The Question is from neet-botany photosynthesis-in-higher-plants light-phase, 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

NEET Botany Photosynthesis in Higher Plants Light Phase MCQs

Select Topic

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company