Which one of the following statements is correct?
Correct answer: A. Legumes fix nitrogen only through the specialized bacteria that live in their roots.
- A. Legumes fix nitrogen only through the specialized bacteria that live in their roots.
- B. Legumes fix nitrogen independently of the specialized bacteria that live in their roots.
- C. Legumes fix nitrogen only through specialized bacteria that live in their leaves.
- D. Legumes are incapable of fixing nitrogen.
Explanation
The nitrogen-fixing ability of leguminous plants is not a property of the plants as such but results from infection of their roots by bacteria in the soil, leading to the formation of nodules. These organisms are Gram-negative motile rods that are classified in the genus Rhizobium.
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