10BD 8-4: Variations of Photosynthesis

What are the basic reactants required for photosynthesis?

• Oxygen, water, and light

• Carbon dioxide, water, and light

• Nitrogen, water, and light

• Carbon dioxide, oxygen, and light

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which part of the plant is primarily responsible for gas exchange during photosynthesis?

• Roots

• Stomata

• Stem

• Flowers

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NGSS.MS-LS1-6

How does temperature affect the rate of photosynthesis?

• It has no effect

• Cold temperatures speed up photosynthesis

• High temperatures always increase photosynthesis

• Optimal temperatures increase the rate, but extreme temperatures can slow or stop it

Explain why C4 plants are more efficient in hot climates compared to C3 plants.

• They use less water

• They can fix carbon dioxide at lower concentrations

• They have a different photosynthetic pathway that reduces photorespiration

• They grow faster

What is the role of RuBisCo in the Calvin cycle?

• It absorbs light energy

• It catalyzes the fixation of carbon dioxide

• It transports water

• It releases oxygen

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NGSS.HS-LS2-5

Describe how CAM plants adapt to arid environments.

• They open their stomata during the day

• They store carbon dioxide as a 4-carbon compound at night

• They use more water than other plants

• They do not perform photosynthesis

What happens to the rate of photosynthesis when light intensity increases beyond a certain point?

• It continues to increase indefinitely

• It decreases

• It remains constant

• It reaches a maximum rate and then levels off

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NGSS.HS-LS1-5

Why might increasing atmospheric carbon dioxide not always lead to increased plant growth?

• Plants do not need carbon dioxide

• Other resources like nitrogen may become limiting

• High carbon dioxide levels are toxic

• Plants will stop photosynthesizing

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NGSS.HS-LS2-5

NGSS.HS-LS2-2

How do high temperatures affect the photosystems and enzymes involved in photosynthesis?

• They enhance their function

• They have no effect

• They can damage them

• They make them more efficient

What is photorespiration and why is it considered wasteful?

• It is the process of releasing oxygen, and it uses up energy without producing sugar

• It is the process of absorbing carbon dioxide, and it produces sugar

• It is the process of releasing water, and it uses up energy without producing sugar

• It is the process of absorbing oxygen, and it produces sugar