UPSC Prelims 2016 Question 8 of 97

a. Release of Neem oil in the soil increases nitrogen fixation by the soil microorganisms

b. Neem coating slows down the rate of dissolution of urea in the soil

c. Nitrous oxide, which is a greenhouse gas, is not at all released into the atmosphere by crop fields

d. It is a combination of a weedicide and a fertilizer for particular crops