Question 1

Which of the following best describes the overall process of photosynthesis in plants?

Accepted Answer

Conversion of solar energy into chemical energy stored in glucose

Question 2

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

Accepted Answer

NADP$$^+$$

Question 3

Which equation correctly represents the overall chemical reaction for photosynthesis?

Accepted Answer

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

Question 4

In the Calvin cycle, what is the primary function of the enzyme Rubisco?

Accepted Answer

To fix carbon dioxide by catalyzing its attachment to ribulose bisphosphate (RuBP)

Question 5

Which of the following best explains why C$$_4$$ and CAM plants have evolved alternative mechanisms of carbon fixation?

Accepted Answer

To minimize photorespiration and water loss in hot, arid environments

Question 6

Which color of visible light has the shortest wavelength and the highest energy?

Accepted Answer

Violet

Question 7

What is the main product of the Calvin cycle that can be used to synthesize glucose?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

Question 8

Which of the following statements about the light reactions of photosynthesis is correct?

Accepted Answer

They occur in the thylakoid membranes and generate ATP and NADPH

Question 9

A plant exposed to intense sunlight in a hot, dry climate closes its stomata during the day. What is the most likely consequence for photosynthesis?

Accepted Answer

Decreased rate of photosynthesis due to limited CO$$_2$$ uptake

Question 10

Which of the following best describes the role of the photosystem II reaction center in linear electron flow?

Accepted Answer

It absorbs light energy and donates electrons to the electron transport chain

Question 11

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

Accepted Answer

Photolysis of water in the light reactions

Question 12

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

Accepted Answer

Absorption of light by photosystem II, electron transport, formation of NADPH

Question 13

Which formula represents the net production of one G3P molecule in the Calvin cycle?

Accepted Answer

$$3CO_2 + 9ATP + 6NADPH \rightarrow 1G3P + 9ADP + 8P_i + 6NADP^+$$

Question 14

Which of the following is a key difference between C$$_3$$ and C$$_4$$ plants?

Accepted Answer

C$$_4$$ plants use spatial separation of carbon fixation and the Calvin cycle, while C$$_3$$ plants do not

Question 15

Which of the following best explains the relationship between wavelength and energy in the visible spectrum?

Accepted Answer

Shorter wavelengths have higher energy

Question 16

In cyclic electron flow, which molecule is produced but not NADPH?

Accepted Answer

ATP

Question 17

Which of the following is a correct description of a photosystem?

Accepted Answer

A protein complex composed of a reaction-center complex surrounded by several light-harvesting complexes

Question 18

What is the primary function of the light-harvesting complexes in a photosystem?

Accepted Answer

To capture and transfer light energy to the reaction center

Question 19

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

Accepted Answer

Decreased efficiency of photosynthesis due to consumption of ATP and release of CO$$_2$$

Chapter 10: Photosynthesis – Study Notes

Study Guide - Practice Questions