Question

Question No. 19
Find the incorrect statement regarding nitrogen & its metabolism
(A) Plants compete with microbes for the limited nitrogen that is available in soil
(B) It is a limiting nutrient for both natural and agricultural eco-systems
(C) Industrial combustions, automobile exhausts and power-generating stations
atmospheric nitrogen oxides
(D) Ammonia is first reduced to nitrite by the bacteria Nitrosomonas​

Answer 1

Answer:

a.correct

b.correct

c.incorrect

d. incorrect

Answer 2

The incorrect statement is, ammonia is first reduced to nitrite by the bacteria Nitrosomonas.

• Nitrogen cycle is one of the most important biological activities, related to the plants ecosystem.
• In this cycle, the nitrogenous gas ammonia is oxidised to the nitrite by the bacteria like Nitrosomonas.
• And, after that, the nitrite is reduced to nitrate by other bacteria.
• So, the process of changing ammonia into nitrite is a oxidation process, not a reduction process.
• That's why, statement D is incorrect.