UPSC Prelims GS - 2020

Question 100
MEDIUMCorrect: +2Incorrect: -2

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?

    a
    1 and 2 only
    b
    2 only
    c
    1 and 3 only
    d
    1, 2 and 3