Question 1

Which of the following best describes the overall chemical equation for photosynthesis?

Accepted Answer

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

Question 2

Which structure within the chloroplast is the primary site of the light reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 3

During the light reactions, which molecule acts as the final electron acceptor?

Accepted Answer

NADP$$^+$$

Question 4

Which pigment is primarily responsible for absorbing light energy during photosynthesis?

Accepted Answer

Chlorophyll a

Question 5

What is the main purpose of the Calvin Cycle in photosynthesis?

Accepted Answer

To fix carbon dioxide into organic molecules

Question 6

Which of the following best explains why photosynthesis is essential for most life on Earth?

Accepted Answer

It produces oxygen and organic molecules that serve as energy sources for other organisms.

Question 7

In the light reactions, what is the role of water ($$H_2O$$)?

Accepted Answer

It acts as a source of electrons and protons, and releases oxygen as a byproduct.

Question 8

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose

Question 9

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

Accepted Answer

Photosynthesis rate will decrease because chlorophyll reflects green light.

Question 10

Which of the following best describes the role of ATP and NADPH in the Calvin Cycle?

Accepted Answer

They provide energy and reducing power to convert CO$$_2$$ into G3P.

Question 11

Which cell type in a leaf is most directly involved in photosynthesis?

Accepted Answer

Palisade mesophyll

Question 12

What is the function of stomata in plant leaves?

Accepted Answer

To regulate gas exchange and water loss

Question 13

Which of the following best explains why roots of a plant do not perform photosynthesis?

Accepted Answer

Roots lack chloroplasts and are not exposed to light.

Question 14

Which molecule is the first stable product formed in the Calvin Cycle after CO$$_2$$ fixation?

Accepted Answer

3-phosphoglycerate (3-PGA)

Question 15

Which process in photosynthesis is directly responsible for the release of oxygen?

Accepted Answer

Splitting of water during the light reactions

Question 16

A mutation disables the enzyme Rubisco in a plant. What is the most immediate effect?

Accepted Answer

The plant cannot fix CO$$_2 in $$the Calvin Cycle.

Question 17

Which of the following best describes the relationship between the light reactions and the Calvin Cycle?

Accepted Answer

The light reactions provide ATP and NADPH for the Calvin Cycle.

Question 18

Which of the following is a correct sequence of events in the light reactions?

Accepted Answer

Absorption of light by chlorophyll $$\rightarrow$$ splitting of water $$\rightarrow$$ production of ATP and NADPH

Question 19

Which of the following is a real-world consequence of decreased photosynthetic activity in global ecosystems?

Accepted Answer

Increased atmospheric CO$$_2$$ and decreased oxygen production

Question 20

A scientist measures the rate of photosynthesis in two plants: one with normal chlorophyll and one with a mutation that reduces chlorophyll content by 50%. What is the most likely outcome?

Accepted Answer

The mutant plant will have a lower rate of photosynthesis due to reduced light absorption.

Photosynthesis: Using Light to Make Food – Study Guide and Key Concepts

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