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

Question 1

Which of the following best describes the primary function of the light reactions in photosynthesis?

Accepted Answer

To use light energy to split water, producing ATP, NADPH, and O2

Question 2

What is the main role of chlorophyll in the thylakoid membrane during photosynthesis?

Accepted Answer

To absorb light energy and transfer it to electrons

Question 3

Which of the following statements about the Z scheme of photosynthesis is correct?

Accepted Answer

It shows the energy changes of electrons as they move through Photosystem II and Photosystem I

Question 4

Why do plants appear green to the human eye?

Accepted Answer

They reflect green wavelengths and absorb red and blue

Question 5

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

Accepted Answer

ATP, NADPH, and O2

Question 6

What is the fate of the excited electron in the reaction center of Photosystem II?

Accepted Answer

It is transferred to a primary electron acceptor, pheophytin

Question 7

Which equation correctly summarizes the overall process of photosynthesis?

Accepted Answer

$$6CO_2 + 12H_2O + 	ext{Light Energy} ightarrow C_6H_{12}O_6$ + 6O_2 + 6H_2O$$

Question 8

During cyclic photophosphorylation, which of the following is produced?

Accepted Answer

ATP only

Question 9

What is the source of electrons that replace those lost by P680 in Photosystem II?

Accepted Answer

Water molecules ($$H_2O)$$

Question 10

Which of the following best explains why multiple pigments are beneficial for plant photosynthesis?

Accepted Answer

They allow plants to absorb light at a wider range of wavelengths

Question 11

Which phase of the Calvin cycle is responsible for incorporating CO2 into an organic molecule?

Accepted Answer

Carbon fixation

Question 12

A plant is exposed to light with a wavelength of 700 nm. Which pigment is most likely to absorb this light efficiently?

Accepted Answer

Chlorophyll a

Question 13

Which of the following best describes the relationship between wavelength and energy of photons?

Accepted Answer

Shorter wavelengths have higher energy

Question 14

If a mutation prevents the splitting of water in Photosystem II, which of the following would be directly affected?

Accepted Answer

O2 production would stop

Question 15

Which of the following is required for the Calvin cycle to synthesize one molecule of glucose?

Accepted Answer

$$18$$ ATP and $$12$$ NADPH

Question 16

Which of the following is NOT a possible fate of an excited electron in a pigment molecule?

Accepted Answer

It is used to directly synthesize glucose

Question 17

In the context of photosynthesis, what is the main function of the electron transport chain in the thylakoid membrane?

Accepted Answer

To create a proton gradient used to synthesize ATP

Question 18

Which of the following best explains why the Calvin cycle is sometimes called the 'dark reactions'?

Accepted Answer

It does not require light directly, but uses ATP and NADPH from the light reactions

Question 19

A plant is genetically modified so that it lacks Photosystem I. Which of the following processes would be most directly affected?

Accepted Answer

Production of NADPH

Question 20

Which of the following best describes the role of resonance energy transfer in the light-harvesting complex?

Accepted Answer

It transfers energy from one pigment molecule to another without transferring electrons

Photosynthesis: Light Reactions and the Calvin Cycle

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