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Question

Azolla is used as a biofertilizer because:


A

It has an association with nitrogen fixing Cyanobacteria

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B

It has an association with nitrogen fixing Rhizobium

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C

It multiplies very quickly to produce massive biomass

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D

It has an association with mycorrhiza

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Solution

The correct option is A

It has an association with nitrogen fixing Cyanobacteria


Azolla is an aquatic water fern which symbiotically associates with anabaena. Anabaena is a free living filamentous nitrogen fixing cyanobacterium. But it is also found in a symbiotic association with azolla to fix atmospheric nitrogen in usable form. Inturn, the bacterium gets a safe environment for survival. This little fern and its algal partner provide an important contribution as a biofertiliser in increasing the soil nitrogen content. Hence, azolla is majorily used in production of rice.
Rhizobium is a symbiotic nitrogen fixing bacteria in association with the roots of leguminous plants.
Mycorrhiza is a symbiotic association of fungal species with the roots of plants.

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