Read the following statements and select the correct options that are true for cyanobacteria :
(A) The colonies are generally surrounded by gelatinous sheath.
(B) They form blooms in polluted water bodies.
(C) They show nitrogenase activity in heterocyst.
(D) They perform oxygenic photosynthesis in vegetative cell only.

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(A) only

(A), (B) and (C) only

(B) and (C) only

(A), (B), (C) and (D)

answer is D.

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Detailed Solution

The colonies of cyanobacteria are generally surrounded by gelatinous sheath. They often form blooms in polluted water bodies. Some of these organisms can fix atmospheric nitrogen in specialised cells called heterocysts, e.g., Nostoc and Anabaena. They perform oxygenic photosynthesis in vegetative cells only.

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