Which of the following statements is incorrect
- Cyclic photophosphorylation involves both PS I and PS II.
- Both ATP and NADPH+H+ are synthesized during non-cyclic photophosphorylation
- Stroma lamellae have PS I only and lack NADP reductase
- Grana lamellae have both PS I and PS II
The Correct Option is A
Solution and Explanation
To determine which statement is incorrect, let's analyze each option based on photosynthesis concepts:
- Cyclic photophosphorylation involves both PS I and PS II.
- Analysis: Cyclic photophosphorylation involves only photosystem I (PS I). It does not involve photosystem II (PS II). In cyclic photophosphorylation, electrons are cycled back to PS I, and only ATP is produced, not NADPH.
- Conclusion: This statement is incorrect because PS II is not involved in cyclic photophosphorylation.
- Both ATP and NADPH+H+ are synthesized during non-cyclic photophosphorylation.
- Analysis: Non-cyclic photophosphorylation involves both PS I and PS II and leads to the production of ATP and NADPH. Electrons are transferred from water to NADP+, synthesizing NADPH along with ATP generation through photophosphorylation.
- Conclusion: This statement is correct.
- Stroma lamellae have PS I only and lack NADP reductase.
- Analysis: Stroma lamellae contain PS I but not PS II, aligning with their role in cyclic photophosphorylation, and they do lack NADP reductase, which is part of the non-cyclic electron transport chain.
- Conclusion: This statement is correct.
- Grana lamellae have both PS I and PS II.
- Analysis: Grana lamellae have both PS I and PS II. These structures are responsible for non-cyclic photophosphorylation, which involves both photosystems to generate ATP and NADPH.
- Conclusion: This statement is correct.
After evaluating the options, it is clear that the incorrect statement is: "Cyclic photophosphorylation involves both PS I and PS II."
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Concepts Used:
Electron Transport System
The electron transport chain or system is the sequence of electron carriers, enzymes, and cytochrome that passes electrons from one to another through the redox reaction. It is electron transport-linked phosphorylation.
It contains flavin nucleotides (FAD), nicotinamide adenine dinucleotide (NAD), coenzyme Q, and cytochromes localized in F1 particles of mitochondria. It occurs in the inner mitochondrial membrane along with cristae.
In this process five (5) complexes are involved namely, I- NADH-UQ reductase, II- Succinate-UQ reductase, III- UQH2 -cytochrome C reductase, IV- Cytochrome C oxidase, and V is connected with F0−F1 particles.
In this process, NAD and FAD are minimized.
Steps:
- Redox at complex I: Four (4) protons are pumped from the matrix to intermembrane space.
- Redox at complex II: Coenzyme Q collects the electrons from complex I and II, and goes to complex III.
- Redox of complex III: Four (4) protons are again pumped from matrix to intermembrane space and cytochrome C transports electrons to the complex IV.
- Redox of complex IV: Two (2) protons are pumped from the matrix to intermembrane space and the formation of water occurs in the matrix.
- ATP synthase action: It pumps protons from intermembrane space to matrix and generates ATP. It is associated with oxidative phosphorylation.