The plants receive Nitrogen in form of

Correct answer: (b) Nitrate

Explanation

Plants absorb nitrogen from the soil mainly as nitrates (NO₃⁻) through their root hairs.

Although the atmosphere is 78% nitrogen gas (N₂), plants cannot use it directly until it is fixed into nitrate.

Ammonia and nitric oxide are intermediates, not the chief absorbed form; nitride is irrelevant.