Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of organic molecules. Here are 10 MCQs on photosynthesis with their answer keys:
Which of the following are the reactants of photosynthesis?
A) Carbon dioxide and water
B) Oxygen and glucose
C) Nitrogen and oxygen
D) Water and glucose
Answer: A
Which of the following are the products of photosynthesis?
A) Carbon dioxide and water
B) Oxygen and glucose
C) Nitrogen and oxygen
D) Water and glucose
Answer: B
Which of the following is the pigment that absorbs light energy in photosynthesis?
A) Chlorophyll
B) Carotenoid
C) Anthocyanin
D) Phycocyanin
Answer: A
In which part of the plant does photosynthesis occur?
A) Leaves
B) Roots
C) Stem
D) Flowers
Answer: A
Which of the following is the process by which light energy is converted into chemical energy in photosynthesis?
A) Photolysis
B) Photosynthesis
C) Photorespiration
D) Phototropism
Answer: B
Which of the following is the source of oxygen released during photosynthesis?
A) Carbon dioxide
B) Water
C) Glucose
D) Sunlight
Answer: B
Which of the following is the process by which plants close their stomata to prevent water loss?
A) Transpiration
B) Absorption
C) Guttation
D) Stomatal regulation
Answer: D
Which of the following is the molecule that carries energy in the form of electrons during photosynthesis?
A) Chlorophyll
B) ATP
C) NADPH
D) Glucose
Answer: C
Which of the following is the process by which plants convert carbon dioxide into organic compounds during photosynthesis?
A) Calvin cycle
B) Krebs cycle
C) Glycolysis
D) Electron transport chain
Answer: A
Which of the following is the type of photosynthesis in which plants use the C4 pathway to fix carbon dioxide?
A) C3 photosynthesis
B) CAM photosynthesis
C) C4 photosynthesis
D) Both A and B
Answer: C