Question 1

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

Accepted Answer

Chlorophyll absorbs visible light, exciting electrons that initiate the light-dependent reactions.

Question 2

What is the correct balanced chemical equation for photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 3

During the light-dependent reactions of photosynthesis, what is the primary function of NADP$$^+$$?

Accepted Answer

NADP$$^+$$ acts as an electron acceptor, becoming NADPH.

Question 4

Which structure within the chloroplast is the site of the light-dependent reactions?

Accepted Answer

Thylakoid membrane

Question 5

What is the main product of the Calvin cycle?

Accepted Answer

Glucose

Question 6

Which of the following statements about electromagnetic radiation is correct?

Accepted Answer

Electromagnetic radiation is a form of energy that includes all forms of the electromagnetic spectrum.

Question 7

What happens to water ($$H_2O) $$molecules during the light-dependent reactions?

Accepted Answer

They are broken down, releasing oxygen gas.

Question 8

Which molecule acts as the final electron acceptor in the light-dependent reactions?

Accepted Answer

NADP$$^+$$

Question 9

How is ATP produced during the light-dependent reactions?

Accepted Answer

By chemiosmosis, as protons flow through ATP synthase in the thylakoid membrane.

Question 10

Which of the following best describes the role of the Calvin cycle in photosynthesis?

Accepted Answer

It converts carbon dioxide and the energy from ATP and NADPH into glucose.

Question 11

A plant is exposed only to green light. What is the most likely effect on its rate of photosynthesis?

Accepted Answer

Photosynthesis will decrease because chlorophyll reflects green light.

Question 12

Which process directly produces oxygen during photosynthesis?

Accepted Answer

The splitting of water molecules in the light-dependent reactions

Question 13

If a plant's thylakoid membranes are damaged, which process will be most directly affected?

Accepted Answer

ATP and NADPH production during the light-dependent reactions

Question 14

Which of the following is NOT a product of the light-dependent reactions?

Accepted Answer

Glucose

Question 15

What is the primary source of electrons for the light-dependent reactions?

Accepted Answer

Water

Question 16

Which statement best explains why plants appear green?

Accepted Answer

Chlorophyll reflects green light, which is why plants appear green.

Question 17

During photosynthesis, what is the fate of the oxygen atoms in water molecules?

Accepted Answer

They are released as oxygen gas.

Question 18

Which of the following is required for the Calvin cycle to proceed?

Accepted Answer

ATP and NADPH produced in the light-dependent reactions

Question 19

A mutation prevents a plant from producing NADPH. Which process will be most directly affected?

Accepted Answer

The Calvin cycle, which requires NADPH to reduce carbon dioxide.

Question 20

Which of the following best describes the relationship between the light-dependent reactions and the Calvin cycle?

Accepted Answer

The light-dependent reactions produce ATP and NADPH, which are used by the Calvin cycle to synthesize glucose.

Chloroplasts, Chlorophyll, and Photosynthesis: Light and Dark Reactions

Study Guide - Practice Questions