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QSSC Unit Biology IAS Practice Test

Biology Foundation Cluster A Form 1 1

1

The diagram below shows chloroplast structure.

Which of the following is correct about structure Z?

A. Contains pigments for dark reactions.

B. Site of water splitting.

C. Contains enzymes for Calvin cycle.

D. Site of light reactions.

2

Which of the following reactions take place in part Y ?

A. Glycerol - 3 phosphate is changed to glyceraldehyde phosphate

B. Carbon dioxide fixation.

C. Releasing of oxygen.

D. CO2 is formed.


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3

Below is a cross section of a plant leaf.

X

The main reason why structure X is responsible for the process of photosynthesis?

A. The presence of large amount of chloroplast.

B. It has a wide spaces between its cells.

C. It is a transparent substance.

D. It has a waxy substance.

4

Below is a cross section of a plant leaf.

1

What is the function of the leaf part labeled as number 1?

A. transport water

B. transport sugar

C. reduce water loss

D. increase water evaporation


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5

Which of the following involves a release of energy?

A. ATP is changed to ADP.

B. AMP is changed to ADP.

C. AMP is changed to ATP.

D. ADP is changed to ATP.

6

What is the final acceptor of electrons in the non-cyclic electron pathway?

A. PS I

B. PS II

C. H2O

D. NADP+

7

During the light dependent reactions in the thylakoid membrane ATP is produced. What is

the other product?

A. FADH2.

B. NADPH.

C. NADP.

D. NADH.


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8

What is the role of NADPH and ATP in photosynthesis?

A. to split water.

B. to move electrons.

C. to regroup photosystems.

D. to convert glycerate 3 phosphate to glyceraldehyde 3 phosphate.

9

Why does the rate of photosynthesis decrease above the optimal temperature?

A. production of NADPH will increase .

B. production of ATP will increase

C. enzymes become more active.

D. enzymes have denatured.


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10

The diagram below is the cross section of a stem.

What is the function of structure X?

A. Transport sap (sugar).

B. Transport water.

C. Transpiration.

D. Protection.


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12

The diagram below is the cross section of a stem.

Where does new growth take place?

A. 1

B. 2

C. 3

D. 4

13

Which factor has the greatest effect on the flow of water in large plants?

A. root pressure.

B. transpiration pull.

C. capillary movement.

D. osmosis.

14

Which of the following sentences describe symplast pathway in the root tissues?

A. Water moves through the cytoplasm of the cells.

B. Water moves on the cell wall of the cell.

C. Water moves through the sieve tubes.

D. Water moves through companion cell.


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15

Which of the following sentences describe the transpiration process :

A. water loss through stomata.

B. oxygen uptake through stomata.

C. oxygen release through stomata

D. water absorption through stomata

16

Which of the following factor is inversely proportional to the transpiration rate?

A. air flow.

B. humidity.

C. temperature.

D. light intensity.

17

Which of the following factors has the main effect on translocation in large plants?

A. adhesive force.

B. Osmosis.

C. active transport.

D. capillary movement.


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18

The picture below shows the structures inside a chloroplast.

a. What are the types of pigments found inside structure A?

b. How can the structure ( A ) inside the chloroplasts adapted for collecting light energy?

19

The following diagram shows a section through a leaf. Identify the tissue where most of the

photosynthesis occurs.


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20

In plants , what happened if :

a) The waxy cuticle is absent.

b) Both palisade and spongy layers have exchanged places in the leaf structure.

21

The equation below represents an important process in the chloroplasts:

H2O 2H+ + 1/2 O2 + 2e-

a) What is the name of this process?

b) What happens to the hydrogen ion and oxygen molecule produced from this process?


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22

The following diagram summarizes the stages of photosynthesis.

a. State the site of light-independent stage in the plant?

b. What is the name of compounds X and Y?

c. What would happen if hydrogen carriers are found in low quantities in the first stage?

Light-dependent

stage

Light-independent

stage


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23

Explain the relationship between decreasing the level of water and the rate of

photosynthesis?

24

The following graph represents the effect of light intensity on the rate of photosynthesis.

Light Intensity

Based on the graph, explain how light intensity affects the rate of photosynthesis at phase 1

and phase 2.


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25

Can this plant depend mainly on diffusion in substances transport inside it ?

Mention the reasons for your answer

26

Give a reason why A and B are located in the center of the plant root, where as in the same

plant, this distribution will change in the stem.


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27

What would happen if the structure A is not thickened with lignin?


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28

Related to the figure

Describe two functions of strip A in the root of a plant?

29

The figure shows the pathways taken by water across the cells in the root of a plant

Identify 2 pathways by which water passes across the root.


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30

The diagram below shows an apparatus used in an investigation. The cylinders were set up

and left in the same conditions for 24 hours.

The drop in the level of water in the

cylinders is taken as a measure of the

rate of transpiration.

a) Complete the following Table

i. Which plant has the greatest

transpiration rate?

ii. What conclusion can be drawn

about the rate of transpiration in the

plants?


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31

An investigation was carried out to study the effect of wind speed on the rate of

transpiration of a leafy plant as show below.

What will happen if the speed of fan increases? Why?

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