Photosynthesis and Cellular Respiration Quiz. Photosynthesis and cellular respiration are two important biological processes that enable living organisms to produce and use energy. Photosynthesis allows green plants to manufacture food using sunlight, carbon dioxide, and water, while cellular respiration helps plants and animals release energy from this food for growth, movement, and other life activities. Together, these processes maintain energy flow and balance in living systems.
Photosynthesis and Cellular Respiration Quiz
1. Photosynthesis is the process by which green plants
A. Release oxygen for respiration
B. Manufacture food using sunlight
C. Absorb minerals from soil
D. Produce carbon dioxide
2. The green pigment responsible for photosynthesis is
A. Haemoglobin
B. Chlorophyll
C. Melanin
D. Carotene
3. Photosynthesis mainly takes place in the
A. Mitochondria
B. Ribosomes
C. Chloroplast
D. Nucleus
4. The raw materials needed for photosynthesis are
A. Oxygen and glucose
B. Carbon dioxide and water
C. Nitrogen and minerals
D. Protein and fats
5. The main source of energy for photosynthesis is
A. Wind
B. Electricity
C. Sunlight
D. Heat
Photosynthesis and Cellular Respiration Quiz
6. The gas released during photosynthesis is
A. Carbon dioxide
B. Nitrogen
C. Oxygen
D. Hydrogen
7. The food produced during photosynthesis is
A. Protein
B. Fat
C. Glucose
D. Starch
8. Which part of the chloroplast contains chlorophyll?
A. Stroma
B. Thylakoid membrane
C. Matrix
D. Cristae
9. The stage of photosynthesis that requires light is called
A. Dark reaction
B. Calvin cycle
C. Light reaction
D. Krebs cycle
10. The dark reaction of photosynthesis takes place in the
A. Thylakoid
B. Grana
C. Stroma
D. Cytoplasm
Photosynthesis and Cellular Respiration Quiz
11. Cellular respiration is the process by which cells
A. Produce oxygen
B. Store energy
C. Release energy from food
D. Absorb sunlight
12. The main site of cellular respiration is the
A. Ribosome
B. Chloroplast
C. Mitochondrion
D. Nucleus
13. The main product of respiration used for energy is
A. Glucose
B. ATP
C. Oxygen
D. Carbon dioxide
14. The first stage of respiration that occurs in the cytoplasm is
A. Krebs cycle
B. Electron transport chain
C. Glycolysis
D. Calvin cycle
15. Which gas is required for aerobic respiration?
A. Nitrogen
B. Carbon dioxide
C. Oxygen
D. Hydrogen
16. The waste products of aerobic respiration are
A. Oxygen and glucose
B. Carbon dioxide and water
C. Lactic acid and alcohol
D. Nitrogen and ammonia
17. Anaerobic respiration in humans produces
A. Alcohol and carbon dioxide
B. Lactic acid and energy
C. Water and oxygen
D. Glucose and ATP
18. Which organism can carry out both photosynthesis and respiration?
A. Mushroom
B. Bacteria
C. Green plants
D. Virus
19. The energy from sunlight is converted into chemical energy in the form of
A. ATP
B. Protein
C. Glucose
D. Water
20. During respiration, glucose is broken down to release
A. Light
B. Energy
C. Minerals
D. Vitamins
Photosynthesis and Cellular Respiration Quiz
21. The exchange of gases in leaves occurs through
A. Lenticels
B. Stomata
C. Roots
D. Veins
22. Which stage of respiration produces the most ATP?
A. Glycolysis
B. Krebs cycle
C. Electron transport chain
D. Fermentation
23. The process that links photosynthesis and respiration is the
A. Carbon cycle
B. Nitrogen cycle
C. Water cycle
D. Sulphur cycle
24. Which condition reduces the rate of photosynthesis?
A. High light intensity
B. Adequate carbon dioxide
C. Low temperature
D. Sufficient water
25. The overall equation of photosynthesis shows that
A. Energy is destroyed
B. Glucose is broken down
C. Carbon dioxide and water form glucose and oxygen
D. Oxygen and glucose form carbon dioxide
Photosynthesis and Cellular Respiration Quiz Answers And Explanations
1. B — Manufacture food using sunlight
Photosynthesis enables green plants to produce their own food by using energy from sunlight. During this process, plants combine carbon dioxide and water to form glucose, which serves as their main source of energy and building material for growth and development.
