The process of conversion of atmospheric nitrogen into nitrates by microorganisms is called: MCQ with Answer and Explanation

The process of conversion of atmospheric nitrogen into nitrates by microorganisms is called:
A. Denitrification
B. Nitrification
C. Nitrogen fixation
D. Ammonification
Answer: Option C
Solution (By JKSSB Mock Tests)
Nitrogen fixation is the process by which atmospheric N₂ is reduced to ammonia, which is then converted into nitrates that plants can absorb. This can be biological (by bacteria like Rhizobium, Azotobacter), physical (lightning), or industrial (Haber-Bosch process). Nitrification is the oxidation of ammonia to nitrates. Ammonification releases ammonia from organic matter. Denitrification converts nitrates back to N₂.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
The structure that protects the tip of the growing shoot is the:
A. Terminal bud
B. Apical meristem
C. Root cap
D. Leaf primordia

Correct Answer: Option A


Explanation:
The terminal (apical) bud, containing the shoot apical meristem, is covered by young leaf primordia, which protect the delicate meristematic tissue. The root cap protects the root apical meristem. Leaf primordia develop into leaves. Terminal buds are often dormant in winter.

This question belongs to: Science Biology
Question #2
The type of epithelial tissue that lines the respiratory tract and moves mucus is:
A. Cuboidal epithelium
B. Transitional epithelium
C. Squamous epithelium
D. Ciliated columnar epithelium

Correct Answer: Option D


Explanation:
Ciliated pseudostratified columnar epithelium (with goblet cells) lines the trachea and bronchi; the cilia beat in coordinated waves to move mucus and trapped particles out of the airways. Squamous epithelium is flat (alveoli), cuboidal in kidney tubules, transitional in urinary bladder.

This question belongs to: Science Biology
Question #3
Fungi primarily reproduce asexually by the formation of:
A. Gems
B. Seeds
C. Spores
D. Buds only

Correct Answer: Option C


Explanation:
Fungi reproduce asexually primarily through the formation of spores, which are produced in large numbers in specialized structures like sporangia (in Rhizopus) or conidiophores (in Aspergillus). These spores are highly resistant and can be dispersed by wind, water, or animals. Some fungi, like yeast, also reproduce asexually by budding.

This question belongs to: Science Biology