Question

In a village street , there was a blue green layer on the moist soil which was slippery . A student of class 9th collected a upper slippery layer of soil and carried it to the school . Student ask this question to the biology teacher
a) Identification of blue green layer
b) Give its significance
c) Name the blue green algae which do nitrogen fixation

Answer 1

those are algae
it constitutes the link of food chain
anabena,nostoc etc

Answer 2

the bluegreen algae is fungi present in water and it does not react with nitrogen it's significance is travelling easily in air and the bacteria present in that algae is cannot visible ro our naked eye


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