Plant KingdomHard

Question

Which of the following cannot fix nitrogen ?

Options

A.Nostoc
B.Azotobacter
C.Spirogyra
D.Anabaena

Solution

Spirogyra is a free floationg, filamentous, green, fresh water alga, popularly called pond silk. It forms a green slimy mass on the surface of standing and stagnant water of ponds during spring season, henc, also called pond scum. It has no rol in nitronen fixation, whereas blue-green like Nostoc, Anabaena are the important nitrogenfixing cyanobacteria, used as biofertilizer. Azotobacter is the aerobic free living /non-symbiotic nitrogen fixer.

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