Selected Crop Management Practices

23 Grade 7 Agriculture questions on Selected Crop Management Practices, with worked marking schemes. 23 questions are available on this topic in full.

1. Question 1

   1 mark

   Providing support to climbing crops such as tomatoes and passion fruits using sticks or wires is known as:

   A. Weeding

   B. Earthing up

   C. Thinning

   D. Staking

   (1 mark)

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2. Question 2

   1 mark

   A farmer notices weeds growing among his young bean plants and competing with them. Which crop management practice should he carry out to deal with the weeds?

   A. Weeding to remove the unwanted plants

   B. Harvesting the beans immediately

   C. Adding more weeds to the field

   D. Watering the weeds heavily

   (1 mark)

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3. Question 3

   1 mark

   A farmer covers the soil around tomato plants with dry grass. This practice of mulching helps to:

   A. Increase soil erosion

   B. Attract more pests

   C. Make weeding more difficult

   D. Conserve soil moisture and suppress weeds

   (1 mark)

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4. Question 4

   1 mark

   A learner observes that tomato plants in the school garden are falling over and the fruits touch the soil and rot. Which management practice would BEST solve this problem?

   A. Staking the tomato plants to support them upright

   B. Watering the plants twice as much

   C. Removing all the leaves

   D. Adding more seeds to the same hole

   (1 mark)

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5. Question 5

   1 mark

   The removal of excess seedlings to leave the correct spacing between crops is called:

   A. Gapping

   B. Mulching

   C. Thinning

   D. Pruning

   (1 mark)

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6. Question 6

   1 mark

   Replacing seeds or seedlings where germination has failed so as to maintain the correct plant population is known as:

   A. Thinning

   B. Gapping

   C. Earthing up

   D. Weeding

   (1 mark)

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7. Question 7

   1 mark

   A Grade 7 learner sees that some tomato plants are bending over and falling to the ground as they grow taller. Which management practice would help support the plants and keep the fruits clean?

   A. Thinning the seedlings

   B. Staking the plants

   C. Pouring water on the leaves

   D. Removing all the leaves

   (1 mark)

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8. Question 8

   1 mark

   Removing unwanted branches or shoots from a crop to improve growth and yield is known as:

   A. Gapping

   B. Pruning

   C. Earthing up

   D. Top dressing

   (1 mark)

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9. Question 9

   1 mark

   A farmer notices that weeds are growing among young bean plants and competing for nutrients. Which crop management practice should the farmer carry out?

   A. Weeding to remove the unwanted plants

   B. Harvesting the beans immediately

   C. Adding more weeds as mulch while still rooted

   D. Leaving the field unattended until harvest

   (1 mark)

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10. Question 10

    1 mark

    A maize crop shows overcrowded seedlings in some spots and gaps in others. Which two practices should the farmer carry out to correct this?

    A. Pruning and staking

    B. Mulching and irrigation

    C. Thinning and gapping

    D. Weeding and harvesting

    (1 mark)

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11. Question 11

    1 mark

    Why is it important to weed a crop early, when the weeds are still young?

    A. Old weeds do not compete with crops

    B. Young weeds are easier to remove and cause less damage

    C. Young weeds are more nutritious to the crop

    D. Weeding late increases the yield

    (1 mark)

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12. Question 12

    1 mark

    Which of the following is a benefit of correct spacing when planting a crop?

    A. Each plant gets adequate nutrients, water and sunlight

    B. More weeds grow

    C. Plants compete more for resources

    D. Yields are reduced

    (1 mark)

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13. Question 13

    3 marks

    Explain three benefits of mulching a vegetable garden.

    (3 marks)

    Marking scheme

    Any 3 (1 mark each): conserves soil moisture by reducing evaporation; suppresses/controls weed growth; moderates soil temperature; reduces soil erosion; adds organic matter/nutrients to the soil as it decomposes; keeps fruits/vegetables clean.

14. Question 14

    1 mark

    Which of the following pairs are both methods of controlling weeds in a crop field?

    A. Thinning and staking

    B. Pruning and grafting

    C. Uprooting by hand and using a hoe

    D. Watering and harvesting

    (1 mark)

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15. Question 15

    4 marks

    A Grade 7 learner has established a kale (sukuma wiki) plot. Explain four crop management practices the learner should carry out to obtain a good yield.

    (4 marks)

    Marking scheme

    Any 4 (1 mark each): weeding to reduce competition; thinning/gapping to keep correct spacing; top dressing/applying manure to supply nutrients; watering/irrigation during dry periods; mulching to conserve moisture; pest and disease control; harvesting at the right stage.

16. Question 16

    1 mark

    Which of the following is the MAIN reason for weeding a crop?

    A. To increase the number of pests

    B. To reduce competition for nutrients, water and light

    C. To reduce the crop yield

    D. To make the soil harder

    (1 mark)

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17. Question 17

    4 marks

    (a) State what is meant by top dressing.

    (b) Explain two precautions a farmer should observe when top dressing a crop.

    (4 marks)

    Marking scheme

    (a) (2 marks): top dressing is the application of fertilizer (usually nitrogenous) to a growing crop to supply additional nutrients for continued growth. (b) Any 2 (1 mark each): apply when the soil is moist / after rain; avoid placing fertilizer directly on the leaves/stem to prevent scorching; apply the recommended amount; apply a little away from the plant base; avoid application in strong wind.

18. Question 18

    4 marks

    State two reasons why weeds are harmful to a growing crop and give two methods a farmer can use to control them.

    (4 marks)

    Marking scheme

    Reasons (any 2, 1 mark each): compete with crops for nutrients/water/light/space; harbour pests and diseases; reduce crop yield/quality; some are poisonous. Control methods (any 2, 1 mark each): hand pulling/uprooting; using a hoe/jembe; mulching; use of herbicides; crop rotation; proper spacing/cover crops.

19. Question 19

    4 marks

    A farmer transplanted tomato seedlings but after one week noticed several planting holes had no plants.

    (a) Name the practice needed to correct this.

    (b) Give two reasons why the seedlings may have failed to establish.

    (4 marks)

    Marking scheme

    (a) (2 marks): gapping. (b) Any 2 (1 mark each): lack of water/moisture stress; damage during transplanting; pest or disease attack; poor/weak seedlings; too much sun/heat/wilting; soil-borne problems.

20. Question 20

    1 mark

    A farmer applies water to crops during a dry spell to enable them to continue growing. This practice is called:

    A. Thinning

    B. Irrigation

    C. Mulching

    D. Pruning

    (1 mark)

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21. Question 21

    1 mark

    Which crop management practice involves heaping soil around the base of crops such as potatoes and maize?

    A. Earthing up

    B. Grafting

    C. Pruning

    D. Thinning

    (1 mark)

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22. Question 22

    4 marks

    Distinguish between thinning and gapping as crop management practices.

    (4 marks)

    Marking scheme

    Thinning (2 marks): the removal of excess/overcrowded seedlings to leave the recommended spacing so that plants do not compete for nutrients, water and light. Gapping (2 marks): the replacing/replanting of seeds or seedlings in positions where germination failed so as to maintain the correct plant population per unit area.

23. Question 23

    1 mark

    Adding fertilizer to a growing crop to supply extra nutrients is referred to as:

    A. Gapping

    B. Thinning

    C. Top dressing

    D. Mulching

    (1 mark)

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