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A : Azotodesmic lichens are biofertilise...

A : Azotodesmic lichens are biofertilisers enriching nitrogen contents in soil.
R : This ability is due to the presence of heterocystous blue-green algae as phycobiont component.

A

If both assertion & reason are true and the reason is the correct explanation of the assertion

B

If both assertion & reason are true but the reason is not the correct explanation of the assertion

C

If assertion is true statement but reason is false

D

If both assertion and reason are false statements

Text Solution

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The correct Answer is:
A
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During monsoon days, a blue green layer was developed on moist soil of village streets making them slippery. On the instruction of science teacher Ghanshyam collected this upper slippery layer of soil from the village street and dried it. Then he added this powder to this crop field. He got very good crop yield without using any fertilizers (i) Which group of organisms is responsible for this blue green layer ? (ii) What is the possible reason for increased crop yield after addition of blue green layer to the fields (iii) Name one blue green alga which do nitrogen fixation (iv) Name one blue green alga which is a good source of protein.

Assertion (A): Blue green algae are popular as biofertilisers. Reason (R) : Blue green algae cause algal bloom in polluted water bodies.