MCQ
Life without air would be.
- AReductional.
- BFree from oxidative damage.
- CImpossible.
- ✓Anaerobic.
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Choose the correct combination of $A$ and $B$
$(i)$ 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.