Padhai STEM Practice Questions →
NCERT Solutions › Biology › Chapter 13

Chapter 13: Photosynthesis

NCERT Solutions for CBSE Class 10 Biology — 20 solved questions with detailed explanations.

20
Questions
0
Topics

Solved Questions

Q1. The site of light reactions in chloroplasts is:

Difficulty: Easy · Topic: Light Reactions

Solution

Light reactions occur on thylakoid membranes (where photosystems I and II, ETC, and ATP synthase are located).

Q2. The CO₂ acceptor in the Calvin cycle (C₃ pathway) is:

Difficulty: Easy · Topic: Calvin Cycle

Solution

RuBP (ribulose-1,5-bisphosphate) is the CO₂ acceptor in C₃ cycle. RuBisCO catalyzes the fixation.

Q3. The O₂ released in photosynthesis comes from:

Difficulty: Easy · Topic: Photosynthesis

Solution

water (photolysis).

Q4. Photorespiration occurs in:

Difficulty: Easy · Topic: Photosynthesis

Solution

C3 plants.

Q5. Photosystem I has reaction centre at:

Difficulty: Easy · Topic: Photosynthesis

Solution

P700.

Q6. How many molecules of ATP and NADPH are required to fix 6 CO₂ in the Calvin cycle?

Difficulty: Easy-Medium · Topic: ATP Requirements

Solution

For each CO₂: 3 ATP + 2 NADPH. For 6 CO₂: 18 ATP + 12 NADPH.

Q7. C4 plants fix CO₂ first into:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

OAA (oxaloacetate, 4-carbon).

Q8. CAM plants open stomata at:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

night.

Q9. Cyclic photophosphorylation involves:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

only PS I.

Q10. The first stable product of C3 cycle is:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

3-PGA (3-phosphoglyceric acid).

Q11. Photosystem II has reaction centre at:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

P680.

Q12. Light reactions occur in:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

thylakoid membrane.

Q13. Dark reactions occur in:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

stroma of chloroplast.

Q14. PS I has P700 absorbing:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

700 nm light.

Q15. PS II has P680 absorbing:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

680 nm light.

Q16. NADPH is produced in:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

light reactions.

Q17. CO₂ fixation occurs in:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

Calvin cycle (dark reactions).

Q18. C3 plants fix CO₂ first into:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

PGA (3-phosphoglycerate).

Q19. CAM plants keep stomata closed during:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

day.

Q20. Kranz anatomy is found in:

Difficulty: Easy-Medium · Topic: Photosynthesis

Solution

C4 plants.

Other Chapters in Biology

Ch 1: The Living WorldCh 2: Biological ClassificationCh 3: Plant KingdomCh 4: Animal KingdomCh 5: Morphology of PlantsCh 6: Anatomy of PlantsCh 7: Structural Organisation in AnimalsCh 8: Cell Unit of LifeCh 9: BiomoleculesCh 10: Cell CycleCh 11: Transport in PlantsCh 12: Mineral NutritionCh 14: Respiration in PlantsCh 15: Plant GrowthCh 16: Digestion & AbsorptionCh 17: Breathing & Gas ExchangeCh 18: Body Fluids & CirculationCh 19: Excretory ProductsCh 20: Locomotion & MovementCh 21: Neural ControlCh 22: Chemical Coordination

Want to practice these questions interactively?

Get instant feedback, track progress, and improve with adaptive practice.

Start Practicing Free →