Correct option is D
Explanation-
Option a - NO (Nitric oxide) – Nitric oxide is a gaseous signaling molecule in plants. It plays roles in seed germination, stomatal closure, stress responses, and plant defense. It is not a direct product of deamination.
Option b - NO₂⁻ (Nitrite) – Intermediate in the nitrification process (conversion of NH₄⁺ to NO₃⁻ by soil bacteria) , also formed during nitrate assimilation (NO₃⁻ → NO₂⁻ → NH₄⁺ in plants). But it is not formed directly during deamination.
Option c - NO₃⁻ (Nitrate) – Major nitrogen source absorbed by plant roots from the soil. Nitrate ions is produced in soil by nitrifying bacteria converting nitrite (NO₂⁻) to nitrate (NO₃⁻), but not a deamination product.
Option d - NH₄⁺ (Ammonium) – This is the correct answer. During deamination, amino groups (−NH₂) are removed from amino acids, producing ammonia (NH₃), which is quickly converted into ammonium (NH₄⁺) in plant cells.
So, the correct answer is option d - NH₄⁺ (Ammonium).
