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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.
  • a)
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • c)
    If Assertion is true but Reason is false.
  • d)
    If both Assertion and Reason are false.
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Assertion : Cyclic pathway of photosynthesis first appeared in some eu...
Cyclic pathway of photosynthesis 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
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Assertion : Cyclic pathway of photosynthesis first appeared in some eu...
Assertion and Reason Analysis:
Assertion and Reason are both true in this scenario. However, the Reason does not provide a correct explanation for the Assertion. Let's break it down further:

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.

Explanation:

The Evolution of Photosynthesis:
- The cyclic pathway of photosynthesis is believed to have been one of the earliest forms of photosynthesis to evolve in eubacterial species.
- This pathway allowed organisms to harness light energy for the synthesis of organic molecules without producing oxygen as a byproduct.

Accumulation of Oxygen:
- Oxygen accumulation in the atmosphere occurred after the evolution of the non-cyclic pathway of photosynthesis.
- The non-cyclic pathway, also known as oxygenic photosynthesis, produced oxygen as a byproduct, leading to its accumulation in the atmosphere over time.

Conclusion:
- While it is true that the cyclic pathway appeared in eubacterial species before the non-cyclic pathway, the reason for the accumulation of oxygen in the atmosphere is not directly linked to the evolution of the cyclic pathway.
- The accumulation of oxygen is a result of the non-cyclic pathway of photosynthesis, which evolved later in the evolutionary timeline.
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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.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion.b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.c)If Assertion is true but Reason is false.d)If both Assertion and Reason are false.Correct answer is option 'B'. Can you explain this answer?
Question Description
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