Q: Which of the following is the correct balanced chemical equation for photosynthesis?

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

Question 1

Which of the following best explains why the extinction of dinosaurs at the end of the Cretaceous period was linked to a disruption in photosynthesis?

Accepted Answer

Debris from the asteroid blocked sunlight, reducing the ability of plants to perform photosynthesis.

Question 2

Which of the following is the correct balanced chemical equation for photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6O_2$$

Question 3

What is the primary function of chlorophyll in the process of photosynthesis?

Accepted Answer

To capture sunlight energy and convert it into chemical energy.

Question 4

Which structure in the leaf is responsible for the exchange of gases such as carbon dioxide and oxygen?

Accepted Answer

Stomata

Question 5

Why are leaves typically thin and flat in most plants?

Accepted Answer

To maximize light absorption for photosynthesis.

Question 6

Which of the following is NOT required for the process of photosynthesis?

Accepted Answer

Nitrogen ($$N_2)$$

Question 7

During the light reactions of photosynthesis, what is the main outcome?

Accepted Answer

Synthesis of ATP and NADPH

Question 8

If a plant embryo is deprived of chloroplasts, what would be the most likely outcome?

Accepted Answer

The plant would not be able to survive.

Question 9

Which pigment acts as an 'antenna' to absorb light energy and pass it to chlorophyll in photosynthesis?

Accepted Answer

Carotenoids

Question 10

What is the role of the cuticle on the outer surface of a leaf?

Accepted Answer

To reduce evaporation of water from the leaf.

Question 11

Which of the following best describes the relationship between the light reactions and the Calvin cycle in photosynthesis?

Accepted Answer

The light reactions generate ATP and NADPH, which are used in the Calvin cycle to synthesize glucose.

Question 12

Which wavelengths of visible light are primarily used by plants for photosynthesis?

Accepted Answer

Red and blue

Question 13

What would happen to the rate of photosynthesis if the temperature became extremely high?

Accepted Answer

It would decrease due to enzyme denaturation.

Question 14

Which of the following is a direct product of the splitting of water during the light reactions?

Accepted Answer

Oxygen

Question 15

Why are stromatolites significant in the study of photosynthesis evolution?

Accepted Answer

They are ancient structures formed by oxygen-producing photosynthetic bacteria.

Question 16

Which of the following best describes the role of ATP and NADPH in photosynthesis?

Accepted Answer

They provide energy and electrons for the synthesis of glucose in the Calvin cycle.

Question 17

A scientist removes all chlorophyll from a plant leaf. What is the most likely effect on the plant?

Accepted Answer

The plant will be unable to perform photosynthesis and will die.

Question 18

Which of the following is a plausible consequence if stomata on a leaf are blocked?

Accepted Answer

Gas exchange would be inhibited, reducing photosynthesis.

Question 19

Which of the following statements about oxygen in early photosynthesis is correct?

Accepted Answer

Oxygen was produced at very low concentrations before oxygenic photosynthesis evolved.

Question 20

If a plant is exposed only to green light, what would be the expected effect on its photosynthetic rate?

Accepted Answer

Photosynthetic rate would decrease because green light is mostly reflected.

Photosynthesis: Capturing Solar Energy and Its Role in Life on Earth

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