GK Quiz on Photosynthesis: 20 Important Questions and Answers for Students

Photosynthesis is a vital biological process through which green plants, algae, and certain bacteria produce their own food using sunlight, water, and carbon dioxide. It plays a crucial role in maintaining life on Earth by releasing oxygen into the atmosphere and supporting the food chain. This GK Quiz on Photosynthesis features 20 important questions and answers designed to help students improve their science knowledge, understand the role of chlorophyll and sunlight, and prepare for school exams, competitive tests, and general awareness quizzes.

1. What is photosynthesis?
A) Breathing process in plants
B) Food-making process in plants
C) Water absorption process
D) Seed formation process
Answer: B) Food-making process in plants

2. Which gas do plants absorb during photosynthesis?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Hydrogen
Answer: C) Carbon Dioxide

3. Which gas is released during photosynthesis?
A) Carbon Dioxide
B) Oxygen
C) Nitrogen
D) Helium
Answer: B) Oxygen

4. Which pigment is essential for photosynthesis?
A) Hemoglobin
B) Melanin
C) Chlorophyll
D) Keratin
Answer: C) Chlorophyll

5. Chlorophyll gives plants which color?
A) Red
B) Blue
C) Yellow
D) Green
Answer: D) Green

6. Photosynthesis mainly takes place in which part of the plant?
A) Root
B) Stem
C) Leaf
D) Flower
Answer: C) Leaf

7. What is the primary source of energy for photosynthesis?
A) Wind
B) Sunlight
C) Water
D) Soil
Answer: B) Sunlight

8. Water used in photosynthesis is absorbed through the:
A) Leaves
B) Flowers
C) Fruits
D) Roots
Answer: D) Roots

9. Which cell organelle is the site of photosynthesis?
A) Nucleus
B) Mitochondria
C) Chloroplast
D) Ribosome
Answer: C) Chloroplast

10. Photosynthesis helps produce:
A) Protein only
B) Vitamins only
C) Glucose (food)
D) Minerals
Answer: C) Glucose (food)

11. Which part of sunlight is mainly used in photosynthesis?
A) Visible light
B) Infrared rays
C) X-rays
D) Gamma rays
Answer: A) Visible light

12. The tiny pores on leaves are called:
A) Veins
B) Stomata
C) Petals
D) Sepals
Answer: B) Stomata

13. Through which structures does carbon dioxide enter leaves?
A) Roots
B) Stem
C) Stomata
D) Flowers
Answer: C) Stomata

14. The food produced during photosynthesis is stored mainly as:
A) Fat
B) Protein
C) Starch
D) Minerals
Answer: C) Starch

15. Which of the following is NOT required for photosynthesis?
A) Sunlight
B) Water
C) Carbon Dioxide
D) Nitrogen Gas
Answer: D) Nitrogen Gas

16. Photosynthesis occurs mostly during:
A) Night
B) Daytime
C) Evening only
D) Winter only
Answer: B) Daytime

17. Which scientist discovered the importance of sunlight in photosynthesis?
A) Isaac Newton
B) Jan Ingenhousz
C) Albert Einstein
D) Galileo Galilei
Answer: B) Jan Ingenhousz

18. Which organisms besides plants can perform photosynthesis?
A) Fungi
B) Algae
C) Earthworms
D) Amoeba
Answer: B) Algae

19. What is the main carbohydrate produced in photosynthesis?
A) Glucose
B) Fructose
C) Lactose
D) Maltose
Answer: A) Glucose

20. Photosynthesis helps maintain the balance of:
A) Gold and Silver
B) Oxygen and Carbon Dioxide
C) Salt and Sugar
D) Water and Oil
Answer: B) Oxygen and Carbon Dioxide

21. Which of the following can reduce photosynthesis?
A) Lack of sunlight
B) Adequate water
C) Healthy leaves
D) Proper temperature
Answer: A) Lack of sunlight

22. The process of converting light energy into chemical energy is called:
A) Respiration
B) Germination
C) Photosynthesis
D) Transpiration
Answer: C) Photosynthesis

23. Plants are known as:
A) Consumers
B) Producers
C) Decomposers
D) Scavengers
Answer: B) Producers

24. Which element is present at the center of a chlorophyll molecule?
A) Iron
B) Calcium
C) Magnesium
D) Sodium
Answer: C) Magnesium

25. Why is photosynthesis important for life on Earth?
A) It creates rocks
B) It produces oxygen and food
C) It causes rainfall
D) It forms mountains
Answer: B) It produces oxygen and food