Q: Which of the following best describes the overall equation for photosynthesis in plants?

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

Question 1

Which of the following best describes the overall equation for photosynthesis in plants?

Accepted Answer

$$6CO_2 + 6H_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6O_2$$

Question 2

What is the primary function of chlorophyll in photosynthesis?

Accepted Answer

To absorb light energy and convert it to chemical energy

Question 3

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

Accepted Answer

Thylakoid membrane

Question 4

During the light reactions of photosynthesis, what is the source of electrons for the electron transport chain?

Accepted Answer

Water ($$H_2O)$$

Question 5

Which of the following is a product of the Calvin cycle?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 6

What is the role of ATP and NADPH in the Calvin cycle?

Accepted Answer

They provide energy and electrons for the reduction of $$CO_2 to $$sugar

Question 7

Which process is responsible for the release of oxygen during photosynthesis?

Accepted Answer

Splitting of water molecules in the light reactions

Question 8

Why do C4 and CAM plants have an advantage in hot, dry climates compared to C3 plants?

Accepted Answer

They minimize photorespiration by fixing $$CO_2$$ into four-carbon compounds

Question 9

Which of the following statements about the greenhouse effect is correct?

Accepted Answer

It is caused by gases like $$CO_2$$ trapping heat in the atmosphere

Question 10

In an experiment, plants are supplied with $$H_2$$^{18}O$$ (water labeled with the heavy isotope $$^{18}O$$). Which product of photosynthesis will contain the $$^{18}O$$ label?

Accepted Answer

Oxygen gas ($$O_2)$$

Question 11

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

Accepted Answer

It does not require light directly and can occur in the absence of light if ATP and NADPH are available

Question 12

What is the main function of the enzyme rubisco in the Calvin cycle?

Accepted Answer

It catalyzes the fixation of $$CO_2 to $$RuBP

Question 13

Which of the following is a correct comparison between photophosphorylation in chloroplasts and oxidative phosphorylation in mitochondria?

Accepted Answer

Both use a proton gradient to drive ATP synthesis via ATP synthase

Question 14

If the thylakoid membrane is punctured so that the interior of the thylakoid is no longer separated from the stroma, which process will be directly affected?

Accepted Answer

Synthesis of ATP

Question 15

Which of the following best describes the fate of the majority of G3P molecules produced in the Calvin cycle?

Accepted Answer

They are used to regenerate RuBP

Question 16

A scientist exposes a plant to only green light. What is the most likely outcome for the rate of photosynthesis?

Accepted Answer

It will decrease because chlorophyll reflects green light

Question 17

Which of the following is a direct consequence of closing stomata on a hot, dry day for a C3 plant?

Accepted Answer

Photorespiration increases due to reduced $$CO_2$$ availability

Question 18

Which of the following is a real-world consequence of deforestation on the global carbon cycle?

Accepted Answer

It reduces the rate at which atmospheric $$CO_2 is $$removed by photosynthesis

Question 19

Which of the following best explains why ATP synthase is essential for the light reactions of photosynthesis?

Accepted Answer

It couples the flow of protons down their gradient to the synthesis of ATP from ADP and $$P_i$$

Question 20

Which of the following is a significant outcome of the Paris climate agreement as it relates to photosynthesis and climate change?

Accepted Answer

It aims to reduce greenhouse gas emissions, which may help maintain the balance of the global carbon cycle

Chapter 7: Photosynthesis – Using Light to Make Food (Campbell Biology, Concepts & Connections, 10th Edition)

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