Photosynthesis Exam Questions

Which of the following is a product of the light-dependent reactions of photosynthesis?

• Oxygen

• Glucose

• Carbon Dioxide

• Water

What is the primary function of chlorophyll in photosynthesis?

• To absorb water

• To absorb light energy

• To release oxygen

• To produce glucose

Explain why the Calvin cycle is considered a light-independent reaction.

• It occurs only in the dark.

• It does not require light directly to proceed.

• It produces light energy.

• It requires light to start but not to continue.

Which of the following best describes the role of water in photosynthesis?

• It is a product of the Calvin cycle.

• It is split to provide electrons and protons.

• It is used to transport glucose.

• It is converted into carbon dioxide.

How does the structure of a chloroplast enable it to carry out photosynthesis effectively?

• It has a single membrane that allows for easy gas exchange.

• It contains thylakoids stacked into grana to increase surface area for light absorption.

• It is filled with cytoplasm to support chemical reactions.

• It has a rigid structure to protect the chlorophyll.

Which of the following statements about the Calvin cycle is true?

• It directly uses sunlight to produce ATP.

• It converts carbon dioxide into glucose.

• It occurs in the thylakoid membranes.

• It produces oxygen as a byproduct.

Why is photosynthesis considered an endothermic reaction?

• It releases energy in the form of heat.

• It absorbs energy from sunlight.

• It produces energy-rich compounds.

• It occurs only in warm environments.

Identify the main purpose of the light-dependent reactions in photosynthesis.

• To produce glucose directly.

• To convert solar energy into chemical energy in the form of ATP and NADPH.

• To fix carbon dioxide into organic molecules.

• To release carbon dioxide.

Discuss how the rate of photosynthesis might be affected by a decrease in temperature.

• It would increase due to more efficient enzyme activity.

• It would decrease because enzymes become less active.

• It would remain unchanged as temperature does not affect photosynthesis.

• It would stop completely.

Which of the following best explains why plants appear green?

• They absorb green light and reflect all other colors.

• They reflect green light and absorb all other colors.

• They do not absorb any light.

• They only absorb green light.