50 Most Important NEET PYQs of Chapter 13: Photosynthesis in Higher Plants – Part 1 (Q1–25) | By neetpyqall
🌿 50 Most Important NEET PYQs of Chapter 13: Photosynthesis in Higher Plants – Part 1 (Q1–25) | By neetpyqall
Get ready to master one of the most frequently asked and high-weightage chapters of NEET – Photosynthesis in Higher Plants. Below are 25 highly important Previous Year Questions (PYQs) with detailed explanations to help you gain conceptual clarity and improve accuracy in the exam.
1. Which of the following is a correct statement regarding photosynthesis?
A) Oxygen is consumed
B) CO₂ is released
C) It is an exothermic reaction
D) It is an endothermic reaction
✅ Answer: D) It is an endothermic reaction
Explanation: Photosynthesis requires energy (sunlight) to convert CO₂ and H₂O into glucose, making it an endothermic process.
2. In which part of the chloroplast does the light reaction occur?
A) Stroma
B) Outer membrane
C) Grana (thylakoid membranes)
D) Inner membrane
✅ Answer: C) Grana (thylakoid membranes)
Explanation: Light-dependent reactions occur in the grana where chlorophyll captures light energy.
3. Which of the following is the primary electron acceptor in Photosystem II?
A) P700
B) P680
C) Plastoquinone
D) Ferredoxin
✅ Answer: C) Plastoquinone
Explanation: Plastoquinone accepts electrons from P680 during the photolysis of water.
4. The enzyme Rubisco is found in:
A) Thylakoid
B) Grana
C) Stroma
D) Cytoplasm
✅ Answer: C) Stroma
Explanation: Rubisco is involved in the Calvin cycle (dark reaction) that takes place in the stroma.
5. The process of photorespiration requires:
A) Mitochondria and chloroplast
B) Chloroplast and peroxisome
C) Chloroplast, peroxisome, and mitochondria
D) Only chloroplast
✅ Answer: C) Chloroplast, peroxisome, and mitochondria
Explanation: All three organelles are involved in the photorespiratory pathway.
6. Hill reaction occurs in:
A) Stroma
B) Cytoplasm
C) Grana
D) Outer membrane
✅ Answer: C) Grana
Explanation: The Hill reaction involves photolysis of water and occurs in the grana.
7. Which plant is an example of C₄ photosynthesis?
A) Wheat
B) Rice
C) Maize
D) Pea
✅ Answer: C) Maize
Explanation: Maize is a C₄ plant, showing Kranz anatomy and high photosynthetic efficiency.
8. Photolysis of water in light reaction releases:
A) ATP only
B) NADPH only
C) O₂, electrons, and protons
D) Glucose
✅ Answer: C) O₂, electrons, and protons
Explanation: Photolysis splits water into O₂, protons (H⁺), and electrons.
9. Z-scheme of photosynthesis refers to:
A) Non-cyclic phosphorylation
B) Cyclic phosphorylation
C) Photorespiration
D) Photolysis
✅ Answer: A) Non-cyclic phosphorylation
Explanation: The Z-scheme represents the movement of electrons from water to NADP⁺ in light-dependent reactions.
10. During cyclic photophosphorylation:
A) Both ATP and NADPH are formed
B) Only ATP is formed
C) Only NADPH is formed
D) No energy molecules are formed
✅ Answer: B) Only ATP is formed
Explanation: In cyclic photophosphorylation, only ATP is generated; NADPH is not produced.
11. Which is the first stable product of C₃ cycle?
A) PGA
B) PEP
C) RuBP
D) Malic acid
✅ Answer: A) PGA
Explanation: 3-phosphoglyceric acid (PGA) is the first stable product in the Calvin cycle.
12. Calvin cycle occurs in:
A) Grana
B) Stroma
C) Cytoplasm
D) Mitochondria
✅ Answer: B) Stroma
Explanation: The dark reaction or Calvin cycle takes place in the stroma of chloroplasts.
