

motor neurone relays impulses from CNS (brain/spinal cord) to effectors (
muscles/glands)

ii) Describe the structure and of sensory neurone

sensory neurone relays receptors (sense organs) to CNS

iii) State structural differences between motor and sensory neurons

Cell body in motor neurone is terminal (at the end) and inside central nervous system.

Cell body in sensory neurone is terminal but has axon at both ends (bipolar)

iv) Describe the structure and function of a relay neurone

also called intermediate/internucial/associate/connector/interneurone

locate inside central nervous system and spinal code

usually lack myelin sheath

c) State the function of the major parts of the human brain

i) Cerebrum

called forebrain

occupies most of the brain

consists of four lobes each with specific function

temporal lobe controls taste smell hearing learning and memory

partial lobe controls sensory output and touch

occipital lobe controls vision, motor output and speech

frontal lobe controls personality, learning thought and speech

also has parts called thalamus and hypothalamus

thalamus helps to sort sensory information

hypothalamus controls hunger, heartbeat body temperature and aggression

ii) Mid brain

quite small in humans

relay centre for audio and visual information

also involves in some sight, hearing and orientation responses

i) Hind brain

consists of cellebral and medulla oblongata

cerebellum is responsible for coordinating impulses, posture and balance, motor
coordination and muscle tone

medulla oblongata controls heartbeat, blood pressure breathing rate, coughing and
sneezing

a) i) What is reflex action?

an automatic response to an external stimulus e. g. sneezing or Withdrawing hand from a
hot object

ii) Describe a reflex action that will lead to the Withdrawal of a hand from a hot object

Receptors in the skin respond to stimuli. Arestimulated

an impulse is transmitted through the sensory neurone, across a synapse to the central
nervous system (White matter), through the relay neurone into grey matter, then to the
motor neurone and finally to the effect muscle which contracts

the hand is then withdrawn

iii) Explain how an impulse is transmitted across the synapse (gap)

impulse initiates release of transmitter substance acetylcholine at the end of the sensory
neurone

acetylcholine diffuses across the synapse and generates an impulse in the next neurone

ii) Briefly describe the transmission of a nervous impulse across a neuro-muscular
junction

impulse arrives at synoptic knob and causes vesicle to move to the pre-synaptic
membrane

vesicle discharges transmitter substance into synaptic cleft

transmitter substance/acetylcholine diffuses across the cleft and attaches to post-synaptic
membrane

the membrane is depolarized, generating the action potential

iii) What are the functions of a synapse?

allows transmission of nerve impulses from neurone to neurone

ensures nerve impulses travel in only one direction W

in the brain they store information/memory

b) i) What is a conditioned reflex?

A response caused by a unilateral stimulus (associated stimulus) which substitutes the
normal stimulus

ii) Explain a conditioned reflex

it is automatic

it involves the spinal cord

it is usually learned e. g. writing, cycling, dancing

it involves the interaction of highly specialized centers of the brain with a large number
of neurone necessary to bring about conditioning

example is experiments carried out by Pavlov using dogs

iii) Compare a simple reflex action with a conditioned reflex

c) i) What are endocrine glands?

ductless glands that produce hormones in animals

hormones are chemical substances which help to coordinate the functions of the body

ii) State the functions of hormones in animals

regulate growth and development

control behavior during breeding

proper functioning of cells

regulate metabolic activities

iii) Name the main endocrine glands, their secretions and functions in the human body

Gland: Thyroid

Hormone:

Thyroxine

Function:

increases the rate of metabolism

Gland: Parathyroid

Hormone:

Parathyroid hormone

Function:

regulates calcium and phosphate levels

Gland: Pituitary

Hormone:

growth hormone

Function:

regulates growth of the body

gonadotrophic hormone

Function:

stimulates the growth of male and female organs

lactogenic hormone (prolactine)

Function:

stimulates secretion of milk after child birth

thyrotropic hormone( TSH)

Function:

proper functioning of thyroid glands/thyroxine production

adrenocorthicotropic hormone (ACTH)

Function:

stimulate release of adrenal cortex hormone

oxytocine hormone

Function:

regulates blood pressure

stimulates smooth muscles

stimulates contraction of uterus during child birth

aids flow of milk from mammary glands

follicle stimulating hormone (FSH)

