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UPSC PYQPrelims 2020

Civil Services Examination · Question 80

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?

  1. 1 and 2 only
  2. 2 only
  3. 1 and 3 only
  4. 1, 2 and 3
Show answer & explanation

Answer: (D) 1, 2 and 3

Explanation

Biochar is a porous charcoal used in soil-less/vertical farming media; it improves water retention and supports beneficial microbes including nitrogen fixers.