Which combination of the following statements is CORRECT for cyanobacteria ? P. They can perform oxygenic photosynthesis Q. Usually filamentous forms are involved in nitrogen fixation R. Nitrogen fixation occurs in heterocysts S. They cannot grow in a mineral medium exposed to light and air

Which combination of the following statements is CORRECT for cyanobact

1.	Which combination of the following statements is CORRECT for cyanobacteria ? P. They can perform oxygenic photosynthesis Q. Usually filamentous forms are involved in nitrogen fixation R. Nitrogen fixation occurs in heterocysts S. They cannot grow in a mineral medium exposed to light and air
A.	P, Q and R
B.	P, S and R
C.	Q, R and S
D.	P, Q and S
Answer» B. P, S and R

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Which combination of the following statements is CORRECT for cyanobacteria ? P. They can perform oxygenic photosynthesis Q. Usually filamentous forms are involved in nitrogen fixation R. Nitrogen fixation occurs in heterocysts S. They cannot grow in a mineral medium exposed to light and air

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