The given figure shows the structure of filamentous blue green algae, Nostoc with a structure marked as X. Select the option which shows the correct identification of the X with its feature.

A. Spores - Reproduction

B. Heterocysts - Nitrogen fixation

C. Pellicle - Recycling of nutrition

D. Mucilaginous sheath - Photosynthesis

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Correct Answer : B.

Heterocysts are pale-yellow, thick-walled cells that are capable of nitrogen fixation and therefore play a major part in the nitrogen cycle.

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