Function:

causes maturition of egg in females

stimulates sperm production in male

Vasopressin (ADH) antidiuretic hormone

Function:

regulates water balance by kidney

Gland: adrenal

adrenaline (epinephrine hormone)

Function:

for emergency

prepares body to cope up with stress

aldosterone hormone

Function:

maintain balance of salt and water in blood

cortisone hormone

Function:

break down the stored proteins to amino acids

aids in the break down of adipose tissue

regulates sugar levels in the blood

prevents inflammation

sex hormone

Function:

supplements sex hormones produced by gonads

promotes development of sexual characteristics

Gland: Pancreas

Hormone:

insulin

Function:

regulates levels of sugar in blood

enables liver to store sugars

glucagon

Function:

regulates levels of sugar in blood

Gland: ovaries

Hormone:

oestrogen
Function:

causes secondary sexual characteristics in female

prepares the uterus for pregnancy

progesterone
Function:

growth of mucus lining of uterus

maintains the uterus during pregnancy

Gland:testes

Hormone:

androgen testosterone

Function:

causes secondary sexual characteristics in male

Gland: stomach cells

Hormone:

gastrin

Function:

stimulates release of gastric juice

Gland:intestinal cells

Hormone:

secretin

Function:

stimulates secretion of pancreatic juice

iv) Give the differences between nervous and endocrine (hormonal) communication

nervous

response confined to effector organs( localized target)

speed of response is rapid

nervous impulse through nerve/nerve cells/neurons

duration of response is short

speed of transmission is rapid

transmission is electrical

hormonal(endocrine)

response more widespread (various targets)

response less rapid

hormones transferred through blood

persistent for long

speed of transmission is slower

transmission is chemical

v) State the effects of over secretion and under secretion of adrenaline and thyroxine in
humans

g) i) Define the following terms

Drug

a substance that causes a change in body function

Drug abuse

indiscriminate use of drugs without minding their side effects

misuse or wrong use of drugs

ii) State the types of drugs, examples and side effects

Sedatives

also called depressant

a drug that decreases the action of the central nervous system

reduce anxiety, and tension, induce sleep and act as muscle relaxants

when abused they cause withdrawal effects such as anxiety, delirium and death

includes barbiturates, other sedatives, tranquilizers and alcohol

Pain-killers

suppress centers of pain in the brain

Hallucinogens

given to people with hallucination or mentally ill patients to calm then down

when abused they lead to a feeling of confusion, agitation, depression and violent
behavior that can lead to murder or suicide

examples include valium, LSD, bhang, narcotics and cannabis

Stimulants

drugs that temporarily increase the action of the central nervous system

they create a feeling of alertness, wakefulness, a sense of self confidence and well being

used to decrease fatigue and mild depression

when abused they cause feelings of persecution, hallucination and addiction

include amphetamines, cocaine, caffeine, miraa and nicotine

iii) State the general effects of drug abuse on human health

damage to body organs e. g. liver cirrhosis

drug addiction

impaired judgment resulting in clumsiness

socio-economic problems e. g. crime, loss of jobs, divorce, prostitution, HIV/AIDS

may cause poor health

h) i) List the special sense organs in mammals and the major function of each

– Eye for sight

– Ear for hearing and balance

– Nose for smell

– Skin for touch, temperature detection, pain detection

iii) How is the human eye adapted to its function?

conjunctiva is thin/transparent/tough to allow light to pass through/to protect the eye
Sclerotic layer is made up of (collagen) fibers/fibrous. It maintains shape of the
eyeball/protects the eye

cornea is transparent/curved thus refracts light rays/allows light to pass through

Choroid is a layer of tissue with black pigment/dark pigment. Prevents internal reflection
of light in the eye/contains blood vessels that supply oxygen/nutrients/remove
(metabolic) wastes from the eye

retina has cones/rods for bright colour vision/low light vision

yellow spot has a high concentration of cones for accurate vision/visual acuity

Blind spot has no cones and rods. Place where optic nerve leaves/enters the eye

optic nerve has (sensory) nerve fibers for transmission of impulses to the brain (for
interpretation)

Lens is biconvex/made up of elastic material/transparent. Adjust focus on far or near
objects allow light to pass through/for refraction of light rays

ciliary body is made up of muscle fibers glandular which contract/relax to change shape

suspensory ligaments are inelastic to hold lens in position/attach it to ciliary body

iris(is the coloured part of the eye it) has radial and circular muscles which control size of
pupil

pupil is the small hole at the centre of iris through which light passes into the eye

aqueous humor is a fluid through which oxygen/nutrients pass to the
comea/lens/maintains shape of the eyeball/refracts light rays

vitreous humor is a fluid which maintains shape of eye/refracts light rays

iii) What is accommodation of the eye?

