Candidate
Candidate Name ____________________
TIME 2 hours
INSTRUCTIONS TO CANDIDATES
Write your name, Centre number and candidate number in the
spaces at the top of this page and on all
separate answer paper used.
Section AAnswer all questions.
Write your answers in the spaces provided on the question
paper.
Section BAnswer any three questions.
Write your answers on the separate answer paper provided.
At the end of the examination,
1 fasten the separate answer paper securely to the question
paper;
2 enter the numbers of the Section B questions you have answered
in the left hand column of the
' grid below.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of
each
question or part question.
You are advised to spend no longer than 45 minutes on Section
A.
Section A
Answer all questions. Write your answers in the spaces provided
on the question paper.1 Fig. 1 shows the stages in the large scale
treatment of river water for drinking. The stages are labelled A to
F.
A
B
C
D
E
F
Fig. 1(a) Name Stage D.
...............................................................
[1](b) Which letter represents the stage at which ultra-violet
light kills bacteria? . [1]
(c) Which chemical may be added at C to speed up sedimentation?
. [1](d) Which chemical is added at E to destroy any remaining
bacteria and viruses?
..
[1]
(e) Why are the storage tanks at F covered?
. [1](f) A chemical which helps reduce tooth decay may be added
to the water.State the name of this chemical [1]5096/1 S97
3
2 Fig. 2 shows a generalised animal cell as seen through the
electron microscope
Fig. 2
(a) Name, on Fig. 2, the structures labelled A and B.
[2](b) State the parts of the cell responsible for the following
processes:(i) forming most of the cell's ATP; ..
(ii) forming proteins from amino acids; ........(iii) storing
genetic information; ..(iv) controlling movement of materials in
and out of the cell.
. [4]43 Fig. 3 shows a section through a molar tooth.
Fig. 3
(a) Label the parts A, B and C on Fig. 3.
[3](b) Name the part of the tooth where the nerve is found.
[1]
(c) The surface of a tooth is very hard but can be damaged by
acids.
Explain the link between a high sugar diet and increased tooth
decay. .
[2]5096/1 S97Fig. 4 shows some of the changes in lung volume in
a person during different depths of breathing.
Fig. 4
(a) At which point, A, B, C or D, are the following muscles
fully contracted?
(i) external intercostal muscles; ...
(ii) internal intercostal muscles; ....
(iii) diaphragm muscle. ................... [3](b) In this
person, what are the actual volumes of the:
(i) vital capacity? ................... dm3(ii) residual volume?
................... dm3(iii) tidal volume? ...................
dm3[3]5096/1 S976
5Fig. 5 shows two nuclei from a male, dividing, one by mitosis
and one by meiosis. Only the sex chromosomes X and Y are shown.
Fig. 5
(a) On Fig. 5, draw in the sex chromosomes as they would appear
in nuclei A, B and C. [3](b) What type of cells would contain
nuclei B and C? [1](c) Which type of division, mitosis or meiosis,
is responsible for:(i) the growth of an organism; .. (ii) variation
in a population? .[2]5096/1 S976Fig. 6 shows how blood sugar level
is controlled.
Fig. 6(a) Name organs X and Y.
X .
Y.[1]
(b) Name hormones A and B.
A .
B . [2](c) Hormone C is secreted in emergencies. Name hormone C
[1]8
7 Fig. 7 shows the life cycle of the house fly.
Fig. 7(a) State two reasons, from the diagram, why the adult
house fly, A, is classified as an insect.1 2. [2] (b) Name stage C
[1](c) State two ways in which the pupa of the mosquito differs
from D, the pupa of the housefly.
1.
2. ..[2]
10Section B
Answer three questions.
Write your answers on separate answer paper provided
8(a) (i) Define diffusion
[2]
(ii) How does active transport defer from diffusion?
[3]
(b) List the end products of digestion of
(i) fats,
(ii) carbohydrates
and state one important use of each in the body.
[4]
(c) Vili are important in both the small intestine and the
placenta.
(i) What is a villus?
[2]
(ii) Describe the function of vili in
1. the small intestine,
2. the placenta.
[9]
9(a) Define good health.
[2]
(b) With references to AIDS and lung cancer, explain what meant
by
(i) a transmissible disease
[5]
(ii) a non-transmissible disease
[5]
In some cities, homeless children sleep in the under ground
sewerages pipes (sewers) at night beg in the streets for food by
day. Discuss the health hazards which could result from
(i) sleeping in sewers,
(ii) begging for food.
[8]
10 (a) explain why green plants are known as primary
producers.
[6]
(b) (i) Green vegetables are an important part of the balance
diet. List three nutrients that they
provide.
[3]
(iii) why is it important to cook green vegetables but not to
over cook them?
[3]
(c) State four functions of water in the body.
[4]
(d) (i) State two ways in which the body might lose much
water.
[2]
(iii) State two harmful effects on the body of losing too much
water.
[2]
11
(a) Fig. 8 shows a kidney tubule.
Fig. 8
(i) Give reasons why the blood pressure is high at A.
(ii) Why is it an advantage for the blood to flow slowly between
B and C?(iii) List three substances present at D in the tubule of
healthy person.(b) How is oxygen carried by the blood?
(c) Explain how each of the following cause the blood to carry
less oxygen,
(i) Plasmodium (the malarial parasite),
(ii) Carbon monoxide.
(a) State how a neurone differs from a nerve.
(b) You touch hot object and immediately take your hand
away.
(i) Why is this called a reflects action?
(ii) Describe how this reflex enables you to take your hand away
so quickly.
(c) How is the heart beat affected by
(i) the nervous system,
(ii) hormones?
(d) Explain why is it dangerous for a person to drink alcohol
before driving a vehicle.
River water
River water
Storage in open reservoir
sedimentation
Storage in open reservoir
A
B
nucleus
ribosome
A
B
C
Hormone A released
From organ X
Glucose converted
To glycogen in
Organ Y
falls
level
normal blood
sugar level
level
rises
Glucose converted
To glycogen in
Organ Y
Hormone B released
From organ X
Rise in blood sugar
Detected by organ X
Fall in blood sugar
Level detected by
Organ X
level
falls
normal blood
sugar level
level
rises