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Question

A prokaryotic autotrophic nitrogen-fixing symbiont found in?


A

Cicer

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B

Pisum

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C

Cycas

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D

Alnus

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Solution

The correct option is C

Cycas


The correct option is C.

Explanation of correct option:

  1. Cycas is a gymnosperm that belongs to the family Cycadaceae.
  2. They contain a special type of root called coralloid roots.
  3. Anabaena cycadeae is a prokaryotic, blue-green algae. They are autotrophs and are mostly found in the coralloid roots.
  4. Anabaena forms a symbiotic relationship with Cycas plants and helps in nitrogen fixation.

Explanation of incorrect option:

Option A:

  1. In Cicer plants, nitrogen fixation is carried out by Rhizobium.
  2. Rhizobium is a free-living, heterotrophic bacteria found in the soil.

Option B:

  1. In Pisum plants, Rhizobium forms a symbiotic relationship with roots.
  2. Rhizobium, a heterotroph, helps in nitrogen fixation.

Option D:

  1. Nitrogen fixation is also observed in non-leguminous plants such as Alnus.
  2. In Alnus, nitrogen fixation is carried out by Frankia (a heterotroph).

Final answer: A prokaryotic autotrophic nitrogen-fixing symbiont found in Cycas.


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