Sample Questions — What is Light Reaction?
Try 5 questions below from What is Light Reaction?. Get all 30 in the MedicNEET app.
MCQ
Which of the following correctly describes the energy flow during the light reaction of photosynthesis?
✅ Correct Answer: A
Light excites electrons in chlorophyll; the energy is transferred through an electron transport chain to synthesize ATP (via photophosphorylation) and reduce NADP⁺ to NADPH.
MCQ
Match the Light Reaction Events with their Descriptions:
COLUMN A
A. Light absorption
B. Water splitting
C. ATP formation
D. NADPH formation
COLUMN B
1. Pigments in thylakoids
2. Energy storage
3. Source of oxygen evolution
4. Reducing power for CO₂ fixation
✅ Correct Answer: D
Light absorption is carried out by pigment molecules present in thylakoid membranes. Water splitting provides electrons and protons, releasing oxygen as a by-product. ATP is formed by photophosphorylation and acts as an energy currency. NADPH provides reducing power required for the fixation of CO₂ during the Calvin cycle.
👆 Want all 30 What is Light Reaction? questions? Get them in the app.
Download MedicNEET →
MCQ
Which two products of the light reaction are essential for the Calvin cycle?
✅ Correct Answer: C
These products fuel the biochemical reactions of the Calvin cycle.
MCQ
What term is used to describe the light-dependent synthesis of ATP?
✅ Correct Answer: B
The process of ATP formation during the light reaction using light energy is called photophosphorylation.
MCQ
What is the primary energy currency formed during the light reaction?
✅ Correct Answer: A
ATP is generated during the light reaction via photophosphorylation.
Practice All 30 Questions from What is Light Reaction?
You've seen 5 sample questions. Get all 30 with detailed NCERT-mapped explanations in the MedicNEET app.
📲 Download MedicNEET FreeAvailable on Android • 12,771 Biology Questions • 3 Formats