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General Studies CSAT Previous year questions

Q80 · UPSC Prelims 2020 · Set A · Art and Culture

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What is the use of biochar in farming?1.Biochar can be used as a part of the growing medium in vertical farming.2.When biochar is a part of the growing medium, it promotes the growth of nitrogen-fixing microorganisms.3.When biochar is a part of the growing medium, it enables the growing medium to retain water for longer time.Which of the statements given above is/are correct?

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A 1 and 2 only
B 2 only
C 1 and 3 only
D 1, 2 and 3

Correct answer: (d) 1, 2 and 3

Explanation

  1. A

    1 and 2 only

    1 and 2 only. Water retention is also true.

  2. B

    2 only

    2 only. Under-counts.

  3. C

    1 and 3 only

    1 and 3 only. N-fixers also hold.

  4. D

    1, 2 and 3

    All three. Vertical-farm medium, habitat for nitrogen-fixers, and longer water hold.

Summary. Official key is (d) 1, 2 and 3. Biochar in a growing medium suits vertical farming, favours nitrogen-fixing microbes, and holds water.

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  1. 2020 · Q90 · General Studies · 2 marks

    In the context of India, which of the following is/are considered to be practice(s) of eco-friendly agriculture? 1. Crop diversification 2. Legume intensification 3. Tensiometer use 4. Vertical farming Select the correct answer using the code given below:

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← 2020 Set A paper