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

During the light reactions of photosynthesis, which molecule is split to provide electrons, protons, and oxygen?

Accepted Answer

$$H_2O$$

Question 3

Which pigment is primarily responsible for capturing light energy in the chloroplasts?

Accepted Answer

Chlorophyll a

Question 4

What is the main function of the Calvin cycle in photosynthesis?

Accepted Answer

To fix carbon dioxide and produce sugar

Question 5

Which of the following statements about the absorption spectrum of chlorophyll is correct?

Accepted Answer

Chlorophyll absorbs violet-blue and red light most efficiently

Question 6

In the process of chemiosmosis in chloroplasts, where are protons pumped to create a gradient?

Accepted Answer

From the stroma into the thylakoid space

Question 7

Which of the following best explains why leaves appear green?

Accepted Answer

Chlorophyll reflects and transmits green light

Question 8

What is the role of NADP+ in the light reactions of photosynthesis?

Accepted Answer

It is reduced to NADPH, storing high-energy electrons

Question 9

Which of the following is a correct comparison between chemiosmosis in mitochondria and chloroplasts?

Accepted Answer

Both use a proton gradient to drive ATP synthesis

Question 10

A plant is exposed only to green light. What will most likely happen to its rate of photosynthesis?

Accepted Answer

It will decrease because green light is mostly reflected

Question 11

Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?

Accepted Answer

Rubisco

Question 12

What is the main purpose of cyclic electron flow in the light reactions?

Accepted Answer

To produce ATP without producing NADPH or O2

Question 13

Which of the following best describes the fate of oxygen produced during photosynthesis?

Accepted Answer

It is released as a by-product into the atmosphere

Question 14

If a plant's thylakoid membranes were punctured so that the interior of the thylakoid was no longer separated from the stroma, which process would be most directly affected?

Accepted Answer

The synthesis of ATP

Question 15

Which of the following is true regarding the energy of photons and their wavelength?

Accepted Answer

Shorter wavelengths have higher energy per photon

Question 16

During the Calvin cycle, for the net synthesis of one G3P molecule, how many ATP and NADPH molecules are consumed?

Accepted Answer

9 ATP and 6 NADPH

Question 17

Which of the following best explains why carotenoids are important to plants?

Accepted Answer

They broaden the spectrum of light that can drive photosynthesis and protect chlorophyll from damage

Question 18

Which of the following is a direct product of the light reactions and is used in the Calvin cycle?

Accepted Answer

NADPH

Question 19

A mutation in a plant prevents the formation of photosystem II. Which of the following would be a direct consequence?

Accepted Answer

The plant would be unable to split water and release oxygen

Question 20

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in organic molecules, while cellular respiration releases it

Photosynthesis: Mechanisms, Pigments, and Energy Conversion

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