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

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2$$

Question 1

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

Accepted Answer

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2$$

Question 2

What is the primary function of the light reactions in photosynthesis?

Accepted Answer

To convert solar energy into chemical energy in the form of ATP and NADPH

Question 3

Which structure within the chloroplast is the main site of the light-dependent reactions?

Accepted Answer

Thylakoid membrane

Question 4

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

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 5

What is the role of chlorophyll in photosynthesis?

Accepted Answer

It absorbs light energy to excite electrons

Question 6

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

Accepted Answer

It uses ATP and NADPH to convert $$\mathrm{CO}_2$$ into G3P

Question 7

In the process of photosynthesis, which molecule is reduced and which is oxidized?

Accepted Answer

$$\mathrm{CO}_2 is $$reduced and $$\mathrm{H}_2\mathrm{O} is $$oxidized

Question 8

Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?

Accepted Answer

Rubisco

Question 9

Why are C4 plants more efficient than C3 plants in hot, arid environments?

Accepted Answer

They spatially separate carbon fixation and the Calvin cycle, reducing photorespiration

Question 10

What is the immediate product of the Calvin cycle that can be used to synthesize glucose and other organic molecules?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

Question 11

Which of the following best explains why plants appear green?

Accepted Answer

Chlorophyll reflects green light and absorbs other wavelengths

Question 12

What is the main purpose of the proton gradient established across the thylakoid membrane during the light reactions?

Accepted Answer

To drive ATP synthesis via chemiosmosis

Question 13

Which of the following is a correct comparison between the Calvin cycle and the citric acid cycle?

Accepted Answer

The Calvin cycle is anabolic, while the citric acid cycle is catabolic

Question 14

A plant is exposed to light, but its thylakoid membranes are damaged so that protons can freely cross the membrane. What is the most likely consequence?

Accepted Answer

ATP synthesis will decrease because the proton gradient cannot be maintained

Question 15

Which of the following best describes the fate of oxygen produced during photosynthesis?

Accepted Answer

It is released as a by-product from the splitting of water

Question 16

If a plant is placed in an environment with no light, which of the following processes will immediately stop?

Accepted Answer

The production of ATP and NADPH in the thylakoids

Question 17

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

Accepted Answer

ATP and NADPH

Question 18

Why is NADPH important for the Calvin cycle?

Accepted Answer

It provides the reducing power to convert 3-phosphoglycerate to G3P

Question 19

Which of the following adaptations allows C4 plants to minimize photorespiration?

Accepted Answer

Spatial separation of carbon fixation and the Calvin cycle

Question 20

Which of the following best explains the importance of photosynthesis for life on Earth?

Accepted Answer

It produces oxygen and organic molecules that support most ecosystems

Chapter 8

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드