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

What is the primary function of the light reactions in photosynthesis?

Accepted Answer

To convert solar energy into chemical energy in the form of ATP and NADPH

Question 3

Which pigment is directly involved in the light reactions of photosynthesis?

Accepted Answer

Chlorophyll a

Question 4

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

Accepted Answer

NADP$$^+$$

Question 5

Which of the following best explains why green light is least effective for photosynthesis?

Accepted Answer

Chlorophyll reflects and transmits green light rather than absorbing it

Question 6

What is the role of rubisco in the Calvin cycle?

Accepted Answer

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

Question 7

Which of the following statements correctly compares 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 8

Which process is unique to C$$_4$$ plants and helps them minimize photorespiration?

Accepted Answer

Initial fixation of CO$$_2 by $$PEP carboxylase in mesophyll cells

Question 9

A CAM plant is most likely to be found in which environment, and what adaptation does it have for survival?

Accepted Answer

Arid environments; it opens stomata at night to reduce water loss

Question 10

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

Accepted Answer

ATP only

Question 11

If a plant's stomata are closed during the day due to drought, which process is most likely to increase?

Accepted Answer

Photorespiration

Question 12

Which of the following best describes the role of the spectrophotometer in photosynthesis research?

Accepted Answer

It measures the absorption of different wavelengths of light by pigments

Question 13

Which step in the Calvin cycle directly uses NADPH?

Accepted Answer

Reduction of 3-phosphoglycerate to G3P

Question 14

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

Accepted Answer

Glucose

Question 15

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

Accepted Answer

They broaden the spectrum of light that can be used for photosynthesis

Question 16

Which of the following statements about photorespiration is correct?

Accepted Answer

It consumes oxygen and organic fuel without producing ATP or sugar

Question 17

In the Calvin cycle, how many molecules of CO$$_2$$ must enter the cycle to produce one net G3P molecule?

Accepted Answer

$$3$$

Question 18

Which of the following is true regarding the spatial organization of chemiosmosis in chloroplasts versus mitochondria?

Accepted Answer

ATP synthesis occurs on the stroma side in chloroplasts and in the matrix in mitochondria

Question 19

Which of the following best explains why C$$_4$$ and CAM plants have evolved alternative carbon fixation pathways?

Accepted Answer

To minimize water loss and reduce photorespiration in hot, arid environments

Question 20

Which molecule is regenerated during the third phase of the Calvin cycle, allowing the cycle to continue?

Accepted Answer

Ribulose bisphosphate (RuBP)

Ch.10-Photosynthesis: Mechanisms, Structures, and Adaptations

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