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

During the light reactions of photosynthesis, what is the primary function of chlorophyll?

Accepted Answer

To absorb light energy and transfer electrons

Question 3

Which molecule acts as the final electron acceptor in the light reactions of photosynthesis?

Accepted Answer

NADP$$^+$$

Question 4

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

Accepted Answer

It would decrease because chlorophyll reflects green light

Question 5

Which of the following is produced during the Calvin cycle?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 6

A scientist measures the rate of oxygen production in a plant exposed to different wavelengths of light. Which wavelength would likely result in the highest oxygen production?

Accepted Answer

Red light (around 680 nm)

Question 7

Which of the following best explains why plants are important for maintaining atmospheric oxygen levels?

Accepted Answer

They release oxygen as a byproduct of splitting water during photosynthesis

Question 8

In the process of photosynthesis, what is the source of electrons for the electron transport chain in the light reactions?

Accepted Answer

Water ($$H_2O)$$

Question 9

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

Accepted Answer

ATP

Question 10

A plant is placed in a sealed chamber with only carbon dioxide and water. If light is provided, which of the following will accumulate in the chamber?

Accepted Answer

Oxygen

Question 11

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

It uses ATP and NADPH to convert CO$$_2$$ into G3P

Question 12

If a mutation prevents a plant from producing NADP$$^+$$, what would be the most immediate effect on photosynthesis?

Accepted Answer

The light reactions would stop because electrons could not be transferred

Question 13

Which structure within the chloroplast is the site of the light reactions?

Accepted Answer

Thylakoid membrane

Question 14

A farmer notices that his crops are wilting and suspects a problem with photosynthesis. Which environmental factor is LEAST likely to directly affect the light reactions?

Accepted Answer

Soil nitrogen levels

Question 15

Which of the following best describes the role of ATP synthase in photosynthesis?

Accepted Answer

It produces ATP using the energy from a proton gradient

Question 16

If a plant is deprived of carbon dioxide, which process will be directly affected?

Accepted Answer

The Calvin cycle

Question 17

Which of the following is a multi-step process that integrates both the light reactions and the Calvin cycle?

Accepted Answer

The conversion of light energy to chemical energy and then to glucose

Question 18

A leaf is tested and found to have low levels of ATP and NADPH. Which part of photosynthesis is most likely malfunctioning?

Accepted Answer

The light reactions

Question 19

Which of the following is a real-world application of photosynthesis in addressing climate change?

Accepted Answer

Planting trees to increase CO$$_2$$ uptake and reduce atmospheric carbon

Question 20

Which of the following best explains why photosynthesis is considered an endergonic process?

Accepted Answer

It requires an input of energy from sunlight to drive the reaction

Photosynthesis: Using Light to Make Food (Chapter 7 Study Notes)

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