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[A] : Heterocyst formation increases und...

[A] : Heterocyst formation increases under conditions of low light intensities .
[R] : The increase in the amount of phosphate in the medium leads to increase in heterocyst production .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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