ability of the eye to adjust to bring an image from a near or far object into sharp focus on
the retina

iv) Explain how an eye viewing a near object adjusts to viewing a far object

ciliary muscles relax

suspensory ligaments become taut/tight

lens decreases curvature/becomes thinner

radial muscles relax

circular muscles contract

size of pupil decreases to reduce amount of light

v) What changes occur in the eye if it changes from observing an object at a distance to one
at a closer range?

– ciliary muscles contract

– Tension in suspensory ligaments reduces/relaxes slackens

– Lens bulges/thickens/increases curvature

– Radial muscles contract

– Circular muscles relax

– Size of pupil becomes large to allow in more light.

viii) State the changes which would take place in the eye if a person in a dark room
had lights switched on

circular muscles contract and radial muscles relax

pupil becomes small to allow less light into the eye

ix) Explain how the eye forms an image

the mammalian eye works like a camera

light rays enter the cornea pass through the pupil, aqueous humor, lens and vireous humor

light rays are refracted by the aqueous and humor and lenses

finally light falls on the retina to form an image

the image is real and invened and smaller than object, back to front/reversed

Retina forms a fine image when light rays reach it.

x) Name the defects of the eye and state how they can be corrected

Short sight (Myopia)

eye cannot focus on far objects

image is formed in front of the retina because light rays converge in front of retina

the lens is too thick, curve and eyeball too long

corrected by wearing concave/biconcave/lenses

these lenses diverge light rays onto retina

Long sight (Hypermetropia)

eye lenses are unable to focus because they are flat, thin and weak hence unable to focus
image on the retina

they are unable to accommodate/change the focal length

near image is formed behind the retina but a distant one is correctly focused on the retina

corrected by wearing convex/biconvex/converging lenses

Presbyopia

occurs in old age hence called old sight

caused due to loss of elasticity of lenses, weakness of ciliary muscles hence lack of focus
of light rays

this causes long sight

corrected by wearing biconvex/convex/converging lenses

Squinting

eyeballs are uncoordinated/do not turn at the same time

eye muscles move in different directions

this makes accommodation and focusing difficult

corrected through surgery

Astigmatism

surface of cornea is uneven

leads to weak focus of light raise on retina

corrected by using cylindrical lenses/lenses with combined curvature

xi) State the advantages of having two eyes in human beings

stereoscopic vision

gives a wider angle of binocular vision

if one is damaged human is not blinded

i) What are the functions of the human ear?

hearing

maintaining body balance and posture

iv) How are the structures of the human ear suited to perform the function of
hearing?

Pinna is funnel shaped allows collection of sound waves and channels them down the
auditory canal/auditory mateus

auditory canal is a tube that concentrates and directs sound waves to tympanic
membrane/tympanum/eardrum

Eardrum is thin and tight. It sets into vibration/vibrates/converts sound waves into
vibrations

the vibrations are transmitted to the ear ossicles/malleus, incus and stapes that amplify the
sound vibrations

the vibrations are then transmitted to the fennestra ovalis/oval window

Oval window is a membrane which amplifies/transmits vibrations to the fluids
(perilymph and endolymph) then to cochlea.

The cochlea is coiled to occupy a small space and accommodate a large number of
sensory cells

The sensory cells/hairs (in the cochlea) are set into vibrations/stimulated producing nerve

impulses in the auditory nerve

Impulses in the auditory nerve are transmitted to the brain for interpretation for hearing

Eustachian tube connects the inner ear to the throat. It equalizes air pressure in the middle
ear with the atmospheric air pressure (in outer ear)

Fennestra rotundus/round window dissipates/discharges/discards vibrations from inner
ear to middle ear

iii) Explain how the structure of the human ear performs the function of balancing

there are three semi-circular canals/utriculus/succulus/vestibular apparatus arranged in
planes at right angles to each other

at the end of each canal is a swelling called ampulla which contains receptors

the movement of the head causes movement of the fluid/endolymph in at least one canal

the fluid movement causes stimulation of the receptors/sensory hairs

sensory impulses are generated

the auditory nerve transmits the impulses to the brain for interpretation for the position of
body/posture/balance

iv) State what would happen if the auditory nerve was completely damaged

deafness

loss of body balance

impulse not transmitted to the brain

5. a) i) What is support?

