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Question

Heterocysts are specialized for nitrogen fixation as they are


A

Impermeable to oxygen

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B

Impermeable to nitrogen

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C

Lacking water-splitting in photosystem 2

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D

Both (A) and (C)

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Solution

The correct option is D

Both (A) and (C)


The correct option is D.

Explanation of the correct option:

  1. A heterocyst is a differentiated cyanobacterial cell that performs nitrogen fixation.
  2. Heterocysts serve as sites for nitrogen fixation under aerobic conditions.
  3. They are formed in response to a certain nitrogen deficiency.
  4. They have an additional glycolipid layer that makes them impermeable to oxygen.
  5. They have degraded photosystem 2 and fail to generate oxygen.
  6. They lack water splitting photosystem 2.

Explanation of the incorrect options:

Option B:

  1. Heterocysts are nitrogen permeable and carry out nitrogen fixation.

Final answer: Heterocysts are specialized for nitrogen fixation as they are impermeable to oxygen and lack water splitting photosystem 2.


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