Q5 / 161 · NTA Abhyas (NEET) 2020 · Botany · Mineral Nutrition

Which one of the following statement is CORRECT?

  • A
    Legumes fix nitrogen only through specialized bacteria that live in their leaves.
  • B
    Legumes alone are capable of fixing nitrogen.
  • Correct answer
    C
    Legumes fix nitrogen only through the specialized bacteria that live in their roots.
  • D
    Legumes fix nitrogen independently of the specialized bacteria that live in their roots.

Solution

Nitrogen-fixing bacteria like Rhizobium form a symbiotic relationship with the leguminous plants in their roots. These microbes form root nodules in the legumes through which they fix nitrogen. The root nodule helps creating zero-oxygen environment to conduct nitrogen fixation process. The bacteria have the enzyme nitrogenase that helps in the process of fixing nitrogen.

Hence, the correct answer is option: 'C'.

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