to support is to carry part of the weight/mass of an organism

ii) What is locomotion?

progressive change in the position of an organism

iii) State the importance of support systems in living organisms

they provide a framework for the body of organisms and help to determine their shape

provide land animals with means for support to their weights against gravity

organs are attached to the skeleton for support and stability to avoid entanglement and
crushing each other

they protect very important and delicate organs whether inside or outside the body e. g.
eyes, heart

in large plants the rigid trunks of trees support the greater mass of leaves and fruits

iv) State the importance of locomotion in animals

in search of food

Search for mates

escaping predators

b) i) Name the tissues in higher plants that provide mechanical support

Sclerenchyma

collenchyma (not lignified)

xylem/tracheids and vessels

ii) State the importance of support in plants

exposing the surface area of leaf to sunlight for photosynthesis

ensure flowers are exposed to pollination agents

expose fruits and seeds to agents of dispersal

to resist breakages due to their own weight and that of other organisms

for proper transport and translocation of materials

iii) Name the types of plant stems

herbaceous e.g. shrubs

woody e. g. trees

weak stems in creepers, twining plants and plants bearing tendrils

iv) Name the tissues in plants that are strengthened with lignin

sclerenchyma

xylem vessels/tracheids/xylem

v) What makes young herbaceous plants remain upright?

turgidity

presence of collenchyma

vi) State the ways by which plants compensate for lack of ability to move from one place to
another

ability to pollinate

response to nastic and tropic movement

ability to exploit localized nutrients

ability to disperse seed or fruit propagation

c) i) Explain the Ways in which erect posture is maintained in a Weak herbaceous stem

– This is the function of turgidity and presence of collencyma

Cells take in water and become turgid

ii) Explain how support in plants is achieved

Turgor pressure due to absorption of water keeps cells firm hence hold herbaceous plants
upright

collenchyma and clerenchyma tissues are closely packed in stem and roots to provide
support

inelastic cuticle on epidermis is covered by a waxy layer hence keeping shape of plant
and setting inward pressure against turgid cells and this causes a force to hold plant
upright

xylem vessels and tracheids are lignified to provide support to stems, roots and leaves

climbing plants obtain mechanical support from other plants and objects

they have climbing structures like tendrils which hold on to other objects

d) i) Give the reasons why support is necessary in animals

for attachment of muscles

For attachment of other body organs

to protect delicate body organs

to maintain body shape/form

to enable movement/locomotion

ii) Why is movement necessary in animals?

enables animals to search for food

enables animals to search for shelter

enables animals to escape predators/harmful conditions

enables animals to Search for water

enables animals to search for mates

enables animals to search for breeding sites

e) i) Name the organ used for support by animals

– Skeleton

ii) Name the different types of skeletons in animals, giving an example of an animal for
each type of skeleton named

exoskeleton e.g. arthropoda (crab, insect)

endoskeleton e. g. chordata (cat, fish)

iii) State the difference between exoskeleton and endoskeleton

endoskeleton is a rigid framework covered by body tissues of an animal

exoskeleton is a rigid framework found on the surface of an animal

iv) State the advantages of having an exoskeleton

supports/protects delicate inner parts

water proof/prevents drying up of body

provided surface for muscle attachment

v) Explain the importance of having an endoskeleton

support the body

give body its shape

protect delicate organs e. g. skull, brain, ribs

used in locomotion e.g. bones serve as levers

red blood cells are formed in bone marrow

minerals are stored in bones e. g. calcium and phosphorus

f) i) Explain how a fish is adapted to living in Water

streamlined body for easy movement in water

swim bladder controls depth of swimming

fins for movement, balance, direction and stability,

gills for gaseous exchange in water

presence of lateral line to sense vibrations

scales provide protection .

