Home
Class 12
BIOLOGY
Assertion (A) : Cyanobacteria are photos...

Assertion (A) : Cyanobacteria are photosynthetic blue green algae which produce oxygen.
Reason (R) : Cyanobacteria played a key role in the changes of atmospheric oxygen levels from So anaerobic to acerobic during the geologic periods.

Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion.Cyanobacteria are photosynthetic blue-green algae with procaryotic structure. Reason. They are green due to presence of chloroplasts.

Assertion.Cyanobacteria are photosynthetic blue-green algae with procaryotic structure. Reason. They are green due to presence of chloroplasts.

Assertion.Cyanobacteria are photosynthetic blue-green algae with procaryotic structure. Reason. They are green due to presence of chloroplasts.

Assertion. Cyanobacteria are the only photosynthetic nitrogen fixing prokaryotes producing oxygen. Reason. Oxygen is required for the activity of enzyme nitrogenase.

Assertion (A): Methanogens do not produce oxygen. Reason (R) : Methanogens are obligate anaerobic micro-organisms.

Assertion: They were cyanobacteria- like organisms, which in ancient time added oxygen to the atmosphere. Reason: Cyanobacteria were photoautotrophic.

A: The first photosynthetic organisms which show oxygenic photosynthesis were cyanobacteria. R: Photosynthesis by Eubacteria is Anoxygenic.

Assertion: Blue green algae have chlorophyll 'a'. Reason: Photosynthesis with the help of Bateriochlorophyll releases oxygen.