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

Atmospheric carbon dioxide ($$\text{CO}_2)$$

Question 1

Which of the following best describes the main function of chloroplasts in plant cells?

Accepted Answer

To convert light energy into chemical energy through photosynthesis

Question 2

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

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

Question 3

Which of the following is a direct input to the Calvin cycle (light-independent reactions) of photosynthesis?

Accepted Answer

NADPH

Question 4

A plant is exposed only to green light. What is the most likely outcome for its rate of photosynthesis?

Accepted Answer

It will decrease because chlorophyll does not efficiently absorb green light.

Question 5

Which of the following best explains why plants are green?

Accepted Answer

Photosynthetic pigments do not absorb green light.

Question 6

Which molecule donates electrons to the reaction center of Photosystem II during the light-dependent reactions?

Accepted Answer

Water ($$	ext{H}_2	ext{O})$$

Question 7

Which of the following processes is common to both the light-dependent reactions of photosynthesis and cellular respiration?

Accepted Answer

Chemiosmosis

Question 8

If a plant cannot perform photosynthesis, which molecule would give it the best chance of survival and growth?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 9

Where in the chloroplast do the light-dependent reactions of photosynthesis occur?

Accepted Answer

Thylakoid membrane

Question 10

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

Accepted Answer

6

Question 11

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

Accepted Answer

Rubisco

Question 12

What is the main role of accessory pigments such as carotenoids in photosynthesis?

Accepted Answer

To absorb and dissipate excessive light energy that could damage chlorophyll

Question 13

Which of the following best describes an autotroph?

Accepted Answer

An organism that synthesizes its own organic food from inorganic substances

Question 14

What is the main source of carbon atoms in the biomass of a plant?

Accepted Answer

Atmospheric carbon dioxide ($$	ext{CO}_2)$$

Question 15

Which of the following is a product of the light-dependent reactions of photosynthesis?

Accepted Answer

NADPH

Question 16

Which of the following best explains why the Calvin cycle is sometimes called the 'dark reactions'?

Accepted Answer

It does not require direct light to proceed

Question 17

What is the main function of the electron transport chain in the light-dependent reactions?

Accepted Answer

To generate a proton gradient for ATP synthesis

Question 18

Which of the following is NOT a direct input for the Calvin cycle?

Accepted Answer

O$$_2$$

Question 19

How much ATP does a plant cell use to make one molecule of glucose via the Calvin cycle?

Accepted Answer

18

Question 20

Which of the following best describes the fate of oxygen produced during photosynthesis?

Accepted Answer

It is released as a byproduct into the atmosphere

Photosynthesis: Mechanisms, Structures, and Ecological Importance

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