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

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

Question 1

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

Accepted Answer

$$6 \ \mathrm{CO}_2 + 12 \ \mathrm{H}_2\mathrm{O} + 	ext{Light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \ \mathrm{O}_2 + 6 \ \mathrm{H}_2\mathrm{O}$$

Question 2

What is the primary function of the light reactions in photosynthesis?

Accepted Answer

To convert solar energy into the chemical energy of ATP and NADPH

Question 3

Which structure within the chloroplast is the site of the Calvin cycle?

Accepted Answer

Stroma

Question 4

During photosynthesis, which molecule is oxidized and which is reduced?

Accepted Answer

$$\mathrm{H}_2\mathrm{O} is $$oxidized and $$\mathrm{CO}_2 is $$reduced

Question 5

Which pigment is primarily responsible for capturing light energy in plants?

Accepted Answer

Chlorophyll a

Question 6

Why do leaves appear green to the human eye?

Accepted Answer

Chlorophyll reflects and transmits green wavelengths of light

Question 7

Which of the following best explains why the Calvin cycle is dependent on the light reactions?

Accepted Answer

The Calvin cycle requires ATP and NADPH produced by the light reactions

Question 8

What is the role of stomata in plant leaves?

Accepted Answer

They allow for gas exchange, letting $$\mathrm{CO}_2 in $$and $$\mathrm{O}_2$$ out

Question 9

Which of the following statements about the electromagnetic spectrum is correct?

Accepted Answer

Visible light has wavelengths between 380 nm and 740 nm

Question 10

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

Accepted Answer

The rate of photosynthesis will decrease because green light is least effective

Question 11

Which of the following is a correct description of autotrophs?

Accepted Answer

They produce organic molecules from $$\mathrm{CO}_2$$ and other inorganic molecules

Question 12

What is the main evolutionary advantage of having accessory pigments like chlorophyll b and carotenoids?

Accepted Answer

They broaden the spectrum of light that can be used for photosynthesis

Question 13

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

Accepted Answer

Incorporation of $$\mathrm{CO}_2$$ into organic molecules during the Calvin cycle

Question 14

Why is photosynthesis considered an endergonic process?

Accepted Answer

It requires an input of energy from light to drive the reactions

Question 15

Which of the following organisms can perform photosynthesis?

Accepted Answer

Cyanobacteria

Question 16

What is the function of NADP$$^+ in $$the light reactions of photosynthesis?

Accepted Answer

It acts as an electron acceptor, becoming reduced to NADPH

Question 17

Which of the following best explains why almost all heterotrophs depend on photoautotrophs?

Accepted Answer

Photoautotrophs produce food and oxygen required by heterotrophs

Question 18

A mutation causes a plant to lack thylakoid membranes. Which process would be directly affected?

Accepted Answer

The light reactions of photosynthesis

Question 19

Which of the following statements about the action spectrum of photosynthesis is correct?

Accepted Answer

It shows that violet-blue and red light are most effective for driving photosynthesis

Question 20

If a plant's stomata are closed during a hot, dry day, what is the most likely immediate effect on photosynthesis?

Accepted Answer

Photosynthesis will decrease due to limited $$\mathrm{CO}_2$$ uptake

Photosynthesis: Mechanisms and Importance (Chapter 10 Study Notes)

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