Question:

Which of the following statements is incorrect

Updated On: Apr 14, 2025
  • 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
Hide Solution
collegedunia
Verified By Collegedunia

The Correct Option is A

Solution and Explanation

Cyclic photophosphorylation actually involves only Photosystem I (PS I), not both PS I and PS II. In cyclic photophosphorylation, electrons are cyclically passed through PS I to generate ATP without the production of NADPH. PS II is not involved in this process.

So, the correct option is (A): Cyclic photophosphorylation involves both PS I and PS II.

Was this answer helpful?
0
0

Top Questions on Photosynthesis in higher plants

View More Questions

Questions Asked in NEET exam

View More Questions

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.