13. Which of the following statements is true for C₄ plants?
A) Photorespiration is high
B) More efficient CO₂ fixation
C) No Kranz anatomy
D) Lower rate of photosynthesis
✅ Answer: B) More efficient CO₂ fixation
Explanation: C₄ plants have Kranz anatomy and show less photorespiration, leading to higher photosynthetic efficiency.
14. Bundle sheath cells are a characteristic feature of:
A) C₃ plants
B) C₄ plants
C) CAM plants
D) Hydrophytes
✅ Answer: B) C₄ plants
Explanation: Bundle sheath cells are involved in the Calvin cycle in C₄ plants.
15. Which pigment acts as a reaction center in Photosystem I?
A) P680
B) P700
C) Carotenoid
D) Xanthophyll
✅ Answer: B) P700
Explanation: P700 is the reaction center in Photosystem I.
16. Which light is most effective in photosynthesis?
A) Green
B) Yellow
C) Blue and red
D) White
✅ Answer: C) Blue and red
Explanation: Chlorophyll absorbs blue and red light most efficiently for photosynthesis.
17. Photophosphorylation is:
A) Formation of ATP during respiration
B) Formation of ATP in mitochondria
C) Formation of ATP using light energy
D) Breakdown of ATP
✅ Answer: C) Formation of ATP using light energy
Explanation: Photophosphorylation refers to ATP synthesis in the chloroplast using light energy.
18. What is the role of NADP⁺ in photosynthesis?
A) Splits water
B) Traps sunlight
C) Electron acceptor
D) Fixes CO₂
✅ Answer: C) Electron acceptor
Explanation: NADP⁺ accepts electrons and becomes reduced to NADPH during light reactions.
19. Which pigment is present in all photosynthetic organisms?
A) Chlorophyll b
B) Carotenoids
C) Chlorophyll a
D) Phycocyanin
✅ Answer: C) Chlorophyll a
Explanation: Chlorophyll a is the universal pigment present in all photosynthetic organisms.
20. Photorespiration occurs due to:
A) Low oxygen
B) High CO₂
C) Oxygenase activity of Rubisco
D) High ATP
✅ Answer: C) Oxygenase activity of Rubisco
Explanation: Under high O₂ and low CO₂ conditions, Rubisco acts as oxygenase, leading to photorespiration.
21. In C₄ plants, the primary CO₂ acceptor is:
A) PEP
B) RuBP
C) OAA
D) PGA
✅ Answer: A) PEP
Explanation: Phosphoenolpyruvate (PEP) is the primary CO₂ acceptor in C₄ plants.
22. What is the net product of the light reaction?
A) ATP and Glucose
B) ATP and O₂
C) ATP, NADPH, and O₂
D) ATP and CO₂
✅ Answer: C) ATP, NADPH, and O₂
Explanation: These molecules are generated in light-dependent reactions to fuel the Calvin cycle.
23. In CAM plants, CO₂ is fixed:
A) In mesophyll cells during the night
B) In bundle sheath cells during the day
C) In chloroplast during the day
D) In mitochondria at night
✅ Answer: A) In mesophyll cells during the night
Explanation: CAM plants fix CO₂ at night to minimize water loss.
24. Which structure helps to trap sunlight in the chloroplast?
A) Grana
B) Stroma
C) Lamellae
D) Envelope
✅ Answer: A) Grana
Explanation: Grana (stacked thylakoids) contain pigments that absorb sunlight.
25. The main function of the Calvin cycle is:
A) Splitting water
B) Absorbing light
C) Fixing CO₂ into carbohydrates
D) Producing O₂
✅ Answer: C) Fixing CO₂ into carbohydrates
Explanation: The Calvin cycle uses ATP and NADPH to convert CO₂ into glucose.
Stay tuned for Part 2 (Q26–50) of Chapter 13: Photosynthesis in Higher Plants, coming next!
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