colour which offers camouflage against predators

ii) Explain how a finned fish is adapted, to locomotion in Water

streamlined body to reduce resistance/friction )to swim smoothly)

the vertebral column consists of a series of vertebrae held together loosely so that it is
flexible

myotomes/muscles associated with vertebral column produce movement

the sideways and backwards thrust of the tail and body against water results in resistance
of water pushing the fish sideways and forwards in a direction opposed to thrust

heat not flexible so as to maintain forward thrust

presence of fins help in propulsion/balance/paired fins (pectoral and pelvic) for
controlling pitch and slow down movement/unpaired fins (dorsal, ventral, anal) for
yawing and rolling (caudal) for swimming/propulsion and steering/change of direction

presence of swim bladder to make fish buoyant

scales tip towards the back to provide smooth surface

body covered with mucus to reduce friction

flattened surface for easy floating

g) i) Name the main parts of the vertebral column giving the types of bones found in each
part

Axial skeleton

forms the main axis of the body

formed by the skull, sternum, ribs and vertebrae

Appendicular skeleton

composed of limbs and girdles

the forelimbs are connected to the trunk by the pectoral girdles (shoulder bones)

hind limbs are connected to the pelvic girdle (hips)

bones are scapular, clavicle, humerus, ulna, femur, tibia, fibula, metacarpals, carpals,
tarsals, metatarsals, phalanges, ilium, ischium and pubis

ii) What are the vertebrae?

bones of the vertebral column

iii) State the functions of the vertebral column

gives flexibility

absorbs shock

protects spinal cord

supports weight of body

provide surface for muscle attachment

between the vertebrae are soft discs which offer cushioning called interverterbral discs

iv) State the general characteristics of vertebrae

have solid structure called centrum to support weight of body

has transverse process lateral to centrum for muscle attachment

neural spine is dorsal to centrum and provides surface area for muscle attachment

neural canal a passage for spinal cord and offers protection to it

has facets for articulation with other vertebrae

neural arch encloses neural canal

v) Name the bones of the vertebral column

– Cervical vertebra

— Thoracic vertebra

– Lumbar vertebra

– Sacral vertebra

– Caudal vertebra

vi) Describe how the various vertebrae are adapted to their functions

Bone:

skull

Structure:

cranium and jaw bones

made of several bones joined together

large box called cranium and smaller paired boxes for eyes, ears, nose, jaw

has large hole called foramen magnum for passage of spinal cord

Function:

attachment of jaws

protect brain and other delicate parts

Bone:

cervical region Atlas (first cervical)

Structure:

ring shaped

no centrum

broad flat transverse processes

vertebraterial canal for passage of vertebra artery

facet for articulation of condyles of skull

Function:

protects the spinal cord

attachment of muscles

allow nodding of head

Bone:

axis (second cervical)

Structure:

adontoid peg projects from centrum

large flattened neural spine

vertebraterial canal

small transverse process

Function:

allows the head to rotate

protects the spinal cord

provides surface for muscle attachment

Bone:

cervical (others)

Structure:

short neural spine

branched transverse process for neck muscles

vertebraterial canal

wide neural canal

Function:

supports weight of the head

protects the spinal cord

neck muscle attachment

Bone:

Thoracid

Structure:

long backwards pointing neural spine

transverse process that points sideways

facets for articulation of ribs

notch for spinal nerves to pass through

Function:

forms ribcage

articulation with one end of rib

protects the spinal cord

muscle attachment

Bone:

lumbar

Structure:

short neural spine

long transverse process towards abdomen

large centrum

extra processes e.g prezygapophysis, hypapophysis,
anapophysis,metapophysis

Function:

protects organs of the abdomen

supports the upper part of the body

protects the spinal cord

muscle attachment

Bone:

sacral

Structure:

fused bones to form sacrum

well developed transverse processes of first vertebra

vertebraterial canal

short neural spine

Function:

protects the alimentary canal

attachment of hip girdle

protects the spinal cord

muscle attachment

Bone:

Rib

Structure:

long

flattened

attached to sternum from front

Function:

protects internal organs

muscle attachment

vii) Describe the bones that form the appendicular skeleton

Bone:

pectoral girdle (scapular shoulder bone)

Structure:

broad i,e flattened blade

glenoid cavity to articulate with humerous

metacronium/acromion for muscle attachment

hard to provide support

socket with cartilage/smooth surface to reduce friction

Function:

support muscle attachment

articulate with humerous

Bone:

Humerous

Structure:

long shaft for muscle attachment

round head to articulate with glenoid cavity

trachlea for articulation with ulna

olecranon fosa to prevent arm bending the other way

Function:

movement

muscle attachment

Bone:

