Q: Which of the following best describes the overall chemical equation for photosynthesis?

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

Question 1

Which of the following best describes the overall chemical equation for 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 2

Which structure within the chloroplast is primarily responsible for the light reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 3

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

Accepted Answer

To use ATP and NADPH to convert CO$$_2$$ into G3P (a sugar)

Question 4

Which pigment is the primary light-capturing molecule in the chloroplast?

Accepted Answer

Chlorophyll a

Question 5

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

Accepted Answer

NADP$$^+$$

Question 6

Which of the following statements about cyclic electron flow in photosynthesis is correct?

Accepted Answer

It produces ATP but not NADPH or O$$_2$$

Question 7

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

Accepted Answer

It donates electrons to replace those lost by P680 in Photosystem II

Question 8

Which enzyme catalyzes the fixation of CO$$_2 in $$the Calvin cycle?

Accepted Answer

Rubisco (Ribulose bisphosphate carboxylase/oxygenase)

Question 9

Why do C$$_4$$ plants have an advantage over C$$_3$$ plants in hot, arid climates?

Accepted Answer

They minimize photorespiration by spatially separating carbon fixation from the Calvin cycle

Question 10

Which of the following best explains why leaves appear green to the human eye?

Accepted Answer

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

Question 11

What is the main difference between chemiosmosis in mitochondria and chloroplasts?

Accepted Answer

Mitochondria use chemical energy from food, while chloroplasts use light energy

Question 12

Which of the following is a correct statement about photorespiration?

Accepted Answer

It consumes O$$_2$$ and organic fuel without producing ATP or sugar

Question 13

In CAM plants, how is carbon fixation temporally separated from the Calvin cycle?

Accepted Answer

CO$$_2 is $$fixed at night and used in the Calvin cycle during the day

Question 14

Which of the following best describes the function of carotenoids in photosynthesis?

Accepted Answer

They broaden the spectrum of light that can drive photosynthesis and provide photoprotection

Question 15

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

Accepted Answer

Photosystem I (P700)

Question 16

If a plant's thylakoid membrane is punctured so that the interior of the thylakoid is no longer separated from the stroma, which process will be most directly affected?

Accepted Answer

Synthesis of ATP

Question 17

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

Accepted Answer

Glyceraldehyde 3-phosphate (G3P)

Question 18

How many molecules of ATP and NADPH are required for the net synthesis of one G3P molecule in the Calvin cycle?

Accepted Answer

$$9$$ ATP and $$6$$ NADPH

Question 19

Which of the following best explains why photoautotrophs are considered the producers of the biosphere?

Accepted Answer

They convert inorganic molecules into organic molecules using light energy

Question 20

A scientist genetically modifies a rice plant to use the C$$_4$$ pathway. What is the most likely result in a hot, dry environment?

Accepted Answer

The rice plant will have increased yield due to reduced photorespiration

Photosynthesis: Mechanisms, Pigments, and Adaptations

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