Nutrition in Plants

27 Grade 9 Integrated Science questions on Nutrition in Plants, with worked marking schemes. 27 questions are available on this topic in full.

1. Question 1

   2 marks

   A student claimed that a plant kept in a well-lit room but supplied with no carbon dioxide would still make starch.

   (a) State whether the claim is correct.

   (b) Give a reason for your answer.

   (2 marks)

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2. Question 2

   3 marks

   Write down the word equation for photosynthesis and name the source of energy used in the process.

   (3 marks)

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3. Question 3

   1 mark

   Which tissue transports water absorbed by the roots up to the leaves for use in photosynthesis?

   A. Epidermis

   B. Xylem

   C. Phloem

   D. Cuticle

   (1 mark)

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4. Question 4

   1 mark

   A plant kept in darkness for several days will

   A. produce more food

   B. not be able to photosynthesise

   C. grow faster

   D. change colour to red

   (1 mark)

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5. Question 5

   4 marks

   Photosynthesis is the process by which green plants make their own food.

   (a) Write a word equation for the process of photosynthesis. (2 marks)

   (b) State two conditions necessary for photosynthesis to take place. (2 marks)

   (4 marks)

   Marking scheme

   (a) Carbon dioxide + water → (in the presence of sunlight and chlorophyll) glucose + oxygen. (b) Any two of: sunlight (light energy); chlorophyll; carbon dioxide; water; a suitable (warm) temperature.

6. Question 6

   1 mark

   The process by which green plants make their own food using sunlight is called

   A. transpiration

   B. photosynthesis

   C. respiration

   D. digestion

   (1 mark)

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7. Question 7

   4 marks

   Explain how each of the following adaptations helps a leaf carry out photosynthesis: (a) Broad, flat lamina (b) Presence of many stomata.

   (4 marks)

   Marking scheme

   (a) Broad flat lamina provides a large surface area to trap/absorb more light (1 mark) and for gaseous exchange (1 mark). (b) Many stomata allow entry of carbon dioxide into the leaf (1 mark) and exit of oxygen / allow gaseous exchange for photosynthesis (1 mark).

8. Question 8

   1 mark

   A learner observes that the underside of a green leaf has many tiny pores. Through which structures do these pores allow carbon dioxide to enter the leaf for photosynthesis?

   A. Root hairs

   B. Cuticle

   C. Xylem vessels

   D. Stomata

   (1 mark)

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9. Question 9

   4 marks

   A learner set up a green plant in sunlight to investigate photosynthesis.

   (a) Write the word equation for photosynthesis. (2 marks)

   (b) State two conditions, other than sunlight, that are necessary for photosynthesis to take place. (2 marks)

   (4 marks)

   Marking scheme

   (a) Carbon dioxide + Water → (in the presence of sunlight and chlorophyll) → Glucose + Oxygen. (2 marks: correct reactants and products) (b) Any two of: chlorophyll (in the chloroplasts); carbon dioxide; water; a suitable warm temperature (for the enzymes that control the reaction). (2 marks)

10. Question 10

    1 mark

    The raw materials needed for photosynthesis are

    A. oxygen and glucose

    B. carbon dioxide and water

    C. nitrogen and water

    D. carbon dioxide and oxygen

    (1 mark)

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11. Question 11

    1 mark

    The green pigment in leaves that absorbs light energy for photosynthesis is

    A. carotene

    B. chlorophyll

    C. haemoglobin

    D. melanin

    (1 mark)

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12. Question 12

    3 marks

    State three conditions (external factors) that are necessary for photosynthesis to take place in a green plant.

    (3 marks)

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13. Question 13

    1 mark

    A variegated leaf (partly green and partly white) is tested for starch. Which part of the leaf turns blue-black with iodine?

    A. The whole leaf

    B. Neither part

    C. Only the white part

    D. Only the green part

    (1 mark)

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14. Question 14

    3 marks

    State three factors that affect the rate of photosynthesis.

    (3 marks)

    Marking scheme

    1. Light intensity — more light increases the rate up to a point.

    2. Carbon dioxide concentration — higher CO₂ increases the rate.

    3. Temperature — higher temperature increases the rate up to an optimum, then it decreases.

15. Question 15

    1 mark

    A potted plant is placed in a dark cupboard for 48 hours before a starch test is carried out on its leaf. What is the purpose of keeping the plant in the dark?

