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Question

The organism which is autotrophic but does not have the pigment is


A

Nostoc

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B

Wolffia

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C

Yeast

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D

Nitrosomonas

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Solution

The correct option is D

Nitrosomonas


The correct option is D.

Explanation of the correct option:

  1. Nitrosomonas do not undergo photosynthesis because they lack chlorophyll.
  2. They convert ammonia to nitrite.
  3. Further, Nitrobacter converts nitrite into nitrate.

Explanation of the incorrect options:

Option A:

Nostoc is a photoautotroph that has pigments that also fix atmospheric nitrogen.

Option B:

Wolffia is a photoautotroph that has pigments.

Option C:

Yeast is a fungus that feeds on dead and decaying matter.

Final answer: The organism which is autotrophic but does not have the pigment is Nitrosomonas.


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