NEET UG 2021 · Botany · Question 140
NEET 2021 Botany, question 140
Question 140 of the NEET 2021 paper (code O1) is a Botany question from Mineral Nutrition. Its idea, Nitrification: Ammonia to Nitrite, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q140 · Botany
Match Column - I with Column - II.
| Column - I | Column - II |
|---|---|
| (a) Nitrococcus | (i) Denitrification |
| (b) Rhizobium | (ii) Conversion of ammonia to nitrite |
| (c) Thiobacillus | (iii) Conversion of nitrite to nitrate |
| (d) Nitrobacter | (iv) Conversion of atmospheric nitrogen to ammonia |
Choose the correct answer from options given below.
- 1(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
- 2(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
- 3(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)Official answer
- 4(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
Official answer: option 3 · NTA final answer key
Same idea
The only question on Nitrification: Ammonia to Nitrite
No other NEET paper from 2017–2026 tested this exact idea.
Nitrification: Ammonia to Nitrite: every question and how it was framed
The chapter
Mineral Nutrition in ten years of NEET
12 questions from 2017–2026, asked in 8 of 10 papers, about 1.1 a paper. Nitrogen Fixation alone had 6.