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SCIENCE PRACTICE QUESTIONS

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PHOTOSYNTHESIS

1.

To test for starch in a green leaf, it is usually boiled to

A.

isolate the starch.

B.

kill the leaf.

C.

make the leaf soft.

D.

extract the chlorophyll.

2.

When a green leaf is placed in a test tube containing ethanol and heated over a water bath the leaf

A.

becomes soft

B.

changes colour to brown

C.

changes colour to blue-black

D.

is decolorized

3.

Chlorophyll helps plants absorb energy from the sun as they undergo the process of photosynthesis. It is located in a structure called

A.

chloroplast.

B.

mitochondrion.

C.

vacuole.

D.

nucleus.

4.

Plants lose water through a process called

A.

photosynthesis

B.

fertilization

C.

transpiration

D.

respiration

E.
evaporation

5.

Photosynthesis in plants requires chlorophyll, sunlight, water and

A.

oxygen

B.

carbon dioxide

C.

steam

D.

hydrogen

E.
nitrogen

6.

In an experiment in which a variegated leaf is used, which of the following is proved to be necessary for photosynthesis?

A.

Carbon dioxide

B.

Light

C.

Chlorophyll

D.

Water

E.
Oxygen

7.

Which of the following environmental factors can cause the fastest rate of water loss from leaf surfaces?

A.

High humidity

B.

Wet wing

C.

Still air

D.

Low temperature

E.

Dry air

8.

Photosynthesis occurs only in green plants because they

A.

absorb water

B.

are found in the tropics

C.

are very active

D.

contain chlorophyll

E.
take in carbon dioxide

9.

Which of the following substances is necessary for the formation of food in plants?

A.

Carbon dioxide

B.

Nitrogen

C.

Oxygen

D.

Starch

E.

Sugar

10.

The equation Carbon (IV) oxide + water ChlorophyllLight Glucose + Oxygen, represents

A.

Breathing

B.

Diffusion

C.

Photosynthesis

D.

Respiration

E.

Transpiration

11.

Plants manufacture their food using

I. carbon dioxide
II. oxygen
III. light
IV. chlorophyll

A.

I only

B.

II only

C.

I and II only

D.

I, III and IV only

E.

I, II, III and IV

12.

The by-product of photosynthesis is

A.

carbon dioxide.

B.

starch.

C.

oxygen.

D.

water.

13.

Which of the following gases is given out during photosynthesis?

A.

Carbon dioxide

B.

Carbon monoxide

C.

Nitrogen

D.

Oxygen

14.

Food substances are transported from the leaves to various parts of a plant through the

A.

cambium.

B.

epidermis.

C.

phloem.

D.

xylem.

15.

The substance that enables green plants to trap sunlight for the manufacture of food is

A.

chlorophyll.

B.

chloroplast.

C.

phloem.

D.

xylem.

16.

Water is absorbed by roots in plants and transported to the leaves through the

A.

chlorophyll.

B.

phloem.

C.

stomata.

D.

xylem.

17.

The food manufactured by a plant is distributed to all parts of the plant through the

A.

chlorophyll.

B.

phloem.

C.

stomata.

D.

Xylem.

18.

The process by which water vapour moves through the stomata of leaves into the atmosphere is known as

A.

absorption.

B.

diffusion.

C.

osmosis.

D.

transpiration.

19.

The presence of chlorophyll in green plants is a necessary condition for photosynthesis because it

A.

absorbs oxygen.

B.

absorbs solar energy.

C.

produces carbon dioxide.

D.

produces water vapour.

20.

When a green leaf is placed in a test tube containing ethanol and heated over a water bath the leaf

A.

becomes soft

B.

changes colour to brown

C.

changes colour to blue-black

D.

is decolorized

21.

Gases enter and leave the leaf of a plant through the

A.

mesophyll cells.

B.

stomata.

C.

pith.

D.

palisade cells.

22.

Photosynthesis is important to living organisms because it produces

A.

glucose and oxygen.

B.

glucose and carbon dioxide.

C.

oxygen and carbon dioxide

D.

water and carbon dioxide.

23.

Which of the following is used by plants to make its food?

A.

carbon monoxide

B.

oxygen

C.

carbon dioxide

D.

hydrogen

E.
nitrogen

24.

Photosynthesis occurs only in green plants because they

A.

absorb water

B.

are found in the tropics

C.

are very active

D.

contain chlorophyll

E.
take in carbon dioxide

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