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

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

Question 1

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

Accepted Answer

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

Question 2

Which structure within the chloroplast is the primary site of the light reactions of photosynthesis?

Accepted Answer

Thylakoid membrane

Question 3

During the light reactions of photosynthesis, what is the fate of the electrons extracted from water?

Accepted Answer

They are used to reduce NADP$$^+ to $$NADPH

Question 4

Which of the following best explains why plants appear green to the human eye?

Accepted Answer

Chlorophyll reflects green light and absorbs other wavelengths

Question 5

Which of the following is a correct description of the Calvin cycle?

Accepted Answer

It uses ATP and NADPH to convert CO$$_2$$ into carbohydrates

Question 6

Which of the following organisms is NOT capable of photosynthesis?

Accepted Answer

Lions

Question 7

What is the main role of NADPH in photosynthesis?

Accepted Answer

To provide reducing power for the Calvin cycle

Question 8

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

Accepted Answer

Photosynthesis uses visible light, primarily in the violet-blue and red regions

Question 9

Which process is responsible for the production of ATP during the light reactions of photosynthesis?

Accepted Answer

Photophosphorylation

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 significantly

Question 11

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases it

Question 12

Which pigment is directly involved in the light reactions of photosynthesis?

Accepted Answer

Chlorophyll a

Question 13

What is the primary function of stomata in plant leaves?

Accepted Answer

To allow gas exchange of CO$$_2$$ and O$$_2$$

Question 14

Which of the following is a correct statement about the fate of oxygen produced during photosynthesis?

Accepted Answer

It is released as a byproduct into the atmosphere

Question 15

Which of the following best explains why oxygen is considered a byproduct of the light reactions?

Accepted Answer

Oxygen is produced when water is split to provide electrons for the electron transport chain

Question 16

Which of the following is an example of a heterotroph?

Accepted Answer

Lion

Question 17

What is the main difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP, while oxidative phosphorylation uses a proton gradient and ATP synthase

Question 18

Which of the following best describes the role of photosystems in the light reactions?

Accepted Answer

They capture light energy and transfer excited electrons to electron acceptors

Question 19

Which of the following wavelengths of light would provide the most energy for photosynthesis?

Accepted Answer

450 nm (blue light)

Question 20

A scientist uses a spectrophotometer to analyze a pigment solution. If the solution absorbs most light at 430 nm and transmits most at 550 nm, what color does the solution appear?

Accepted Answer

Green

Photosynthesis: Mechanisms, Organisms, and Light Reactions Unit 3

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