50 Most Important NEET PYQs of Chapter 13: Photosynthesis in Higher Plants – Part 2 (Q26–50) | By neetpyqall
🌿 50 Most Important NEET PYQs of Chapter 13: Photosynthesis in Higher Plants – Part 2 (Q26–50) | By neetpyqall
This is Part 2 (Q26 to Q50) of the most important NEET Previous Year Questions from Chapter 13: Photosynthesis in Higher Plants. These questions are selected for maximum relevance and detailed to help you retain, revise, and apply.
26. What is the first stable compound formed during C₄ cycle?
A) PGA
B) Malic acid
C) OAA (Oxaloacetic acid)
D) PEP
✅ Answer: C) OAA (Oxaloacetic acid)
Explanation: OAA is the first stable 4-carbon compound formed in the mesophyll cells of C₄ plants.
27. In cyclic photophosphorylation, electrons are:
A) Lost after passing through ETS
B) Returned to chlorophyll
C) Used to reduce NADP⁺
D) Used in splitting water
✅ Answer: B) Returned to chlorophyll
Explanation: In cyclic photophosphorylation, electrons cycle back to the same chlorophyll molecule, producing ATP only.
28. The site of photophosphorylation is:
A) Cytoplasm
B) Stroma
C) Thylakoid membrane
D) Nucleus
✅ Answer: C) Thylakoid membrane
Explanation: ATP is synthesized during photophosphorylation in the thylakoid membrane.
29. Which gas is evolved during light reaction?
A) CO₂
B) O₂
C) H₂
D) N₂
✅ Answer: B) O₂
Explanation: Water is split during the light reaction to release oxygen.
30. Which plant type minimizes photorespiration by spatial separation?
A) C₃
B) C₄
C) CAM
D) Bryophytes
✅ Answer: B) C₄
Explanation: C₄ plants have spatial separation of carbon fixation and the Calvin cycle, reducing photorespiration.
31. Which one is a 3-carbon compound?
A) RuBP
B) PGA
C) OAA
D) Glucose
✅ Answer: B) PGA
Explanation: 3-Phosphoglyceric acid (PGA) is a 3-carbon molecule formed in the Calvin cycle.
32. Which pigment is most abundant in photosystem II?
A) Chlorophyll a
B) Chlorophyll b
C) Carotenoids
D) P680
✅ Answer: D) P680
Explanation: P680 is the chlorophyll a molecule found at the reaction center of PSII.
33. CO₂ fixation in CAM plants takes place:
A) At night
B) During the day
C) Continuously
D) Only under light
✅ Answer: A) At night
Explanation: CAM plants fix CO₂ at night to prevent water loss.
34. C₄ pathway is also known as:
A) Hatch-Slack pathway
B) Calvin-Benson cycle
C) Hill reaction
D) Blackman’s cycle
✅ Answer: A) Hatch-Slack pathway
Explanation: Named after its discoverers, the Hatch-Slack pathway is the C₄ photosynthetic pathway.
35. Which of the following statements is correct for light reaction?
A) Occurs in stroma
B) Requires dark
C) Produces ATP and NADPH
D) Fixes CO₂
✅ Answer: C) Produces ATP and NADPH
Explanation: Light reaction yields ATP and NADPH used in the dark reaction.
36. Chlorophyll a shows maximum absorption in:
A) Green and red region
B) Blue and red region
C) Yellow and green region
D) Blue and yellow region
✅ Answer: B) Blue and red region
Explanation: Chlorophyll a absorbs blue and red light most effectively.
37. Water is split during:
A) Electron transport in mitochondria
B) Calvin cycle
C) Light reaction
D) Photorespiration
✅ Answer: C) Light reaction
Explanation: Water is photolysed in Photosystem II during the light reaction.
38. The source of electrons in photosynthesis is:
A) Oxygen
B) Water
C) CO₂
D) NADPH
✅ Answer: B) Water
Explanation: Electrons are released from water molecules during photolysis.
39. The final hydrogen acceptor in non-cyclic photophosphorylation is:
A) NADP⁺
B) ATP
C) H₂O
D) ADP
✅ Answer: A) NADP⁺
Explanation: NADP⁺ accepts electrons and gets reduced to NADPH.
40. Which cell in C₄ plant contains Rubisco?
A) Mesophyll
B) Guard cell
C) Bundle sheath
D) Palisade cell
✅ Answer: C) Bundle sheath
Explanation: In C₄ plants, Rubisco is confined to the bundle sheath cells, avoiding oxygen.
41. The end product of the light reaction is:
A) CO₂
B) NADH
C) ATP and NADPH
D) Pyruvate
✅ Answer: C) ATP and NADPH
Explanation: ATP and NADPH power the Calvin cycle.
42. Non-cyclic photophosphorylation involves:
A) PS I only
B) PS II only
C) PS I and PS II
D) None
✅ Answer: C) PS I and PS II
Explanation: Both Photosystems are active in non-cyclic electron flow.
43. The Calvin cycle operates in:
A) Grana
B) Stroma
C) Inner membrane
D) Cytoplasm
✅ Answer: B) Stroma
Explanation: Calvin cycle reactions take place in the chloroplast stroma.
44. The energy-rich molecule formed during photosynthesis is:
A) Glucose
B) ATP
C) NADPH
D) All of these
✅ Answer: D) All of these
Explanation: All are produced either directly or indirectly during photosynthesis.
45. Chlorophyll b functions as:
A) Reaction center
B) Antenna pigment
C) Structural pigment
D) Enzyme
✅ Answer: B) Antenna pigment
Explanation: Chlorophyll b captures light and passes energy to chlorophyll a.
46. The main adaptive feature of CAM plants is:
A) Large leaves
B) High water requirement
C) Stomata open at night
D) Thick cuticle
✅ Answer: C) Stomata open at night
Explanation: CAM plants conserve water by fixing CO₂ at night.
47. What happens in the absence of light during photosynthesis?
A) ATP and NADPH formation continues
B) Calvin cycle continues using stored ATP
C) No ATP or NADPH formed
D) Glucose production continues
✅ Answer: C) No ATP or NADPH formed
Explanation: Light is essential for the photophosphorylation process.
48. The compound that fixes CO₂ in mesophyll of C₄ plants is:
A) RuBP
B) OAA
C) PEP
D) PGA
✅ Answer: C) PEP
Explanation: PEP reacts with CO₂ in mesophyll cells of C₄ plants.
49. Maximum photosynthesis occurs in:
A) Green light
B) Red light
C) Yellow light
D) Infrared
✅ Answer: B) Red light
Explanation: Red light is highly absorbed by chlorophyll for maximum photosynthesis.
50. Final product of Calvin cycle is:
A) Pyruvate
B) Glucose
C) Fructose
D) PGA
✅ Answer: B) Glucose
Explanation: Calvin cycle ultimately produces glucose using CO₂, ATP, and NADPH.
That's a wrap on Chapter 13: Photosynthesis in Higher Plants (Q1–50)! 🌱
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