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Question
Azolla is used as a biofertilizer because:
Azolla is used as a biofertilizer because:
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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.
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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