Q: Which of the following equations correctly represents the overall process of photosynthesis?

$6CO_2 + 6H_2O + light \\rightarrow C_6H_{12}O_6 + 6O_2$

Question 1

Which of the following best describes the process of carbon fixation during photosynthesis?

Accepted Answer

The conversion of carbon dioxide into organic molecules using the energy from ATP and NADPH.

Question 2

A plant is exposed only to green light. What is the most likely effect on its rate of photosynthesis, and why?

Accepted Answer

Photosynthesis will decrease because green light is mostly reflected, not absorbed, by chlorophyll.

Question 3

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

$6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6O_2$

Question 4

Which plant organ is primarily responsible for photosynthesis, and what structural feature makes it especially suited for this function?

Accepted Answer

The leaf, because it contains a high density of chloroplasts and a large surface area for light absorption.

Question 5

Which of the following best explains the relationship between photosynthesis and cellular respiration in plants?

Accepted Answer

Photosynthesis stores energy in glucose molecules, while cellular respiration releases that energy for cellular work.

Question 6

Which of the following is the correct sequence of events in the light reactions of photosynthesis?

Accepted Answer

Absorption of light by chlorophyll, excitation of electrons, transfer to primary electron acceptor, production of ATP and NADPH.

Question 7

Which of the following statements about NADPH is correct?

Accepted Answer

NADPH is the reduced form, while NADP$^+$ is the oxidized form.

Question 8

Where in the chloroplast do the light reactions and the Calvin cycle occur, respectively?

Accepted Answer

Light reactions occur in the thylakoid membranes; the Calvin cycle occurs in the stroma.

Question 9

Which of the following is a major implication of global deforestation on the carbon cycle?

Accepted Answer

It reduces the amount of carbon dioxide removed from the atmosphere, contributing to climate change.

Question 10

Which pigment is primarily responsible for absorbing light energy for photosynthesis, and what wavelengths does it absorb most efficiently?

Accepted Answer

Chlorophyll a; absorbs most efficiently in the blue-violet and red regions of the visible spectrum.

Question 11

A scientist is studying a plant that opens its stomata only at night to minimize water loss. Which type of photosynthetic adaptation does this plant most likely exhibit?

Accepted Answer

CAM photosynthesis

Question 12

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

Accepted Answer

They absorb wavelengths of light not absorbed by chlorophyll and protect the plant from damage by excess light.

Question 13

Which of the following is a correct comparison between C-3 and C-4 plants?

Accepted Answer

C-4 plants have a mechanism to minimize photorespiration by spatially separating carbon fixation from the Calvin cycle.

Question 14

A photon of light is absorbed by a pigment molecule. What happens to the electron in the pigment molecule?

Accepted Answer

It is raised from the ground state to an excited state.

Question 15

Which of the following best explains why leaves appear green to our eyes?

Accepted Answer

Chlorophyll reflects green wavelengths of light and absorbs other wavelengths.

Question 16

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

Accepted Answer

NADPH

Question 17

A plant cell is placed in an environment with very high oxygen and low carbon dioxide. Which process is likely to increase, and what is the consequence for the plant?

Accepted Answer

Photorespiration will increase, reducing the efficiency of photosynthesis.

Question 18

Which of the following best describes the role of the primary electron acceptor in a photosystem?

Accepted Answer

It captures excited electrons from the reaction center chlorophyll and transfers them to the electron transport chain.

Question 19

Which of the following is NOT a reactant in the process of photosynthesis?

Accepted Answer

Oxygen ($O_2$)

Question 20

Which of the following best explains why biofuels are considered renewable compared to fossil fuels?

Accepted Answer

Biofuels are produced from recently living organisms that can be replenished, while fossil fuels take millions of years to form.

Photosynthesis: Using Light to Make Food (Chapter 7) – Study Notes

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