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observed given figure and identify with ...

observed given figure and identify with name and labelled A and B .

A

Anabaena , A - Akinete , B - Heterocyst

B

Nostoc , A - Heterocyst, B - Mucilaginous sheath

C

Nostoc , A - Akinete , B - Vegetative cells

D

Anabaena , A - Heterocyst , B - Mucilaginous sheath .

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The correct Answer is:
B
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