Topic 3.5 - Photosynthesis

Which pathway requires the greatest input of energy to make its product?

• Noncyclic electron transport

• Carbon fixation

• Calvin cycle

• Cyclic electron transport

• Photophosphorylation

Which biological group is dependent on photosynthesis for its survival?

• Vertebrates

• Mammals

• Fish

• Plants

• All of the above.

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The first pathway of photosynthesis, in which light energy is converted into chemical energy in the form of ATP and NADPH, is referred to as the

• Light reductions

• Dark reactions

• Carbon-fixation reactions

• Light reactions

• Dark reductions

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NGSS.HS-LS1-5

Which of the following occurs during the carbon-fixation reactions of photosynthesis?

• Water is converted into hydrogen and water.

• CO₂ and water are converted into sugars.

• Chlorophyll acts as an enzyme.

• Nothing occurs; the plant rests in the dark.

• Glucose and oxygen are reduced to CO₂ and water.

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When a suspension of algae is incubated in a flask in the presence of light and CO₂ and then transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is blocked. This reaction stops in the dark because

• the reaction requires CO₂.

• the reaction is exergonic.

• the reaction requires ATP and NADPH.

• the reaction requires O₂.

• chlorophyll is not synthesized in the dark.

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NGSS.HS-LS1-5

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When a photon interacts with molecules such as those within chloroplasts, the photons may

• bounce off the molecules, having no effect.

• pass through the molecules, having no effect.

• be absorbed by the molecules.

• be scattered.

• All of the above

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Compared to long-wavelength photons, short-wavelength photons have

• an insignificant amount of energy.

• more energy.

• energy not available to plant cells.

• a ladder of energy.

• an equal amount of energy.

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How do red and blue light differ from each other?

• They differ in intensity.

• They have a different number of photons in each quantum.

• Their wavelengths are different.

• They differ in duration.

• Red is radiant, whereas blue is electromagnetic.

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NGSS.HS-PS4-1

A molecule that has an absorption spectrum showing maximum absorption within the wavelengths of visible light is

• a reducing agent.

• a quantum.

• a photon.

• electromagnetic radiation.

• a pigment.

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NGSS.HS-LS1-5

The energy difference between an electron excited by a photon and the electron in its ground state is _______ of the photon.

• equal to the energy

• related to the wavelength

• less than the energy

• greater than the energy

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