Question 1

Which of the following best describes the overall process of photosynthesis in plants?

Accepted Answer

Conversion of solar energy to chemical energy stored in sugar

Question 2

Which equation correctly represents the overall chemical reaction for photosynthesis?

Accepted Answer

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

Question 3

Which organelle is responsible for photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 4

What is the role of chlorophyll in photosynthesis?

Accepted Answer

It absorbs light energy and converts it to chemical energy

Question 5

During the light reactions of photosynthesis, what is the primary function of the electron transport chain?

Accepted Answer

To pump $H^+$ ions into the thylakoid space, creating a gradient for ATP synthesis

Question 6

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

Accepted Answer

ATP

Question 7

What is the significance of carbon fixation in the Calvin cycle?

Accepted Answer

It incorporates inorganic $CO_2$ into organic molecules

Question 8

Which color of visible light is least effective for driving photosynthesis, and why?

Accepted Answer

Green, because chlorophyll reflects green light

Question 9

In the context of redox reactions in photosynthesis, which molecule is oxidized and which is reduced?

Accepted Answer

Water is oxidized and carbon dioxide is reduced

Question 10

Why do intact chloroplasts not release heat when illuminated, unlike a solution of isolated chlorophyll?

Accepted Answer

Because the energy is used to excite electrons that are transferred to the electron transport chain

Question 11

Which of the following statements about photoautotrophs is correct?

Accepted Answer

They produce food using energy from sunlight

Question 12

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

Accepted Answer

To reduce $CO_2$ to sugar

Question 13

Which of the following best explains why two photons of light are required in the movement of electrons from water to NADP+ during the light reactions?

Accepted Answer

One photon excites electrons in photosystem II and another in photosystem I

Question 14

Which of the following is NOT required for a plant to perform photosynthesis?

Accepted Answer

Oxygen

Question 15

If a plant is supplied with $CO_2$ in the dark, what else must be provided for it to produce sugar?

Accepted Answer

ATP and NADPH

Question 16

Which of the following best describes the function of carotenoids in plant cells?

Accepted Answer

They protect chlorophyll from damage by excessive light

Question 17

Which process in photosynthesis is most directly responsible for the release of oxygen gas?

Accepted Answer

Splitting of water molecules during the light reactions

Question 18

Which of the following is a correct description of the role of the primary electron acceptor in a photosystem?

Accepted Answer

It receives photoexcited electrons from reaction-center chlorophyll a

Question 19

Which of the following statements about heterotrophs is true?

Accepted Answer

They consume plants, animals, or decompose organic material for energy

Question 20

Which of the following best explains the global significance of photosynthesis?

Accepted Answer

It is the primary source of oxygen and organic matter for most life on Earth

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

Study Guide - Practice Questions

Study Guide - Flashcards