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

Question

In light reaction, plastoquinone facilitates the transfer of electrons from

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [A]
## CONCEPT FRAMEWORK
	**Primary Concept**: Electron transport chain in light reactions of photosynthesis.
	**Related Topics**: Photosystems (PS-I and PS-II), cytochrome b6f complex, plastoquinone, ATP synthesis, NADPH synthesis.
	**Prerequisites**: Basic understanding of photosynthesis and its light-dependent reactions.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the role of plastoquinone in electron transfer during the light reactions.

**Method & Steps**:
	1. Recall the sequence of electron transfer in the light-dependent reactions of photosynthesis.
		Reasoning: The electron transport chain involves several protein complexes and mobile electron carriers. Plastoquinone is one of these carriers.
	2. Identify the position of plastoquinone in the electron transport chain.
		Working: Plastoquinone (PQ) is a mobile carrier that accepts electrons from PS-II and transfers them to the cytochrome b6f complex.
	3. Determine the answer based on the identified electron transfer.
		Result: Plastoquinone facilitates electron transfer from PS-II to the cytochrome b6f complex.
		Verification: The electron transport chain sequence is PS-II -> Plastoquinone -> Cytochrome b6f complex -> Plastocyanin -> PS-I -> Ferredoxin -> NADP+ reductase.
 ## OPTION ANALYSIS
[A] ✓: Correct. Plastoquinone transfers electrons from PS-II to the cytochrome b6f complex.
[B] :x: Incorrect. The transfer of electrons from cytochrome b6f complex to PS-I is mediated by plastocyanin.
[C] :x: Incorrect. The electron transfer from PS-I to NADP+ is mediated by ferredoxin and NADP+ reductase.
[D] :x: Incorrect. ATP synthase is involved in proton gradient-driven ATP synthesis, not electron transport from PS-I.
 ## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Confusing the order of electron carriers. [How to avoid]: Memorize the correct sequence of the electron transport chain in the light reactions.
		2.[Error 2]: Confusing the function of ATP synthase with electron transport. [How to avoid]: Understand that ATP synthase uses the proton gradient to produce ATP, not electron transport.
	**Quick Tips**:
		1.[Helpful shortcut]: Visualize the Z-scheme of photosynthesis to trace the electron flow.
		2.[Memory aid]: Remember PQ as the mobile electron carrier after PS-II.

B VENKAT · Answer

The correct Option is "PS-II to ${\rm{Cyt}}{{\rm{b}}_{\rm{6}}}{\rm{f}}$ complex"

B VENKAT · Answer

${\rm{Cyt}}{{\rm{b}}_{\rm{6}}}{\rm{f}}$ complex to PS-I

B VENKAT · Answer

PS-I to ${\rm{NAD}}{{\rm{P}}^{\rm{ + }}}$

B VENKAT · Answer

PS-I to ATP synthase

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