Question 1

What is produced in the electron transport system associated with photosystem II?

Accepted Answer

The electron transport system associated with photosystem II primarily produces ATP through photophosphorylation. Additionally, it contributes to the splitting of water molecules, releasing O₂ as a byproduct, but the direct product of the electron transport chain is ATP.

Question 2

The role of water in photosynthesis is to

Accepted Answer

The answer of The role of water in photosynthesis is...

Question 3

The light reactions of photosynthesis result in which of the following?

Accepted Answer

The answer of The light reactions of photosynthesis result in...

Question 4

Which of the following is a source of electrons that plants use for reduction reactions during photosynthesis?

Accepted Answer

Water (H₂O) is the source of electrons for reduction reactions in photosynthesis, specifically during the light-dependent reactions where water is split to release electrons, protons, and oxygen.

Question 5

The ATP and NADPH synthesized during the light reactions are

Accepted Answer

ATP and NADPH produced during the light reactions of photosynthesis are used in the Calvin cycle, which takes place in the stroma of the chloroplast.

Question 6

Which of the following statements about the light reactions of photosynthesis is FALSE?

Accepted Answer

NADPH is not oxidized to NADP+ during the light reactions; instead, NADP+ is reduced to NADPH.

Question 7

The NADPH required for carbon dioxide fixation during the Calvin cycle is formed

Accepted Answer

NADPH is produced during the light reactions of photosynthesis, which occur in the thylakoid membranes of chloroplasts.

Question 8

From where does the O₂ released during the light reactions of photosynthesis come?

Accepted Answer

The O₂ released during the light reactions of photosynthesis comes from the splitting of water (H₂O) molecules. This process is known as photolysis.

Question 9

The energy of the movement of electrons down a concentration gradient via electron transport within the thylakoid membrane is used to generate

Accepted Answer

The energy from electrons moving down the electron transport chain in the thylakoid membrane is used to pump protons across the membrane, creating a proton gradient. This gradient is then used by ATP synthase to produce ATP.

Question 10

Suppose you are studying photosynthesis in a research lab. You grow your plants in a chamber with a source of water that has a radioactively labeled oxygen atom. What photosynthetic product will be radioactive?

Accepted Answer

During photosynthesis, water molecules are split in the light-dependent reactions, releasing oxygen gas (O₂). If the oxygen in the water is radioactively labeled, the released O₂ gas will be radioactive.

Question 11

During the process of photosynthesis, solar energy is converted to

Accepted Answer

During photosynthesis, plants convert solar energy into chemical energy stored in glucose molecules.

Question 12

The energy of the movement of electrons down a concentration gradient via electron transport within chloroplasts and mitochondria is used to generate

Accepted Answer

The movement of electrons down a concentration gradient in the electron transport chain within chloroplasts and mitochondria is used to generate ATP through a process called chemiosmosis.

Question 13

Hydrogen ions cross the thylakoid membranes from the stroma by

Accepted Answer

Hydrogen ions cross the thylakoid membranes from the stroma by active transport, using energy from ATP or the electron transport chain to move against their concentration gradient.

Question 14

The primary function of the light reactions of photosynthesis is to

Accepted Answer

The light reactions of photosynthesis convert light energy into chemical energy in the form of ATP and NADPH, which are then used in the Calvin cycle to synthesize glucose.

Question 15

Which of the following provides O₂ as an end product?

Accepted Answer

The light reactions of photosynthesis, which occur in the thylakoid membranes of chloroplasts, split water molecules to release oxygen as a byproduct.

Question 16

Which sequence accurately describes the flow of electrons in photosynthesis?

Accepted Answer

The correct sequence is H₂O -photosystem II -photosystem I -NADP. In photosynthesis, water is split by photosystem II, releasing electrons that are then passed to photosystem I. Photosystem I then uses these electrons to reduce NADP+ to NADPH.

Question 17

Which process of photosynthesis is directly linked to the production of ATP?

Accepted Answer

Photosystem II is directly involved in the production of ATP through the process of photophosphorylation, where the energy from light is used to pump protons across the thylakoid membrane, creating a proton gradient that drives ATP synthesis.

Question 18

Light reactions produce

Accepted Answer

The light reactions of photosynthesis produce ATP, NADPH, and O₂ as byproducts. ATP and NADPH are used in the Calvin cycle, while O₂ is released as a byproduct.

Question 19

Which of the following statements is TRUE about the light reactions?

Accepted Answer

Photosystem II generates ATP through photophosphorylation, while photosystem I generates NADPH by transferring electrons to NADP+.

Question 20

You are carrying out an experiment on several aquatic plants in your fish tank. You decide to expose two of the plants to green light and two to blue light. You want to determine which type of light is best for the light reactions, so to reach your conclusions, you decide to record the amount of oxygen bubbles produced. Which of the following results would be expected?

Accepted Answer

Blue light is more effective for photosynthesis than green light because chlorophyll absorbs blue light more efficiently, leading to more oxygen production.

Quiz 7: Capturing Solar Energy: Photosynthesis