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

Accepted Answer

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

Question 2

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

Accepted Answer

Thylakoid membrane

Question 3

A scientist uses a spectrophotometer to analyze a pigment. What does the spectrophotometer measure?

Accepted Answer

The ability of a pigment to absorb various wavelengths of light

Question 4

Which pigment is the primary light-capturing molecule in the light reactions of photosynthesis?

Accepted Answer

Chlorophyll a

Question 5

What is the main function of the Calvin cycle in photosynthesis?

Accepted Answer

To use ATP and NADPH to convert CO$$_2$$ into sugar

Question 6

During linear electron flow in the light reactions, what is the final electron acceptor?

Accepted Answer

NADP$$^+$$

Question 7

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

Accepted Answer

Chlorophyll reflects and transmits green light while absorbing other wavelengths

Question 8

Which of the following is a key difference between chemiosmosis in chloroplasts and mitochondria?

Accepted Answer

In chloroplasts, protons are pumped into the thylakoid space; in mitochondria, protons are pumped into the intermembrane space

Question 9

Which enzyme catalyzes the fixation of CO$$_2 in $$the Calvin cycle?

Accepted Answer

Rubisco (Ribulose bisphosphate carboxylase/oxygenase)

Question 10

A plant in a hot, arid environment opens its stomata at night and closes them during the day. Which type of photosynthetic adaptation does this plant most likely use?

Accepted Answer

CAM pathway

Question 11

Which of the following is a product of cyclic electron flow in the light reactions of photosynthesis?

Accepted Answer

ATP

Question 12

Why is photorespiration considered a wasteful process in C$$_3$$ plants?

Accepted Answer

It consumes organic fuel and O$$_2$$ without producing ATP or sugar

Question 13

Which of the following best describes the role of PEP carboxylase in C$$_4$$ plants?

Accepted Answer

It fixes CO$$_2$$ into a four-carbon compound in mesophyll cells

Question 14

A researcher exposes a plant to only green light. What is the most likely effect on the rate of photosynthesis?

Accepted Answer

The rate of photosynthesis will decrease because green light is poorly absorbed by chlorophyll

Question 15

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

Accepted Answer

For the net synthesis of one G3P, the cycle must turn three times, fixing three CO$$_2$$ molecules

Question 16

Which of the following is a similarity between the electron transport chains in mitochondria and chloroplasts?

Accepted Answer

Both use chemiosmosis to generate ATP via ATP synthase

Question 17

A mutation disables the enzyme NADP$$^+$$ reductase in a plant cell. Which process would be directly affected?

Accepted Answer

The reduction of NADP$$^+ to $$NADPH in the light reactions

Question 18

Which of the following best explains why C$$_4$$ plants are more efficient than C$$_3$$ plants in hot, dry climates?

Accepted Answer

C$$_4$$ plants minimize photorespiration by spatially separating carbon fixation from the Calvin cycle

Question 19

Which of the following is a correct sequence of events in linear electron flow during the light reactions?

Accepted Answer

Photon excites PS II → Water is split → Electron transport chain → ATP synthesis → Photon excites PS I → NADP$$^+ is $$reduced

Question 20

A plant cell is exposed to a chemical that blocks ATP synthase. Which of the following processes would be directly inhibited?

Accepted Answer

The production of ATP by chemiosmosis in the light reactions

Photosynthesis: Mechanisms, Pathways, and Adaptations

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