Question:medium

Sequence the principal stages of biological nitrogen fixation in their correct order of occurrence.
(A) Formation of infection thread
(B) Rhizobium multiply to colonize.
(C) Curling of root hair.
(D) Differentiation of cortical cells into nitrogen fixing cells

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Biological nitrogen fixation for enriching soil with nitrogen, a key nutrient for plants, especially legumes.
Updated On: Jan 17, 2026
  • (B), (C), (A), (D)
  • (A), (B), (C), (D)
  • (B), (A), (D), (C)
  • (C), (B), (D), (A)
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The Correct Option is A

Solution and Explanation

The sequence for biological nitrogen fixation is as follows:
1. Rhizobium proliferate and colonize the root.
2. Root hairs subsequently curl.
3. An infection thread then forms.
4. Cortical cells finally differentiate into nitrogen-fixing cells.
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