Q: Which of the following equations correctly represents the overall process of photosynthesis?

$$6CO\_2 + 6H\_2O + \text{light energy} \rightarrow C\_6H\_{12}O\_6 + 6O\_2$$

Question 1

Which of the following best describes the overall purpose of the light reactions in photosynthesis?

Accepted Answer

To convert solar energy into chemical energy stored in ATP and NADPH

Question 2

During the light reactions, which molecule acts as the final electron acceptor at the end of the electron transport chain?

Accepted Answer

NADP\^+

Question 3

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

$$6CO\_2 + 6H\_2O + 	ext{light energy} ightarrow C\_6H\_{12}O\_6 + 6O\_2$$

Question 4

A plant is exposed only to green light. Which of the following best predicts the effect on the rate of photosynthesis?

Accepted Answer

The rate of photosynthesis will decrease because chlorophyll reflects green light.

Question 5

Which of the following best explains why the absorption spectrum of chlorophyll a alone underestimates the effectiveness of certain wavelengths in driving photosynthesis?

Accepted Answer

Accessory pigments absorb additional wavelengths and transfer energy to chlorophyll a.

Question 6

In the Calvin cycle, which enzyme is responsible for carbon fixation, and what is the substrate for this reaction?

Accepted Answer

Rubisco; the substrate is CO\_2

Question 7

Which of the following statements about chemiosmosis in photosynthesis is correct?

Accepted Answer

A proton gradient across the thylakoid membrane drives ATP synthesis via ATP synthase.

Question 8

Which of the following best describes the relationship between wavelength and energy in the visible spectrum?

Accepted Answer

Shorter wavelengths have higher energy than longer wavelengths.

Question 9

During linear electron flow in the light reactions, what is the source of electrons that replace those lost by photosystem II?

Accepted Answer

Water (H\_2O)

Question 10

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

Accepted Answer

Glucose

Question 11

A mutation disables the enzyme that reduces 1,3-bisphosphoglycerate to glyceraldehyde-3-phosphate (G3P) in the Calvin cycle. Which immediate effect would you expect?

Accepted Answer

The Calvin cycle would halt, and G3P would not be produced.

Question 12

How many turns of the Calvin cycle are required to produce one molecule of G3P?

Accepted Answer

Three

Question 13

Which of the following best explains why plants need both photosystems I and II for efficient photosynthesis?

Accepted Answer

Photosystem II generates ATP and splits water, while photosystem I produces NADPH.

Question 14

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

Synthesis of ATP

Question 15

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

Accepted Answer

They are released as O\_2 gas.

Question 16

A scientist measures the net production of G3P from the Calvin cycle. For every 3 CO\_2 molecules fixed, how many molecules of ATP and NADPH are consumed?

Accepted Answer

9 ATP and 6 NADPH

Question 17

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

Accepted Answer

It uses ATP and NADPH to convert CO\_2 to sugar.

Question 18

Which of the following is a real-world example of the importance of photosynthesis to the biosphere?

Accepted Answer

Photosynthesis provides the oxygen we breathe and forms the base of most food chains.

Question 19

Which of the following best describes the role of RuBP in the Calvin cycle?

Accepted Answer

It acts as the CO\_2 acceptor molecule that is regenerated each cycle.

Question 20

Which of the following is a correct sequence of events in the light reactions of photosynthesis?

Accepted Answer

Light absorption by photosystem II \rightarrow electron transport chain \rightarrow ATP synthesis \rightarrow NADP\^+ reduction

Photosynthesis: Key Concepts and Processes

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