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SolveItNCERT · CBSE · NEET

NCERT Exemplar · Class 10 Science Management of Natural Resources

37 questions · 37 still being checked

Multiple Choice Questions 21–24 (part 3 of 5)

  1. Exercise 21

    Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for
    (a)
    grain storage
    (b)
    wood storage
    (c)
    water harvesting
    (d)
    soil conservation

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    NCERT’s answer
    (c)
    (c) Water harvesting.Khadins are Rajasthan runoff-embankments, Bundhis are Madhya Pradesh/Uttar Pradesh check-dam tanks, Ahars are Bihar's field reservoirs, and Kattas are Karnataka's check dams — all traditional rainwater-harvesting structures.

  2. Exercise 22

    Pick the right combination of terms which has no fossil fuel.
    (a)
    Wind, ocean and coal
    (b)
    Kerosene, wind and tide
    (c)
    Wind, wood, sun
    (d)
    Petroleum, wood, sun

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    NCERT’s answer
    (c)
    (c) Wind, wood, sun.Wind and sunlight are non-fossil energy flows and wood is renewable biomass; the other options each smuggle in a fossil fuel — coal, kerosene, or petroleum.

  3. Exercise 23

    Select the eco-friendly activity among the following
    (a)
    Using car for transportation
    (b)
    Using polybags for shopping
    (c)
    Using dyes for colouring clothes
    (d)
    Using windmills to generate power for irrigation

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    NCERT’s answer
    (d)
    (d) Using windmills to generate power for irrigation.Wind is a clean, renewable source with no combustion or waste; cars burn fossil fuel, polybags are non-biodegradable, and dyes often carry toxic effluents.

  4. Exercise 24

    It is important to make small check dams across the flooded gullies because they
    (i)
    hold water for irrigation
    (ii)
    hold water and prevent soil erosion
    (iii)
    recharge ground water
    (iv)
    hold water permanently
    (a) (i) and (iv)
    (b) (ii) and (iii)
    (c) (iii) and (iv)
    (d) (ii) and (iv)

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    NCERT’s answer
    (b)
    (b) (ii) and (iii).A check dam slows and ponds the gully's runoff so it no longer scours the soil, and the standing water seeps down to recharge the aquifer, not remain held forever.