Chapter 4. 4·5–4·11 Photosynthesis uses energy from sunlight to make food.

Show What You Know - Self Quiz

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 4·5–4·11 Photosynthesis uses energy from sunlight to make food by answering the following questions.

1.

1. A plant whose leaves are reddish yellow is NOT absorbing light from which wavelengths of the visible light spectrum?

blue and violet

green and yellow

red and yellow

green, blue, and violet

blue, green, and red

Correct! (See section 4·7 Light energy travels in waves: plant pigments absorb specific wavelengths.)

Incorrect. (See section 4·7 Light energy travels in waves: plant pigments absorb specific wavelengths.)

2.

2. What is the source of the electrons that replace those lost by chlorophyll a in the photosystems?

carotenoids

water

chlorophyll b

carbon dioxide

oxygen gas

Correct! (See section 4·9 Photosynthesis in detail: the energy of sunlight is captured as chemical energy.)

Incorrect. (See section 4·9 Photosynthesis in detail: the energy of sunlight is captured as chemical energy.)

3.

3. Which of the following statements most accurately depicts the relationship between the light reactions and the Calvin cycle in photosynthesis?

The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides the light reactions with water to split.

The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the Calvin cycle provides water and electrons to the light reactions.

There is no relationship between the light reactions and the Calvin cycle.

The light reactions provide ATP and NADPH to the Calvin cycle and the Calvin cycle returns ADP, NADP⁺, and a phosphate group to the light reactions.

The light reactions supply the Calvin cycle with CO₂ to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.

Correct! (See section 4·10 Photosynthesis in detail: the captured energy of sunlight is used to make food.)

Incorrect. (See section 4·10 Photosynthesis in detail: the captured energy of sunlight is used to make food.)

4.

4. During photosynthesis, which step is most responsible for a plant’s acquisition of new organic material:

the “plucking” of carbon molecules from the air and affixing of them to organic molecules within the chloroplast.

the loss of water through evaporation.

the production of ATP during the “light reactions.”

the “building” of NADPH during the Calvin cycle.

the excitation of chlorophyll molecules by photons of light.

Correct! (See section 4·5 Where does plant matter come from? Photosynthesis: the big picture.)

Incorrect. (See section 4·5 Where does plant matter come from? Photosynthesis: the big picture.)

5.

5. A molecule of chlorophyll increases in potential energy:

when one of its electrons is boosted to a higher-energy excited state upon being struck by a photon of light.

when it loses an electron.

when it binds to a photon.

only in the presence of oxygen.

None of the above; the potential energy of a molecule cannot change.

Correct! (See section 4·8 Photons cause electrons in chlorophyll to enter an excited state.)

Incorrect. (See section 4·8 Photons cause electrons in chlorophyll to enter an excited state.)

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