Question 1

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

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 2

During the light reactions of photosynthesis, which molecule acts as the final electron acceptor?

Accepted Answer

NADP$$^+$$

Question 3

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

Accepted Answer

It uses ATP and NADPH to convert CO$$_2$$ into G3P.

Question 4

A plant is exposed to light with a wavelength of 700 nm. Which photosystem is primarily activated?

Accepted Answer

Photosystem I

Question 5

Which of the following best explains why leaves appear green?

Accepted Answer

Chlorophyll absorbs violet-blue and red light, reflecting green light.

Question 6

What is the main role of water in the light reactions of photosynthesis?

Accepted Answer

It donates electrons to replace those lost by chlorophyll in Photosystem II.

Question 7

Which enzyme is responsible for carbon fixation in the Calvin cycle?

Accepted Answer

Rubisco

Question 8

In which part of the chloroplast do the light reactions take place?

Accepted Answer

Thylakoid membrane

Question 9

Which of the following is a direct product of the Calvin cycle that can be used to synthesize glucose?

Accepted Answer

Glyceraldehyde 3-phosphate (G3P)

Question 10

How does chemiosmosis in chloroplasts differ from that in mitochondria?

Accepted Answer

Protons diffuse from the thylakoid space to the stroma in chloroplasts, but from the intermembrane space to the matrix in mitochondria.

Question 11

A mutation disables the enzyme ATP synthase in a plant cell. Which process would be directly affected?

Accepted Answer

Production of ATP during the light reactions

Question 12

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

The products of one process are the reactants of the other.

Question 13

If a plant is placed in an environment with no CO$$_2$$, which stage of photosynthesis would be directly inhibited?

Accepted Answer

The Calvin cycle

Question 14

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

Accepted Answer

Glucose

Question 15

A scientist measures the absorption spectrum of two pigments: chlorophyll a and chlorophyll b. Which statement is correct?

Accepted Answer

Chlorophyll a and b absorb light at different wavelengths due to structural differences.

Question 16

Which of the following best explains why photoautotrophs are essential for life on Earth?

Accepted Answer

They convert solar energy into chemical energy and produce O$$_2.$$

Question 17

A plant cell is exposed to a chemical that blocks the regeneration of RuBP. What is the most immediate effect?

Accepted Answer

The Calvin cycle would stop after a few turns because CO$$_2$$ could no longer be fixed.

Question 18

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

Accepted Answer

The Calvin cycle is anabolic and consumes ATP, while the citric acid cycle is catabolic and produces ATP.

Question 19

A leaf is covered with petroleum jelly, blocking its stomata. Which process would be most directly affected?

Accepted Answer

Gas exchange of CO$$_2$$ and O$$_2$$

Question 20

Which of the following best describes photophosphorylation?

Accepted Answer

The process of generating ATP from ADP and inorganic phosphate using light energy

Photosynthesis: Structure, Function, and Key Concepts (Campbell Biology in Focus, Chapter 8)

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