The Question is from neet-botany , and it was created by the author B VENKAT

Question

During cyclic photophosphorylation, electrons from Photosystem I are ultimately accepted by:

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Cyclic Photophosphorylation
	**Related Topics**: Photosynthesis, Light-dependent reactions, Electron transport chain, ATP synthesis
	**Prerequisites**: Basic understanding of photosynthesis and the role of photosystems.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the final electron acceptor in *cyclic* photophosphorylation.
	This implies that the electrons follow a cyclical path.
**Method & Steps**:
	1. **Recall the process of cyclic photophosphorylation**:  In cyclic photophosphorylation, electrons energized in Photosystem I are passed to an electron transport chain, generating ATP.  Unlike non-cyclic photophosphorylation, these electrons do not go to NADP+. Instead, they return to Photosystem I.
		Reasoning: The 'cyclic' nature implies the electrons return to their origin.
	2. **Identify the final acceptor**: After travelling through the electron transport chain, the electrons are returned to Photosystem I, replenishing the electrons lost when light initially excited the chlorophyll molecules.
		Key Point: This cycle focuses solely on ATP production and does not involve Photosystem II or water splitting.
	3. **Confirm the answer**: The electrons originate from and ultimately return to Photosystem I.
		Result: Photosystem I
		Verification: This aligns with the cyclical nature of the process.
## OPTION ANALYSIS
[A] :x: NADP+: NADP+ is the final electron acceptor in *non-cyclic* photophosphorylation. In cyclic photophosphorylation, electrons do not reduce NADP+ to NADPH.
[B] :x: Photosystem II: Photosystem II is not involved in cyclic photophosphorylation. It is the initial electron donor in non-cyclic photophosphorylation.
[C] ✓: Photosystem I:  The electrons, after passing through the electron transport chain, return to Photosystem I, making it the final electron acceptor in cyclic photophosphorylation.  This completes the cycle.
[D] :x: Water: Water is the initial electron donor in non-cyclic photophosphorylation, replacing electrons lost by Photosystem II. It plays no role in cyclic photophosphorylation.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing cyclic and non-cyclic photophosphorylation: Remember that NADP+ is the final acceptor in non-cyclic, while Photosystem I is the final acceptor in cyclic.
		2. Thinking electrons are lost:  The electrons are not lost in cyclic photophosphorylation; they cycle back to Photosystem I.
	**Quick Tips**:
		1. 'Cyclic' implies a return to the starting point: The electrons return to Photosystem I.
		2. Focus on ATP: Cyclic photophosphorylation primarily generates ATP, not NADPH.

B VENKAT · Answer

NADP+

B VENKAT · Answer

Photosystem II

B VENKAT · Answer

The correct Option is "Photosystem I"

B VENKAT · Answer

Water

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