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

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

Question 1

Which of the following organisms is classified as a photosynthetic autotroph and is responsible for producing the majority of oxygen in aquatic environments?

Accepted Answer

Photosynthetic protists such as kelp

Question 2

What is the main function of the thylakoid membranes within the chloroplast during photosynthesis?

Accepted Answer

To house the light reactions that convert solar energy to chemical energy

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

They are transferred to NADP$$^+ to $$form NADPH

Question 5

Which pigment is primarily responsible for absorbing blue-violet and red light and directly participates in the light reactions?

Accepted Answer

Chlorophyll a

Question 6

Why do leaves appear green to our eyes?

Accepted Answer

They reflect green light and absorb red and blue light

Question 7

What is the main adaptive advantage of CAM plants in arid environments?

Accepted Answer

They open their stomata at night to minimize water loss

Question 8

Which of the following best explains why photorespiration is considered a wasteful process in C$$_3$$ plants?

Accepted Answer

It consumes O$$_2$$ and organic fuel while releasing CO$$_2$$ without producing ATP or sugar

Question 9

Which of the following is a correct comparison between the electron transport chains (ETC) in cellular respiration and photosynthesis?

Accepted Answer

O$$_2 is $$released as a byproduct in photosynthesis, but is the final electron acceptor in cellular respiration

Question 10

In the Calvin cycle, what is the role of the enzyme rubisco?

Accepted Answer

It adds CO$$_2 to $$RuBP, initiating carbon fixation

Question 11

A scientist exposes a string of algal cells to a spectrum of light and observes that oxygen-seeking bacteria cluster around regions exposed to red and blue light. What conclusion can be drawn from this experiment?

Accepted Answer

Chloroplasts absorb light mainly in the blue-violet and red-orange parts of the spectrum

Question 12

Which of the following is a direct product of the Calvin cycle that can be used to synthesize glucose and other organic molecules?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 13

Which major biological theme is illustrated by the fact that most ecosystems depend on photosynthesis to convert sunlight into high-energy organic molecules?

Accepted Answer

Pathways that transform energy and matter

Question 14

What is the main function of carotenoids in the chloroplast?

Accepted Answer

To absorb and dissipate excessive light energy that might damage chlorophyll

Question 15

Which of the following statements about the products of photosynthesis is correct?

Accepted Answer

Plants produce both monomers like glucose and polymers like starch and cellulose

Question 16

Which adaptation allows C$$_4$$ plants to continue photosynthesis during hot and dry weather?

Accepted Answer

They close their stomata to save water and use a special pathway to fix CO$$_2$$

Question 17

Which of the following best describes the relationship between the structure of the thylakoid membrane and its function in photosynthesis?

Accepted Answer

The folded shape increases surface area for membrane-bound enzymes to drive photosynthetic reactions

Question 18

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose

Question 19

What is the main reason why cellular respiration produces more ATP than photosynthesis?

Accepted Answer

Cellular respiration receives more electrons in its electron transport chain

Question 20

Which of the following statements about the stomata of a leaf is correct?

Accepted Answer

Stomata are pores that allow gas exchange, letting CO$$_2 in $$and O$$_2$$ out

Photosynthesis: Using Light to Make Food

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