Q1. What is photosynthesis?
Answer: The process by which green plants make their own food.
It uses sunlight, water, and carbon dioxide.
Q2. Which pigment is essential for photosynthesis?
Answer: Chlorophyll
It gives plants their green colour.
Q3. Which gas is taken in by plants during photosynthesis?
Answer: Carbon dioxide
It enters the leaf through stomata.
Q4. Which gas is released during photosynthesis?
Answer: Oxygen
It supports respiration and burning.
Q5. In which part of the plant does photosynthesis mainly occur?
Answer: Leaf
It is flat and green in colour.
Q6. Where in the cell does photosynthesis take place?
Answer: Chloroplast
It contains chlorophyll.
Q7. What is the source of energy for photosynthesis?
Answer: Sunlight
It comes from the Sun.
Q8. Which raw material is absorbed from soil for photosynthesis?
Answer: Water
It is absorbed by roots.
Q9. Which carbohydrate is produced during photosynthesis?
Answer: Glucose
It is a simple sugar.
Q10. In what form is food stored in plants?
Answer: Starch
It is insoluble in water.
Q11. Which tiny openings allow gas exchange in leaves?
Answer: Stomata
They open and close with guard cells.
Q12. Which process splits water using light energy?
Answer: Photolysis
It occurs during light reaction.
Q13. Which part of chloroplast contains grana?
Answer: Thylakoid
It is a disc-like structure.
Q14. Which reaction of photosynthesis occurs in sunlight?
Answer: Light reaction
It needs light energy.
Q15. Which reaction of photosynthesis occurs without direct sunlight?
Answer: Dark reaction
It occurs in the stroma.
Q16. Which experiment proves starch formation in leaves?
Answer: Sachs experiment
Iodine turns starch blue-black.
Q17. Which factor increases the rate of photosynthesis?
Answer: Increased light intensity
Q18. Which plant does not perform photosynthesis?
Answer: Cuscuta
It is a parasitic plant.
Q19. Which energy change occurs in photosynthesis?
Answer: Light energy to chemical energy
Energy is stored in glucose.
Q20. Why is photosynthesis important for life?
Answer: It provides food and oxygen