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 pigment is primarily responsible for absorbing light energy during photosynthesis in most plants, and at which wavelengths does it absorb most strongly?

Accepted Answer

Chlorophyll a; absorbs most strongly in the blue and red regions of the spectrum

Question 3

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

Accepted Answer

Chlorophyll reflects green wavelengths of light while absorbing blue and red wavelengths

Question 4

During the light-dependent reactions of photosynthesis, what is the primary role of water?

Accepted Answer

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

Question 5

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

Accepted Answer

The products of photosynthesis serve as the reactants for cellular respiration, and vice versa

Question 6

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

Accepted Answer

The rate will decrease because chlorophyll reflects green light rather than absorbing it

Question 7

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

Accepted Answer

Glucose

Question 8

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

Accepted Answer

It catalyzes the fixation of $$CO_2 to $$RuBP (ribulose bisphosphate)

Question 9

Which of the following best explains why stomata close during hot, dry days, and what is a consequence of this action?

Accepted Answer

To prevent water loss through transpiration, but this also limits $$CO_2$$ uptake and slows photosynthesis

Question 10

Which of the following is a correct sequence of events in the light-dependent reactions?

Accepted Answer

Light excites electrons in photosystem II, water is split, electrons move through the electron transport chain, ATP and NADPH are produced

Question 11

A scientist measures the absorption spectrum of a plant pigment and finds peaks at 450 nm and 680 nm. What can be inferred about the pigment's function in photosynthesis?

Accepted Answer

It is likely involved in capturing blue and red light for photosynthesis

Question 12

Which of the following best describes the fate of the $$O_2$$ produced during photosynthesis?

Accepted Answer

It is released as a byproduct from the splitting of water molecules

Question 13

Which of the following is a real-world consequence of the complementary nature of photosynthesis and cellular respiration?

Accepted Answer

Plants provide oxygen and organic molecules for animals, while animals provide $$CO_2$$ for plants

Question 14

Which of the following best explains why biofuels are considered more sustainable than fossil fuels in terms of the carbon cycle?

Accepted Answer

Biofuels recycle $$CO_2$$ recently removed from the atmosphere by plants, while fossil fuels release ancient carbon

Question 15

A mutation disables the ATP synthase enzyme in a plant's chloroplasts. Which process would be directly affected?

Accepted Answer

The production of ATP during the light-dependent reactions

Question 16

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

Accepted Answer

It uses ATP and NADPH to convert $$CO_2$$ into G3P, which can be used to make glucose

Question 17

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 depends on ATP and NADPH from the light-dependent reactions

Question 18

A plant is genetically engineered to lack carotenoids. What is a likely consequence for the plant?

Accepted Answer

It will be more susceptible to damage from excess light energy

Question 19

Which of the following is a multi-step process that occurs during the Calvin cycle?

Accepted Answer

Carbon fixation, reduction, and regeneration of RuBP

Photosynthesis: Light Reactions and the Calvin Cycle

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