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

Accepted Answer

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

Question 2

Which structure within the chloroplast is primarily responsible for capturing light energy during photosynthesis?

Accepted Answer

Thylakoid membrane

Question 3

What is the main function of the Calvin Cycle in photosynthesis?

Accepted Answer

To convert carbon dioxide into glucose

Question 4

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

Accepted Answer

Chlorophyll a

Question 5

Why do plants appear green to our eyes?

Accepted Answer

They reflect and transmit green wavelengths of light

Question 6

Which of the following best explains why the burning of fossil fuels is problematic for the climate, while burning biofuels is not as problematic?

Accepted Answer

Fossil fuels release carbon that has been stored for millions of years, increasing atmospheric $$CO_2$$, while biofuels recycle carbon already in the atmosphere

Question 7

During the light reactions of photosynthesis, what is the primary role of water ($$H_2O$$)?

Accepted Answer

To provide electrons by being split, releasing $$O_2 as a $$byproduct

Question 8

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

Accepted Answer

The rate of photosynthesis will decrease because green light is mostly reflected, not absorbed

Question 9

Which of the following statements about autotrophs is correct?

Accepted Answer

Autotrophs produce their own organic molecules from inorganic sources

Question 10

Which process in photosynthesis is directly responsible for the production of ATP?

Accepted Answer

Chemiosmosis via ATP synthase during the light reactions

Question 11

A scientist measures the rate of $$O_2$$ production in a plant under different wavelengths of light. Under which color of light would you expect the highest rate of $$O_2$$ production, and why?

Accepted Answer

Blue and red, because these wavelengths are most efficiently absorbed by chlorophyll

Question 12

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

Accepted Answer

It carries high-energy electrons to the Calvin Cycle for carbon fixation

Question 13

If a plant closes its stomata on a hot, dry day, what is the most immediate effect on photosynthesis?

Accepted Answer

Reduced $$CO_2$$ intake, leading to decreased photosynthetic rate

Question 14

Which of the following is a direct product of the Calvin Cycle?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 15

Which of the following best explains why the Calvin Cycle is sometimes called the 'dark reactions'?

Accepted Answer

It does not require light directly, but uses products of the light reactions

Question 16

A plant adapted to hot, dry environments uses a 4-carbon compound to initially fix $$CO_2. $$What is the main advantage of this adaptation?

Accepted Answer

It allows the plant to minimize water loss while still capturing $$CO_2$$

Question 17

Which of the following is a real-world consequence of increased atmospheric $$CO_2$$ due to human activity?

Accepted Answer

Enhanced greenhouse effect leading to global warming

Question 18

Which of the following best describes the flow of energy in photosynthesis?

Accepted Answer

Light energy is converted to chemical energy stored in glucose

Question 19

If a mutation prevented a plant from producing ATP synthase, which step of photosynthesis would be directly affected?

Accepted Answer

The production of ATP during the light reactions

Question 20

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

Accepted Answer

Glucose

Photosynthesis: Converting Light Energy to Chemical Energy

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