Explore topic-wise MCQs in Biology.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.

1.

The process under which nitrogen and hydrogen combine to form ammonia under high temperature and pressure conditions is called as _________

A. biological N<sub>2</sub> fixation
B. natural N<sub>2</sub> fixation
C. electrical N<sub>2</sub> fixation
D. industrial N<sub>2</sub> fixation
Answer» E.
Discussion
2.

The form of nitrogen absorbed by plants is _________

A. NO<sub>2</sub><sup> </sup>
B. N<sub>2</sub>O
C. NH<sub>3</sub>
D. NO
Answer» B. N<sub>2</sub>O
Discussion
3.

Enzymes for nitrogen fixation are found exclusively in eukaryotes.

A. True
B. False
Answer» C.
Discussion
4.

Statement A: Nodule formation involves a direct interaction between Rhizobium and leaves of host plant.
Statement B: The differentiation of cortical and pericycle cells lead to nodule formation.

A. Both the statements are true
B. Both the statements are false
C. Statement A is true but Statement B is false
D. Statement B is true but Statement A is false
Answer» C. Statement A is true but Statement B is false
Discussion
5.

Which organism is capable of carrying out denitrification?

A. Nitrosomonas
B. Beijernickia
C. Pseudomonas
D. Nitrobacter
Answer» D. Nitrobacter
Discussion
6.

Which is the first stable product of nitrogen fixation?

A. N<sub>2</sub>
B. NH<sub>3</sub>
C. NH<sub>4</sub><sup>+</sup>
D. NO<sub>3</sub><sup> </sup>
Answer» C. NH<sub>4</sub><sup>+</sup>
Discussion
7.

Statement A: Legume bacteria relationship is an example of symbiotic biological nitrogen fixation.
Statement B: The association is represented by formation of root knots.

A. Both the statements are true
B. Both the statements are false
C. Statement A is true but Statement B is false
D. Statement B is true but Statement A is false
Answer» D. Statement B is true but Statement A is false
Discussion
8.

Nitrogen is a limiting nutrient for both agricultural and natural ecosystems.

A. True
B. False
Answer» B. False
Discussion
9.

Which of the following is not a pool for nitrogen cycle?

A. Atmosphere
B. Ocean
C. Soil
D. Biomass
Answer» C. Soil
Discussion