Q: Which equation correctly summarizes the process of photosynthesis?

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

Q: Which of the following is oxidized and which is reduced during photosynthesis?

$$\text{H}_2\text{O} is $$oxidized and $$\text{CO}_2 is $$reduced

Question 1

Which of the following best describes the role of autotrophs in an ecosystem?

Accepted Answer

They produce organic molecules from inorganic materials using energy from sunlight or chemicals.

Question 2

Which equation correctly summarizes the process of photosynthesis?

Accepted Answer

$$6 	ext{CO}_2 + 6 	ext{H}_2	ext{O} ightarrow 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2$$

Question 3

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

Accepted Answer

Thylakoid membrane

Question 4

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

Accepted Answer

To synthesize simple sugars from carbon dioxide

Question 5

Which of the following is a product of the light-dependent reactions that is used in the Calvin Cycle?

Accepted Answer

ATP

Question 6

Why do leaves appear green to the human eye?

Accepted Answer

They reflect green light and absorb red and blue light.

Question 7

Which wavelengths of light are most effective in driving photosynthesis?

Accepted Answer

Blue-violet and red

Question 8

What is the source of electrons for the light-dependent reactions of photosynthesis?

Accepted Answer

Water

Question 9

Which enzyme catalyzes the first step of carbon fixation in the Calvin Cycle?

Accepted Answer

RuBisCO

Question 10

In the process of chemiosmosis during photosynthesis, where is the proton gradient established?

Accepted Answer

Across the thylakoid membrane, with high concentration in the thylakoid space

Question 11

Which of the following best explains why accessory pigments are important in photosynthesis?

Accepted Answer

They increase the range of light absorption, enhancing photosynthetic efficiency.

Question 12

Which of the following is oxidized and which is reduced during photosynthesis?

Accepted Answer

$$	ext{H}_2	ext{O} is $$oxidized and $$	ext{CO}_2 is $$reduced

Question 13

A plant is exposed only to green light. What will most likely happen to its rate of photosynthesis?

Accepted Answer

It will decrease because green light is mostly reflected, not absorbed.

Question 14

Which of the following is a correct comparison between chemiosmosis in mitochondria and chloroplasts?

Accepted Answer

Both use an electron transport chain to create a proton gradient that drives ATP synthesis.

Question 15

Which of the following is a direct product of the Calvin Cycle?

Accepted Answer

Glyceraldehyde-3-phosphate (G3P)

Question 16

A scientist exposes a filamentous alga to different wavelengths of light and observes the distribution of oxygen-seeking bacteria. What does this experiment demonstrate?

Accepted Answer

Oxygen production is highest at wavelengths absorbed by chlorophyll.

Question 17

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

Accepted Answer

They are released as molecular oxygen ($$	ext{O}_2).$$

Question 18

Which of the following is NOT a product of the light-dependent reactions?

Accepted Answer

Glucose

Question 19

Which of the following statements about the relationship between photosynthesis and cellular respiration is correct?

Accepted Answer

Photosynthesis stores energy in glucose, while respiration releases energy from glucose.

Question 20

A plant cell is unable to regenerate ribulose-1,5-bisphosphate (RuBP). Which phase of the Calvin Cycle is directly affected?

Accepted Answer

Regeneration of the CO2 acceptor

Photosynthesis: Mechanisms, Structures, and Ecological Importance

Study Guide - Practice Questions

Study Guide - Flashcards