1.

Which of the following increases the fertility of soil (A) Lactobacillus bacteria (B) Rhizobium bacteria (C) Spirogyra algae (D) Blue-green algaeA. A and B B. B and C C. A and D D. B and D

Answer»

D. B and D 

B and D as these two organisms are able to fix nitrogen gas from atmosphere to enrich soil with nitrogen compounds hence increasing fertility of soil



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