Assertion :Bacterial photosynthesis occurs by utilizing wavelength longer than 700 nm. Reason: Here reaction centre is B-890.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Bacteria use radiant energy between 870 to 1020 nm of the infrared region instead of visible light for photosynthesis. Thus the reaction center is B-890 which is the only pigment system present but both the cyclic and noncyclic reaction takes place in it. It utilizes hydrogen sulfide, thiosulphate as reducing power and does not evolve oxygen and maximum absorption is between 600 to 700 nm. Thus, the correct answer is option B.

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