Please answer 90th question
Q.90. A photosynthesising organism, which does not release molecular oxygen during the process, is
(a) green sulphur bacterium
(b) algal component of lichen
(c) blue green algae
(d) spirochaete

Dear student,     
Please find below the solution to the asked query                                                             

In the process of photosynthesis, some organisms do not give out molecular oxygen as a by-product. This is known as anoxygenic photosynthesis. Organisms which show this type of photosynthesis are- green sulphur bacteria (give out elemental sulphur), purple bacteria etc.

Hence, option (a) is correct.

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