Ulna and radius

Structure:

ulna longer and on side of little finger

has sigmoid notch and olecranon process to form hinge joint with humerous

radius is smaller and lies along thumb side and does not join ulna

allows articulation with wrist bone

Function:

movement

muscle attachment

Bone:

pelvic girdle (hip bone)

Structure:

composed of three fused bones ilium, ischium, pubis

upper end fused to sacrum

lower end has acetabalum for articulation with femur

has abturator

Function:

movement

muscle attachment

support

absorbs pressure exerted by ground when animals move

Bone:

Femur

Structure:

rounded head to fit in acetabalum of pelvis

projections called trochanter for attachment of thigh muscles

condyles at lower end for articulation with tibi

patella that covers knee and prevent leg from bending backwards

Function:

movement

muscle attachment

Bone:

tibia and fibula

Structure:

tibia is longer than fibula

tibia is outer bone and fibula is inner bone

tibia lies on the side of large toe

fibula is fussed to tibia on (outer side)

Function:

movement

muscle attachment

6. a) What is a joint?

the point where bones meet

ii) State the functions of joints

provide a point of articulation between bones

iii) Name the main types of joints

immovable joints e.g. skull, pelvic girdles and sacrum

slightly movable joints e. g. between vertebrae

Freely movable joints e. g. knee, elbow

iv) Give the features of movable joints

ends of bones covered with articular cartilage

ends bound by capsules of ligaments

have joint cavity filled with lubricating fluid called synovial fluid secreted by synovial
membrane

they are called synovial joints

b) Describe the synovial joints

iv) Ball and socket

allow movement in all planes /directions i.e. 360°

rounded end of bone fits into a rounded/cavity in another bone

e.g. shoulder joint and hip joint

v) Hinge joint

convex surface of one bone fits into the concave surface of another bone

this allows movement in only one plane/direction 180°

e.g. elbow joint and knee joint

vi) Pivot joint

allows rotation e. g. where atlas pivots on olecranon process of axis

c) i) What is synovial fluid?

lubricating fluid produced by synovial membrane at movable joints

ii) State the functions of synovial fluid

absorbs shock

reduces friction/ gives lubrication

nourishment

distributes pressure

d) Explain the following terms

v) Ligament

connective tissue joining one bone to another

vi) Cartilage

supporting soft tissue found at joints

they cushion the bones and absorb shock

vii) Tendon

tissue that connects muscle to bones

7. Muscles

e) i) What is a muscle?

fleshy part of body

composed of long cells enclosed in a sheath

specialized cells capable of contracting

ii) State the functions of muscles

cover the skeleton

provide shape

contract and relax to enable body to move

f) Describe the structure and function of various types of muscles

i) skeletal muscles

also called voluntary/striated/stripped muscles

they are attached to skeleton

they consist of striated, multinucleated, ling fibers and are cylindrical shaped

found on legs, arms, eyes, neck where they cause movement

ii) Involuntary muscles

also called smooth/visceral/unstriated/unstripped

their movement is not controlled by the will

they are unstriated, nucleated, short fibred and spindle shaped

are found in alimentary canal, blood vessels, secretory glands, other tubular visceral

organs, bladder, uterus, urinary tract, reproductive system, respiratory tract, ciliary body
iris

iii) Cardiac muscles

also called myocardium

found in the Walls of the heart

are not under control of the will

composed of long cylindrical cells with special junctions

myogenic i.e. generate their own contraction

they are not fatigued

their function is contraction of the heart to pump blood

g) Explain how muscles cause movement of the human arm

the muscles which bring about these movements are called biceps and triceps

biceps are attached to scapula and radius for bending

triceps are attached to scapula, humerus and ulna for stretching

when the biceps contracts, it pulls the radius (forearm) and the hand bends

the triceps relaxes at the same time

when the triceps contracts and biceps relaxes(extends) the arm is stretched

biceps flexes the arm (flexor) and triceps extend(extensor muscle) the arm

h) i) State the structural differences between skeletal muscles e.g. biceps and smooth
muscles e.g. gut muscle

skeletal (biceps)

multi nucleated

striated/stripped

long muscle fibers

block/cylindrical

smooth muscles

un nucleated

un striated

short muscle fibers

spindle shaped

ii) Name the cartilage found between the bones of the vertebral column

intervebral disc

iv) What are the functions of the cartilage named in (d) ii) above

acts as a cushion/absorbs shock

reduces friction

flexibility of vertebral column

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