1 Grade 9 5090 / 22/O/N/2012/GAAS

Section A

Answer all questions in this section.

Write your answers in the spaces provided.

1. Fig. 3.1 shows human blood cells.

a) (i) Name the blood cells P, Q and R.

P………………………………………….

Q………………………………………….

R…………………………………………. [2]

(ii) Describe the functions of cells Q and R.

Q

…………………………………………………………………………………………………

…………………………………………………………………………………………………

……………………………………………………………………………………………[2]

R

…………………………………………………………………………………………………

…………………………………………………………………………………………………

……………………………………………………………………………………………[2]

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R

P

Q

b) Explain how the structure P is adapted for its function.

………………………………………………………………………………………………

………………………………………………………………………………………………

………………………………………………………………………………………………

……………………………………………………………….

………………………………………………………………………………………………

…………………..……[4]

[Total: 10]

2. Figure 2.1 shows a section through an eye of a person who is focusing on a distant object.

Fig 2.1

a) Name the structures labeled A to D

A……………………………………………

B……………………………………………

C……………………………………………

D…………………………………………… [4]

b) On Fig. 2.1, continue the light rays into the eye to show how a focused image is

produced on the retina. [2]

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Lens

CD

Light rays

When the person then focuses on a book the lens of the eye changes its shape.

c) (i) Choose the lens, A to D in Fig. 2.2, which most closely resembles the

appearance of the lens in the eye when focused on the book.

Fig. 2.2 Lens………………………………. [1]

(ii) Describe what has happened in the eye to bring about this change in the shape

of the lens.

…………………………………………………………………………………………………

…………………………………………………………………………………………………

…………………………………………………………………………………………………

…………………………………………………………………………………………………

…………………………………………………………………………………………………

………………………………………………………………………………………………[4]

[Total: 11]

3. Fig.3.1 shows a part of a person’s nervous system that is involved in producing a

reflex action.

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Fig. 3.1

a) (i) Draw and label in Fig.3.1, a possible reflex arc of a reflex action involving the

withdrawal of the finger away from the bee sting.

Label: the neurons, the receptor and effector [5]

(ii) What is meant by a reflex action?

………………………………………………………………………………………………

………………………………………………………………………………………….[1]

b) Fig. 3.2 shows the vertical section through human brain. [4]

Fig 3.2

[Total: 10]

4. Fig 4.1 shows a flower of a dicotyledon.

Fig 4.1

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(i) Label on the diagram with the letters ,

B, C and

A control of balance and movement

B Control of breathing and heart beat

C Memory and intelligence

D Control body temperature

a) Name parts A and B shown on Fig 4.1.

A…………………………………………. B……………………………………… [1]

b) State the function of part C.

………………………………………………………………………………………………

………………………………………………………………………………………….[1]

c) (i) Define the term pollination.

………………………………………………………………………………………………

………………………………………………………………………………………….[1]

(ii) The flower shown in Fig.4.1 is insect pollinated. Describe how two features,

visible in Fig.4.1, would be different in a wind pollinated flower.

1……………………………………………………………………………………………

………………………………………………………………………………………………

2……………………………………………………………………………………………

……………………………………………………………………………………..….…[2]

d) (i) While visiting a new region of forest, a student found an unknown plant.

Hanging from it were some structures with bright red outer coverings. These

contained some soft fleshy tissue. In this tissue were many seeds with hard outer

coats.

Suggest, with reasons, how these seeds might be dispersed.

Method of dispersal:…………………………………………………………….

Reasons:

1.

………………………………………………………………………………………………

………………………………………………………………..………………………….

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2.

………………………………………………………………………………………………

…………………………………………………………………………………...……[3]

(ii) Suggest which conditions in the forest would allow these seeds to germinate

and grow into young plants.

Conditions to germinate …………………………………………………………………

Conditions to grow ………………………………………………………………..…[2]

[Total: 10]

5. Fig. 5.1 shows parts of the structure of a seed which is in the early stages of

germination.

a) On Fig. 5.1, label structures U, V and W. [3]

b) (i) Name the part of the seed which has been removed to show the structures

shown in Fig.5.1. State the function of the named part.

Part of the seed:………………………………………......

Function:

……………………………………………………………………………………………

………………………………………………………………………..…….[2]

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Fig. 5.2 shows the change in the amount of sugar in structure U during the four days

immediately after the start of germination.

c) In food tests carried out on similar seeds before germination, no sugar was

found in any part of the seed.

Describe and explain how the amount of sugar in structure U changes over the

first four days of germination.

……………………………………………………………………………………………

……………………………………………………………………………………………

………………………………………………………………………………………..[4]

[Total: 9]

Section B

Answer three questions

Question 8 is in the form of an Either / Or question. Only one part should be answered.

Write your answers on the separate answer paper provided.

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6. A person cuts his hand on a piece of glass that they are picking up from the ground.

a) Describe how the body’s defense mechanisms protect the person from infection. [8]

b) Explain how the person would know if the cut had damaged an artery [2]

[Total: 10]

7. a) Describe the events which occur from the moment a person accidentally

touches a very hot object to the moment the hand is lifted. [7]

b) Explain how the action of deliberately raising the arm differs from the

sequence of events describes in (a). [3]

[Total: 10]

Answer only Question 8 Either or Question Or.

8. Either

a) Explain how the heart functions as a pump and keeps blood flowing in only

one direction. [7]

a) Explain how the difference in the pressure of the blood in the pulmonary

artery and in the aorta is related to (i) the structure of the ventricles and (ii)

where the blood is going. [3]

[Total: 10]

Or

a) Define the term excretion [1]

b) What part is played in the excretion by lungs? [2]

c) Explain how a kidney machine helps a person whose kidneys have ceased to

function. [7]

[Total: 10]

9 Grade 9 5090 / 22/O/N/2012/GAAS

GOOD LUCK

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Grade 9 5090 / 22/O/N/2012/GAAS