Question

Explain.
Q.64. Photosynthesis in cyanobacteria is
(1) Anoxygenic
(2) Oxygenic
(3) Both (1) and (2)
(4) None of these

Q.65. Photosynthesis of Nostoc and Chlorobium is respectively
(1) Oxygenic, anoxygenic
(2) Anoxygenic, oxygenic
(3) Both oxygenic
(4) Both anoxygenic

Answer 1

Dear student,
Ans: 64 : 2
Cyanobacteria perform photosynthesis by absorbing carbon dioxide and releasing oxygen. These photosynthetic bacteria contain light harvesting pigments.
Ans 65: 1
Nostoc is a cyanobacteria which contain photosynthetic pigments to perform photosynthesis releasing oxygen.
Chlorobium is a green sulphur bacteria. They also perform photosynthesis but do not evolve oxygen. Hydrogen sulfide is used as an electron source and carbon dioxide as its carbon source.

Regards.