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

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

Question 1

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

Accepted Answer

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

Question 2

Which of the following statements about photoautotrophs is correct?

Accepted Answer

They produce organic compounds from $$\mathrm{CO}_2$$ using light energy.

Question 3

A scientist is studying a pigment that absorbs light most strongly at 680 nm. In which photosystem is this pigment most likely found?

Accepted Answer

Photosystem II

Question 4

Which of the following best explains why plants appear green to the human eye?

Accepted Answer

Chlorophyll reflects green light and absorbs other wavelengths.

Question 5

During the light reactions of photosynthesis, what is the primary role of water?

Accepted Answer

To provide electrons to replace those lost by chlorophyll in Photosystem II.

Question 6

Which of the following is a correct description of the role of NADPH in photosynthesis?

Accepted Answer

It acts as an intermediate reducing agent, carrying electrons to the Calvin cycle.

Question 7

A plant is exposed only to green light. What is the most likely effect on the rate of photosynthesis, and why?

Accepted Answer

The rate will decrease because chlorophyll absorbs little green light.

Question 8

Which of the following processes occurs in the stroma of the chloroplast?

Accepted Answer

The Calvin cycle (dark reactions)

Question 9

What is the main purpose of the electron transport chain in the thylakoid membrane during the light reactions?

Accepted Answer

To create a proton gradient that drives ATP synthesis via chemiosmosis

Question 10

Which of the following best describes the fate of the oxygen atoms from water molecules during photosynthesis?

Accepted Answer

They are released as $$\mathrm{O}_2$$ gas during the light reactions.

Question 11

A mutation disables ATP synthase in a plant cell's chloroplasts. Which process would be directly affected?

Accepted Answer

The production of ATP during the light reactions

Question 12

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose

Question 13

In the Calvin cycle, for the net synthesis of one molecule of glyceraldehyde-3-phosphate (G3P), how many molecules of $$\mathrm{CO}_2$$ must enter the cycle?

Accepted Answer

3

Question 14

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 15

A plant is genetically modified so that it cannot produce carotenoids. What is a likely consequence for the plant?

Accepted Answer

It will be more susceptible to damage from excess light energy.

Question 16

Which of the following statements about redox reactions in photosynthesis is correct?

Accepted Answer

Water is oxidized and carbon dioxide is reduced.

Question 17

If a plant's thylakoid membranes were punctured so that the interior of the thylakoid was no longer separated from the stroma, which process would be most directly affected?

Accepted Answer

The synthesis of ATP via chemiosmosis

Question 18

Which of the following is a real-world consequence of photosynthesis for life on Earth?

Accepted Answer

It produces the oxygen in the atmosphere that most organisms require for respiration.

Question 19

Which of the following best describes the relationship between the light reactions and the Calvin cycle?

Accepted Answer

The light reactions provide ATP and NADPH to the Calvin cycle.

Question 20

A plant cell is placed in an environment with no light but with an abundance of $$\mathrm{CO}_2$$, ATP, and NADPH. Which process can still occur?

Accepted Answer

The Calvin cycle

Introduction to Photosynthesis: General Concepts and Mechanisms

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