$$6CO_2 + 6H_2O + \text{Light energy} \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 1

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

Accepted Answer

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

Question 2

Which statement correctly distinguishes autotrophs from heterotrophs?

Accepted Answer

Autotrophs synthesize organic compounds from inorganic sources, while heterotrophs must obtain organic compounds from other organisms.

Question 3

During the light-capturing reactions of photosynthesis, which molecule acts as the final electron acceptor?

Accepted Answer

NADP$$^+$$

Question 4

Which of the following best explains why plants appear green?

Accepted Answer

Chlorophyll absorbs red and blue wavelengths and reflects green wavelengths.

Question 5

If a plant is exposed only to light with a wavelength of 750 nm, what is the most likely outcome for its photosynthetic rate?

Accepted Answer

Photosynthetic rate will decrease because 750 nm is outside the visible spectrum absorbed by chlorophyll.

Question 6

Which pigment is primarily responsible for the absorption of light energy during photosynthesis?

Accepted Answer

Chlorophyll a

Question 7

What is the function of carotenoids in plant cells?

Accepted Answer

They protect chlorophyll from damage by quenching free radicals.

Question 8

Which of the following best describes the role of the Calvin cycle in photosynthesis?

Accepted Answer

It uses ATP and NADPH to reduce CO$$_2 to $$sugar.

Question 9

A scientist uses chromatography to separate pigments from a leaf. Which pigment would likely appear as the most abundant green band?

Accepted Answer

Chlorophyll a

Question 10

Which statement about the electromagnetic spectrum is correct?

Accepted Answer

Visible light ranges from about 400 nm to 710 nm in wavelength.

Question 11

What is the primary function of the thylakoid membrane in chloroplasts?

Accepted Answer

It houses the light-capturing reactions of photosynthesis.

Question 12

Which process directly results in the release of oxygen gas during photosynthesis?

Accepted Answer

Splitting of water molecules in photosystem II

Question 13

Which of the following is a correct description of a photon?

Accepted Answer

A discrete packet of light energy

Question 14

If a plant is placed in an environment with no CO$$_2$$, which part of photosynthesis will be directly affected?

Accepted Answer

The Calvin cycle will stop because it requires CO$$_2 as a $$substrate.

Question 15

Which of the following best explains the relationship between wavelength and energy in the electromagnetic spectrum?

Accepted Answer

Shorter wavelengths have higher energy.

Question 16

Which molecule is oxidized and reduced during the light-dependent reactions of photosynthesis?

Accepted Answer

Nicotinamide adenine dinucleotide phosphate (NADP$$^+)$$

Question 17

A mutation prevents the formation of the light-harvesting complex in a plant. What is the most likely consequence?

Accepted Answer

The plant will be unable to efficiently capture and transfer light energy to the reaction center.

Question 18

Which of the following is true about the absorption spectrum of chlorophyll?

Accepted Answer

It shows strong absorption in the red and blue regions of visible light.

Question 19

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

Accepted Answer

A phosphorylated three-carbon sugar

Question 20

Which process is responsible for transferring energy from an excited electron in a pigment to an adjacent pigment molecule?

Accepted Answer

Resonance energy transfer

Photosynthesis: Mechanisms, Pigments, and Energy Capture

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