    A. To kill the leaf cells before testing

    B. To destarch the leaf so any starch formed later comes from the experiment

    C. To increase the amount of chlorophyll

    D. To supply extra carbon dioxide

    (1 mark)

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16. Question 16

    1 mark

    Which of the following is the correct word equation for photosynthesis?

    A. Carbon dioxide + water → glucose + oxygen

    B. Oxygen + water → glucose + carbon dioxide

    C. Glucose + oxygen → carbon dioxide + water + energy

    D. Glucose + water → carbon dioxide + oxygen

    (1 mark)

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17. Question 17

    1 mark

    The products of photosynthesis are

    A. oxygen and nitrogen

    B. glucose and oxygen

    C. carbon dioxide and water

    D. starch and carbon dioxide

    (1 mark)

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18. Question 18

    1 mark

    When testing a leaf for starch, a learner boils the leaf in ethanol. Why is the leaf boiled in ethanol?

    A. To soften the leaf

    B. To add starch to the leaf

    C. To kill bacteria on the leaf

    D. To remove the green chlorophyll from the leaf

    (1 mark)

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19. Question 19

    5 marks

    (a) Write the word equation for the process of photosynthesis. (2 marks)

    (b) State two conditions necessary for photosynthesis to take place. (2 marks)

    (c) Name the green pigment that traps light energy for photosynthesis. (1 mark)

    (5 marks)

    Marking scheme

    (a) Carbon dioxide + Water --(light energy / chlorophyll)--> Glucose + Oxygen. (b) Any two of: presence of light (sunlight); presence of chlorophyll; supply of carbon dioxide; supply of water; a suitable (warm) temperature. (c) Chlorophyll.

20. Question 20

    1 mark

    In photosynthesis, the gas taken in from the atmosphere and the gas given out are respectively:

    A. Carbon dioxide in, oxygen out

    B. Nitrogen in, oxygen out

    C. Carbon dioxide in, nitrogen out

    D. Oxygen in, carbon dioxide out

    (1 mark)

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21. Question 21

    2 marks

    Write the word equation for photosynthesis.

    (2 marks)

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22. Question 22

    4 marks

    A learner set up an experiment to show that light is necessary for photosynthesis by covering part of a leaf with black paper (aluminium foil) while it was still on the plant in sunlight.

    (a) State the expected result when the leaf is later tested for starch.

    (b) Explain the result.

    (4 marks)

    Marking scheme

    (a) The covered part turns brown-yellow (no starch) while the uncovered part turns blue-black (starch present) (2 marks). (b) The uncovered part received light and carried out photosynthesis making starch, while the covered part received no light so photosynthesis did not occur and no starch was formed (2 marks).

23. Question 23

    1 mark

    Which green pigment in plant leaves traps light energy for photosynthesis?

    A. Chlorophyll

    B. Haemoglobin

    C. Carotene

    D. Melanin

    (1 mark)

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24. Question 24

    1 mark

    After a leaf is tested for starch using iodine solution, the parts that contained starch turn:

    A. Colourless

    B. Blue-black

    C. Brown-yellow

    D. Bright red

    (1 mark)

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25. Question 25

    1 mark

    Which part of the plant cell is the main site of photosynthesis?

    A. Mitochondria

    B. Vacuole

    C. Chloroplast

    D. Nucleus

    (1 mark)

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26. Question 26

    4 marks

    Photosynthesis is the process by which green plants make their own food.

    (a) Write a word equation for the process of photosynthesis. (2 marks)

    (b) State two conditions necessary for photosynthesis to take place. (2 marks)

    (4 marks)

    Marking scheme

    (a) Carbon dioxide + water -> (in the presence of sunlight and chlorophyll) glucose + oxygen. (b) Any two of: sunlight (light energy); chlorophyll; carbon dioxide; water; a suitable temperature.

27. Question 27

    1 mark

    A farmer in Kericho notices that maize growing in a heavily shaded corner of the field is pale and stunted. Which raw material for photosynthesis is MOST limited in that corner?

    A. Water

    B. Carbon dioxide

    C. Light

    D. Mineral salts

    (1 mark)

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