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

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

Question 1

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

Accepted Answer

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

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

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

Accepted Answer

Water ($$\mathrm{H}_2O)$$

Question 4

Which of the following best explains why chloroplasts absorb photons?

Accepted Answer

To capture energy needed to drive the synthesis of ATP and NADPH

Question 5

What are the inputs and outputs of the Calvin cycle?

Accepted Answer

Inputs: ATP, NADPH, $$\mathrm{CO}_2$$; Outputs: Sugar ($$\mathrm{CH}_2O)$$

Question 6

Which statement correctly compares oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts?

Accepted Answer

Photophosphorylation uses light energy in the thylakoid membrane, while oxidative phosphorylation uses chemical energy in the mitochondria

Question 7

What is the role of NADPH in the Calvin cycle?

Accepted Answer

It donates electrons to reduce PGA, forming G3P

Question 8

A plant is exposed to intense sunlight and closes its stomata to conserve water. Which photosynthetic adaptation is most likely being used?

Accepted Answer

C4 pathway, which fixes $$\mathrm{CO}_2$$ using a different enzyme

Question 9

Which of the following is a major consequence of photorespiration in plants?

Accepted Answer

Reduced rate of $$\mathrm{CO}_2$$ fixation and decreased photosynthetic efficiency

Question 10

Which adaptation allows CAM plants to survive in dry environments?

Accepted Answer

They open their stomata at night to incorporate $$\mathrm{CO}_2$$ into organic acids

Question 11

Which of the following best describes the flow of energy through photosynthesis and cellular respiration in an ecosystem?

Accepted Answer

Energy enters as sunlight, is converted to chemical energy, and eventually leaves as heat and ATP

Question 12

A scientist measures the oxygen output of a plant under different light conditions. Which process is directly responsible for the release of oxygen?

Accepted Answer

Splitting of water molecules during the light reactions

Question 13

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

Accepted Answer

NADP+

Question 14

If a plant's thylakoid membranes are damaged, which process would be most directly affected?

Accepted Answer

Production of ATP and NADPH during the light reactions

Question 15

Which of the following best explains why photorespiration is considered wasteful for plants?

Accepted Answer

It reduces the rate of carbon fixation and consumes energy without producing sugars

Question 16

A researcher is studying a plant that opens its stomata only at night and stores $$\mathrm{CO}_2 as $$organic acids. What type of plant is this?

Accepted Answer

CAM plant

Question 17

Which of the following is NOT an input for the light reactions of photosynthesis?

Accepted Answer

Glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6)$$

Question 18

In which part of the chloroplast do the light reactions occur?

Accepted Answer

Thylakoid discs

Question 19

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

Accepted Answer

It provides energy to add a phosphate group to PGA

Question 20

A field of corn (a C4 plant) is compared to a field of wheat (a C3 plant) during a hot, dry summer. Which statement best explains why corn maintains higher photosynthetic rates?

Accepted Answer

Corn uses a C4 pathway that minimizes photorespiration by fixing $$\mathrm{CO}_2$$ with a different enzyme

Photosynthesis: Mechanisms, Adaptations, and Energy Flow

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