For each molecule of ammonia produced by nitrogenase, the number of ATP molecules required are:
1. 4
2. 8
3. 12
4. 16

The first stable product of fixation of atmospheric nitrogen in leguminous plants is

1. ${\mathrm{NO}}_2^{-}$

2. ammonia

3. ${\mathrm{NO}}_3^{-}$

4. glutamate

Plants do not get benefit from

(1) N₂ in air

(2) O₂ in air

(3) CO₂ in air

(4) O₃ in air.

Nitrogen:
Find the incorrect one.
1. Plants compete with microbes for it.
2. It is a limiting nutrient for both natural and agricultural ecosystem
3. Nitrogen has triple covalent bonds
4. Nitrogen fixation is conversion of nitrogen into nitrate

In nature, ……….. and ……….. provide enough energy to convert Nitrogen to nitrogen oxides (NO, NO₂, N₂O).

Decomposition of organic nitrogen of dead plants and animals into ammonia is called

What type of reaction is shown in the given figure?


1. Deamination
2. Reductive amination
3. Transamination
4. Nitrogenation

In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:

1. Ammonia

2. Glutamate

3. Nitrates

4. Ureides