Photosynthesis In Higher Plants Question 150
Question: Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species. Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved. [AIIMS 2004]
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: B
Solution:
Cyclic pathway of photosynthesis is appeared first in some eubacterial species.
It is supposed to be the first evidence of production of ATP in the presence of light.
During non-cyclic photophosphorylation photolysis of water takes place.
Under the influence of light energy and the catalytic action of chlorophyll, water a substance of low energy value, is split up into oxygen and hydrogen.
Oxygen is used in the chloroplast.
Non-cyclic photophosphorylation is the only natural process which adds molecular oxygen to the atmosphere.
BETA
