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Photosynthesis: 17 MCQs with answers

All 17 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything Flashcards · 17 Quick Revision · 12

Warm-up · 9 questions

Q1. What is the primary purpose of photosynthesis in plants?

Beginner
A To release energy from food B To produce food (glucose) using sunlight C To absorb water from the soil D To transport nutrients throughout the plant
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To produce food (glucose) using sunlight

Photosynthesis is the process by which plants make their own food (glucose) using sunlight, carbon dioxide, and water.

Q2. Which of the following is NOT a raw material required for photosynthesis?

Beginner
A Sunlight B Oxygen C Water D Carbon dioxide
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Oxygen

Oxygen is a product of photosynthesis, not a raw material. The raw materials are carbon dioxide, water, and sunlight.

Q3. In which organelle does photosynthesis take place?

Beginner
A Ribosome B Mitochondria C Nucleus D Chloroplast
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Chloroplast

Photosynthesis occurs in the chloroplasts, which contain the green pigment chlorophyll.

Q4. Which gas is released as a byproduct of photosynthesis?

Beginner
A Hydrogen B Nitrogen C Oxygen D Carbon dioxide
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Oxygen

Oxygen is produced when water molecules are split during the light-dependent reactions of photosynthesis.

Q5. What is the main source of energy for photosynthesis?

Beginner
A Sunlight B Glucose C ATP D Water
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Sunlight

Sunlight is the primary energy source that drives the process of photosynthesis.

Q6. Which pigment is primarily responsible for capturing light energy in plants?

Beginner
A Xanthophyll B Carotene C Chlorophyll D Anthocyanin
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Chlorophyll

Chlorophyll is the main pigment that absorbs light energy for photosynthesis.

Q7. What happens to the oxygen produced during photosynthesis?

Beginner
A It is released into the atmosphere B It is converted to carbon dioxide C It is used by the plant for respiration D It is stored in the chloroplast
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It is released into the atmosphere

Oxygen is released into the atmosphere as a byproduct of photosynthesis.

Q8. Photosynthesis occurs only in the presence of sunlight.

Beginner
A True B False
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True

Sunlight is essential for the light-dependent reactions of photosynthesis, so the process requires light.

Q9. Plants perform photosynthesis only during the day.

Beginner
A True B False
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True

Photosynthesis requires sunlight, so it occurs during the day when light is available.

Building up · 8 questions

Q10. What is the role of chlorophyll in photosynthesis?

Intermediate
A It breaks down water B It absorbs light energy C It stores glucose D It releases oxygen
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It absorbs light energy

Chlorophyll is the pigment that absorbs light energy, which is then used to drive the reactions of photosynthesis.

Q11. What is the chemical equation for photosynthesis?

Intermediate
A $6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$ B $6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6H_2$ C $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$ D $6CO_2 + 6O_2 \rightarrow C_6H_{12}O_6 + 6H_2O$
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$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$

The balanced equation for photosynthesis is $6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$, showing carbon dioxide and water converting to glucose and oxygen.

Q12. What are the two main stages of photosynthesis?

Intermediate
A Absorption and translocation B Glycolysis and Krebs cycle C Respiration and transpiration D Light-dependent reactions and Calvin cycle
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Light-dependent reactions and Calvin cycle

Photosynthesis consists of the light-dependent reactions (which capture energy from sunlight) and the Calvin cycle (which uses that energy to make glucose).

Q13. Where do the light-dependent reactions of photosynthesis occur?

Intermediate
A Thylakoid membrane B Cell wall C Cytoplasm D Stroma
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Thylakoid membrane

The light-dependent reactions take place in the thylakoid membranes of the chloroplasts, where chlorophyll and other pigments are located.

Q14. What is the primary product of the Calvin cycle?

Intermediate
A Glucose B Oxygen C ATP D NADPH
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Glucose

The Calvin cycle uses ATP and NADPH from the light-dependent reactions to convert carbon dioxide into glucose.

Q15. Which of the following factors can limit the rate of photosynthesis?

Intermediate
A Temperature B Light intensity C Carbon dioxide concentration D All of the above
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All of the above

Light intensity, carbon dioxide concentration, and temperature are all limiting factors that can affect the rate of photosynthesis.

Q16. What is the role of water in photosynthesis?

Intermediate
A It absorbs light energy B It releases carbon dioxide C It stores glucose D It provides electrons and protons
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It provides electrons and protons

Water is split during the light-dependent reactions to provide electrons, protons, and oxygen.

Q17. In which part of the chloroplast does the Calvin cycle take place?

Intermediate
A Outer membrane B Thylakoid lumen C Stroma D Intermembrane space
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Stroma

The Calvin cycle occurs in the stroma, the fluid-filled space surrounding the thylakoids.

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