Water Conservation

21 Grade 4 Agriculture questions on Water Conservation, with worked marking schemes. 21 questions are available on this topic in full.

1. Question 1

   1 mark

   Planting cover crops or grass helps to conserve water because they:

   A. Reduce water loss and keep the soil moist

   B. Dry out the soil much faster

   C. Use up all the water in the soil

   D. Stop rain from falling on the land

   (1 mark)

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2. Question 2

   1 mark

   Which irrigation method saves the most water by releasing it slowly near the roots?

   A. Overhead sprinklers left on all day

   B. Drip irrigation

   C. Flood irrigation

   D. Furrow flooding

   (1 mark)

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3. Question 3

   1 mark

   Aisha notices a tap dripping steadily in the school garden. What is the best action to take?

   A. Ignore it because it is only a few drops

   B. Open it fully to clear the blockage

   C. Place a bucket under it and let it keep dripping

   D. Report it so that it is repaired quickly

   (1 mark)

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4. Question 4

   3 marks

   State three sources of water that can be used on a farm.

   (3 marks)

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5. Question 5

   3 marks

   Explain how mulching helps to conserve water in a vegetable garden.

   (3 marks)

   Marking scheme

   Mulch covers the soil and reduces evaporation of water from the surface (1); it keeps the soil cool and moist for longer (1); this reduces how often the crops need watering / it also suppresses weeds that would compete for water (1).

6. Question 6

   1 mark

   A water pan or small dam on a farm is useful because it:

   A. Drains all water off the farm

   B. Washes away the topsoil quickly

   C. Stores rainwater for use during dry seasons

   D. Increases evaporation of water

   (1 mark)

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7. Question 7

   1 mark

   A family uses a lot of water because the hose is left running while washing the yard. The best improvement is to:

   A. Use a bucket and mop instead of the running hose

   B. Water the flower beds at the same time

   C. Wash the yard twice as often

   D. Add a second hosepipe to finish faster

   (1 mark)

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8. Question 8

   1 mark

   Which activity best helps to conserve water in a home vegetable garden?

   A. Spreading mulch on the soil around the plants

   B. Watering the plants at midday when the sun is hottest

   C. Using a wide hosepipe to water one small bed

   D. Leaving the tap running while weeding

   (1 mark)

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9. Question 9

   1 mark

   Which tool wastes the least water when watering young seedlings?

   A. An open hosepipe

   B. A running tap left flowing

   C. A watering can with a rose

   D. A bucket poured out all at once

   (1 mark)

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10. Question 10

    6 marks

    (a) Explain what is meant by water conservation.

    (b) Describe two methods of conserving water on a farm.

    (6 marks)

    Marking scheme

    (a) Water conservation is the wise and careful use and saving of water to avoid waste and ensure enough is available for the future (2). (b) 2 marks each (any two described): mulching — covering soil to reduce evaporation; drip irrigation — delivering water slowly to roots to reduce waste; rainwater harvesting — storing rain in tanks/pans for later use; fixing leaks — repairing pipes and taps to stop water loss.

11. Question 11

    2 marks

    State two reasons why we should conserve water at home.

    (2 marks)

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12. Question 12

    1 mark

    Which is a way of harvesting rainwater at home?

    A. Collecting roof runoff in a storage tank

    B. Pouring tap water onto the roof

    C. Sweeping rainwater into the pit latrine

    D. Letting the rain flow into the road

    (1 mark)

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13. Question 13

    1 mark

    To reduce water loss, vegetables are best watered:

    A. At midday when it is hottest

    B. When it is very windy and dry

    C. At noon every day

    D. Early in the morning or in the evening

    (1 mark)

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14. Question 14

    2 marks

    Give two problems a community may face if water is not conserved.

    (2 marks)

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15. Question 15

    1 mark

    Mulching conserves water mainly by:

    A. Making the soil become hotter

    B. Reducing evaporation from the soil surface

    C. Blocking roots from reaching water

    D. Adding more water into the soil

    (1 mark)

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16. Question 16

    4 marks

    (a) Name two ways of harvesting rainwater at home.

    (b) Give two uses of the harvested water.

    (4 marks)

    Marking scheme

    (a) 1 mark each (any two): collecting roof runoff into tanks; digging water pans/dams; digging trenches/zai pits to trap runoff. (b) 1 mark each (any two): watering crops/irrigation; domestic use such as washing and cleaning (drinking after treatment); watering animals.

17. Question 17

    1 mark

    What is the main reason for conserving water on a farm?

    A. To make the farm look tidy for visitors

    B. Water is free and can never be finished

    C. So that crops grow taller than the neighbour's

    D. Water is a scarce resource that can run out

    (1 mark)

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18. Question 18

    1 mark

    Which of the following is NOT a way of conserving water?

    A. Leaving taps running after use

    B. Mulching the garden beds

    C. Fixing leaking pipes

    D. Harvesting rainwater

    (1 mark)

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19. Question 19

    5 marks

    Wanjiku waters her kale at midday using a hosepipe that is left running.

    (a) State two problems with her method.

    (b) Suggest three better ways she can water her kale to conserve water.

    (5 marks)

    Marking scheme

    (a) 1 mark each: much water is lost through evaporation at midday; the running hose wastes a lot of water. (b) 1 mark each (any three): water early morning or evening; use a watering can or drip method; mulch the soil to hold moisture; direct water only to the root area.

20. Question 20

    4 marks

    List four ways a pupil can conserve water while working in the school garden.

    (4 marks)

    Marking scheme

    1 mark each (any four): close taps tightly after use; report or fix leaking taps; water early morning or evening; use a watering can instead of a running hose; mulch the beds; reuse rinse water; harvest rainwater for the garden.

21. Question 21

    1 mark

    Which used water can be safely reused to water flowers?

    A. Water used to rinse vegetables

    B. Water mixed with paraffin

    C. Soapy water containing bleach

    D. Water drained from the pit latrine

    (1 mark)

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