Question 1

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

Accepted Answer

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

Question 2

Photoautotrophs differ from heterotrophs in that photoautotrophs:

Accepted Answer

Use light energy to make organic compounds from inorganic substances

Question 3

Which organelle is primarily responsible for photosynthesis in eukaryotic cells?

Accepted Answer

Chloroplast

Question 4

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

Accepted Answer

NADP$$^+$$

Question 5

What is the main function of accessory pigments such as carotenoids in photosynthesis?

Accepted Answer

Capture light energy and protect chlorophyll from damage

Question 6

Which part of the chloroplast is the site of the Calvin cycle?

Accepted Answer

Stroma

Question 7

If a plant is exposed only to green light, what would most likely happen to its rate of photosynthesis?

Accepted Answer

It would decrease because chlorophyll reflects green light

Question 8

Which enzyme catalyzes the first step of carbon fixation in the Calvin cycle?

Accepted Answer

Rubisco

Question 9

What is the primary output of the Calvin cycle that can be used to synthesize glucose and other organic molecules?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

Question 10

Which of the following best explains why oxygen is released during photosynthesis?

Accepted Answer

Water is split during the light reactions, releasing O$$_2 as a $$byproduct

Question 11

Which photosystem is primarily responsible for producing NADPH?

Accepted Answer

Photosystem I

Question 12

What is the role of ATP and NADPH in the Calvin cycle?

Accepted Answer

They provide energy and electrons for carbon fixation and reduction

Question 13

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

Accepted Answer

Photon absorption by chlorophyll, water splitting, electron transport, ATP and NADPH formation

Question 14

A mutation disables ATP synthase in a plant cell. Which process would be directly affected?

Accepted Answer

Chemiosmotic production of ATP during the light reactions

Question 15

Which statement best describes the fate of the glucose produced by photosynthesis in plants?

Accepted Answer

About half is used for cellular respiration, while the rest is stored or used for structure and other biomolecules

Question 16

Which of the following is NOT a phase of the Calvin cycle?

Accepted Answer

Photolysis

Question 17

If the concentration gradient of protons (H$$^+) $$across the thylakoid membrane is disrupted, what immediate effect would this have?

Accepted Answer

ATP synthesis would decrease due to lack of chemiosmosis

Question 18

Which pigment is most directly involved in the reaction center of photosystems?

Accepted Answer

Chlorophyll a

Question 19

A scientist exposes algae to different wavelengths of light and measures oxygen production. Which wavelength would likely result in the lowest oxygen output?

Accepted Answer

Green (around 550 nm)

Question 20

Which of the following best explains the importance of resonance energy transfer in photosystems?

Accepted Answer

It allows energy absorbed by accessory pigments to be transferred to chlorophyll a in the reaction center

Photosynthesis: Mechanisms, Organisms, and Biochemical Pathways

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