1.The process by which green plants prepare their own food is called:
A) Respiration
B) Transpiration
C) Photosynthesis
D) Digestion
Answer: C
2. Photosynthesis mainly occurs in which part of the plant?
A) Root
B) Stem
C) Leaf
D) Flower
Answer: C
3. The green pigment present in plants is called:
A) Hemoglobin
B) Chlorophyll
C) Melanin
D) Keratin
Answer: B
4. Chlorophyll is present inside which cell organelle?
A) Mitochondria
B) Nucleus
C) Ribosome
D) Chloroplast
Answer: D
5. The gas absorbed by plants during photosynthesis is:
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Answer: C
6. The gas released during photosynthesis is:
A) Carbon dioxide
B) Oxygen
C) Nitrogen
D) Methane
Answer: B
7. The energy source for photosynthesis is:
A) Wind
B) Sunlight
C) Water
D) Soil
Answer: B
8. Water required for photosynthesis is absorbed from the soil by:
A) Leaves
B) Flowers
C) Roots
D) Fruits
Answer: C
9. The tiny pores present on leaves are called:
A) Lenticels
B) Stomata
C) Xylem
D) Phloem
Answer: B
10. The main food produced during photosynthesis is:
A) Protein
B) Fat
C) Glucose
D) Vitamin
Answer: C
11. Excess glucose in plants is stored as:
A) Starch
B) Oil
C) Protein
D) Sugar
Answer: A
12. The process of loss of water vapor from leaves is called:
A) Respiration
B) Transpiration
C) Photosynthesis
D) Germination
Answer: B
13. The upward movement of water in plants occurs through:
A) Phloem
B) Xylem
C) Stomata
D) Cortex
Answer: B
14. The downward transport of food in plants occurs through:
A) Xylem
B) Phloem
C) Root hair
D) Stomata
Answer: B
15. The basic equation of photosynthesis includes carbon dioxide and:
A) Nitrogen
B) Oxygen
C) Water
D) Hydrogen
Answer: C
16. Photosynthesis takes place in which type of cells?
A) Animal cells
B) Fungal cells
C) Plant cells
D) Bacterial cells
Answer: C
17. The opening and closing of stomata is controlled by:
A) Xylem cells
B) Guard cells
C) Phloem cells
D) Epidermal cells
Answer: B
18. During night, photosynthesis:
A) Increases
B) Stops
C) Doubles
D) Continues rapidly
Answer: B
19. The light-dependent reaction of photosynthesis occurs in:
A) Stroma
B) Cytoplasm
C) Thylakoid
D) Nucleus
Answer: C
20. The dark reaction (Calvin cycle) occurs in:
A) Thylakoid
B) Stroma
C) Ribosome
D) Mitochondria
Answer: B
21. Which color of light is most effective for photosynthesis?
A) Green
B) Blue and Red
C) Yellow
D) White only
Answer: B
22. Which factor does NOT affect photosynthesis?
A) Light intensity
B) Temperature
C) Carbon dioxide concentration
D) Sound intensity
Answer: D
23. The process by which plants make food using sunlight is an example of:
A) Anabolic reaction
B) Catabolic reaction
C) Digestion
D) Fermentation
Answer: A
24. Which part of the leaf contains the highest number of chloroplasts?
A) Upper epidermis
B) Palisade mesophyll
C) Lower epidermis
D) Vein
Answer: B
25. The opening of stomata allows entry of:
A) Oxygen only
B) Carbon dioxide
C) Nitrogen only
D) Hydrogen
Answer: B
26. Which plant cell organelle is known as the “kitchen of the cell”?
A) Mitochondria
B) Chloroplast
C) Nucleus
D) Ribosome
Answer: B
27. Photosynthesis helps maintain the balance of:
A) Nitrogen cycle
B) Water cycle
C) Oxygen and carbon dioxide
D) Mineral salts
Answer: C
28. Which raw material of photosynthesis comes from air?
A) Water
B) Oxygen
C) Carbon dioxide
D) Glucose
Answer: C
29. Which structure helps in absorption of water from soil?
A) Root hair
B) Stem
C) Leaf
D) Bud
Answer: A
30. The overall product of photosynthesis provides energy for:
A) Plants only
B) Animals only
C) All living organisms
D) Fungi only
Answer: C