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 in the electron transport chain?

Accepted Answer

NADP$$^+$$

Question 3

Which pigment is primarily responsible for absorbing light energy in the chloroplasts of green plants?

Accepted Answer

Chlorophyll a

Question 4

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

Accepted Answer

To fix carbon dioxide and produce G3P (a sugar)

Question 5

Which of the following environmental factors would most likely decrease the rate of photosynthesis in a plant?

Accepted Answer

Low light intensity

Question 6

In the process of chemiosmosis during the light reactions, ATP is produced as protons flow through which enzyme?

Accepted Answer

ATP synthase

Question 7

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

Accepted Answer

Thylakoid membrane

Question 8

If a plant is exposed only to green light, what would you expect to happen to its rate of photosynthesis?

Accepted Answer

It would decrease because chlorophyll reflects green light

Question 9

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 10

What is the role of rubisco in the Calvin cycle?

Accepted Answer

It catalyzes the fixation of CO$$_2 to $$RuBP

Question 11

Which of the following statements correctly compares photosystem II and photosystem I?

Accepted Answer

Photosystem II splits water and releases oxygen, while photosystem I does not

Question 12

During photosynthesis, where do the oxygen atoms in the O$$_2$$ produced come from?

Accepted Answer

Water ($$H_2O)$$

Question 13

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

Accepted Answer

Photosynthesis stores energy in organic molecules, while respiration releases it

Question 14

A scientist measures the pH in the stroma and thylakoid space of a chloroplast exposed to light. What would she most likely observe?

Accepted Answer

Lower pH in the thylakoid space than in the stroma

Question 15

For the net synthesis of one G3P molecule in the Calvin cycle, how many molecules of ATP and NADPH are consumed?

Accepted Answer

9 ATP and 6 NADPH

Question 16

Which of the following is a direct product of the light reactions that is used in the Calvin cycle?

Accepted Answer

NADPH

Question 17

A plant exposed to high temperatures and closed stomata will most likely experience which of the following?

Accepted Answer

Decreased photosynthetic efficiency due to reduced CO$$_2$$ uptake

Question 18

Which of the following best describes the absorption spectrum of chlorophyll a?

Accepted Answer

It absorbs light most strongly in the violet-blue and red regions

Question 19

Which of the following steps occurs first in the light reactions of photosynthesis?

Accepted Answer

Absorption of light by chlorophyll in photosystem II

Question 20

Which of the following best explains why ATP and NADPH are needed in the Calvin cycle?

Accepted Answer

They provide energy and reducing power for carbon fixation

M9- Photosynthesis: Mechanisms, Structures, and Energy Flow in Plants

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