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

Which organelle is primarily responsible for photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 3

What is the main function of the stomata in plant leaves?

Accepted Answer

Allow gas exchange of $$CO_2$$ and $$O_2$$

Question 4

Which pigment is the primary light-capturing molecule in the light reactions of photosynthesis?

Accepted Answer

Chlorophyll a

Question 5

During the light reactions, what is the immediate source of electrons for Photosystem II?

Accepted Answer

Water ($$H_2O)$$

Question 6

Which of the following best explains why green light is least effective for photosynthesis?

Accepted Answer

Green light is reflected or transmitted by chlorophyll

Question 7

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

Accepted Answer

It is the final electron acceptor, forming NADPH

Question 8

Which process in photosynthesis directly generates ATP using a proton gradient?

Accepted Answer

Photophosphorylation

Question 9

How does chemiosmosis in chloroplasts differ from that in mitochondria?

Accepted Answer

In chloroplasts, protons are pumped into the thylakoid space; in mitochondria, into the intermembrane space

Question 10

Which of the following is a product of cyclic electron flow in the light reactions?

Accepted Answer

ATP only

Question 11

What is the first step of the Calvin cycle?

Accepted Answer

Carbon fixation by rubisco

Question 12

Which enzyme catalyzes the initial fixation of $$CO_2 in C$_4$$ plants?

Accepted Answer

PEP carboxylase

Question 13

Why do CAM plants open their stomata at night?

Accepted Answer

To minimize water loss in arid environments

Question 14

Which of the following is a consequence of photorespiration in C$$_3$$ plants?

Accepted Answer

Consumption of organic fuel without producing ATP or sugar

Question 15

In the Calvin cycle, how many molecules of $$CO_2$$ must be fixed to produce one net molecule of G3P?

Accepted Answer

$$3$$

Question 16

Which of the following best describes the difference between C$$_3$$ and C$$_4$$ plants?

Accepted Answer

C$$_3$$ plants fix $$CO_2$$ into a three-carbon compound; C$$_4$$ plants fix $$CO_2$$ into a four-carbon compound

Question 17

Which of the following is NOT a function of the light-harvesting complex in a photosystem?

Accepted Answer

Directly producing ATP

Question 18

A scientist uses a spectrophotometer to measure the absorption spectrum of a pigment. What does the absorption spectrum show?

Accepted Answer

The wavelengths of light absorbed by the pigment

Question 19

Which of the following statements about the spatial organization of chemiosmosis is correct?

Accepted Answer

In chloroplasts, protons diffuse from the thylakoid space to the stroma to drive ATP synthesis

Question 20

Which of the following is a real-world consequence of photosynthesis for life on Earth?

Accepted Answer

It provides chemical energy and carbon skeletons for organic molecules

Ch. 10 Photosynthesis: Mechanisms, Structures, and Adaptations

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