UPSC Previous Year Question | Prelims GS | 2020

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.

  1. 1 and 2 only
  2. 2 only
  3. 1 and 3 only
  4. 1, 2 and 3

Answer

Correct Answer

1, 2 and 3

Explanation

Biochar is a porous, carbon-rich material that can be part of a soil-less growing medium, improves water retention, and encourages beneficial microbes including nitrogen fixers. All three statements are correct.

Topics: agriculture & soil management, biochar - soil amendment & growing medium, environment & ecology, sustainable agriculture