2. B — Chlorophyll
Chlorophyll is the green pigment found in plant leaves that absorbs light energy, especially from the sun. This absorbed energy is used to drive the chemical reactions of photosynthesis and is essential for food production in plants.
3. C — Chloroplast
Chloroplasts are special organelles found in green plant cells where photosynthesis takes place. They contain chlorophyll and enzymes that help convert light energy into chemical energy stored in glucose molecules.
4. B — Carbon dioxide and water
Photosynthesis requires carbon dioxide from the air and water from the soil as raw materials. These substances combine in the presence of sunlight and chlorophyll to form glucose and release oxygen.
5. C — Sunlight
Sunlight provides the energy needed to drive the photosynthetic reactions. Without sunlight, chlorophyll cannot absorb energy, and food production in plants will be greatly reduced or stopped.
6. C — Oxygen
Oxygen is released as a by-product during photosynthesis when water molecules are split in the light reaction. This oxygen is essential for the respiration of plants, animals, and humans.
7. C — Glucose
Glucose is the main food produced during photosynthesis. It provides energy for respiration and can be converted into starch, cellulose, or fats for storage and structural purposes.
8. B — Thylakoid membrane
Chlorophyll is located in the thylakoid membranes of the chloroplast. These membranes contain pigments and enzymes that trap light energy and initiate the light-dependent reactions of photosynthesis.
9. C — Light reaction
The light reaction requires sunlight and takes place in the thylakoid membranes. During this stage, light energy is converted into chemical energy in the form of ATP and NADPH.
10. C — Stroma
The dark reaction, also called the Calvin cycle, occurs in the stroma of the chloroplast. It does not require light directly and uses energy from ATP to form glucose from carbon dioxide.
11. C — Release energy from food
Cellular respiration is the process by which cells break down glucose to release energy. This energy is used for growth, movement, repair, and other life activities.
12. C — Mitochondrion
Mitochondria are known as the powerhouses of the cell because they are the main sites of respiration. They contain enzymes that help in breaking down food molecules to produce energy.
13. B — ATP
ATP is the energy currency of the cell. It stores energy released during respiration and supplies it for various biological activities such as muscle contraction and protein synthesis.
14. C — Glycolysis
Glycolysis is the first stage of respiration and occurs in the cytoplasm. It involves the breakdown of glucose into simpler molecules and releases a small amount of energy.
15. C — Oxygen
Oxygen is required for aerobic respiration because it helps in the complete breakdown of glucose. It acts as the final electron acceptor in the electron transport chain.
16. B — Carbon dioxide and water
Aerobic respiration produces carbon dioxide and water as waste products. These substances are removed from the body through breathing, sweating, and urination.
17. B — Lactic acid and energy
During anaerobic respiration in humans, glucose is partially broken down to form lactic acid and a small amount of energy. This process occurs when oxygen supply is insufficient.
18. C — Green plants
Green plants carry out photosynthesis to make food and also perform respiration to release energy. This makes them unique as both producers and energy users in ecosystems.
19. C — Glucose
The energy from sunlight is stored in glucose molecules produced during photosynthesis. This chemical energy is later released during respiration for biological activities.
20. B — Energy
Respiration involves breaking down glucose to release energy. This energy is used for metabolism, growth, movement, and maintenance of body temperature.
21. B — Stomata
Stomata are tiny pores on the leaf surface that allow exchange of gases. Carbon dioxide enters for photosynthesis, while oxygen and water vapour exit the leaf.
22. C — Electron transport chain
The electron transport chain produces the largest amount of ATP during respiration. It occurs in the inner mitochondrial membrane and uses oxygen to generate energy efficiently.
23. A — Carbon cycle
Photosynthesis and respiration are linked through the carbon cycle. Plants remove carbon dioxide during photosynthesis, while respiration releases it back into the atmosphere.
24. C — Low temperature
Low temperature slows down enzyme activity involved in photosynthesis. As a result, chemical reactions occur slowly, reducing the rate of food production in plants.
25. C — Carbon dioxide and water form glucose and oxygen
The overall equation of photosynthesis shows that plants use carbon dioxide and water in the presence of sunlight to produce glucose and release oxygen, maintaining life balance on Earth.
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