MCQ
Hair present in the skin are:
- AEpidermal in origin and made of dead cells.
- BEpidermal in origin and made of living cells.
- CDermal in origin and made of living cells.
- DDermal in origin and made of dead cells.
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$(i)$ Unicellular, colonial, filamentous, symbiotic or free living.
$(ii)$ The colonies are surrounded by a gelatinous sheath.
$(iii)$ Some can fix atmospheric nitrogen in specialized cells called heterocysts.
$(iv)$ They often form blooms in water bodies.