Photosynthesis
Showing posts with label Photosynthesis. Show all posts
Showing posts with label Photosynthesis. Show all posts

Ozone

Ozone





A) formation is promoted by CFCs.
B) protects Earth from UV radiation.
C) is broken down by carbon dioxide.
D) is a source of oxygen for cellular respiration.





Answer: B

Which of the following statements about the greenhouse effect is true?

Which of the following statements about the greenhouse effect is true?




A) The greenhouse effect will decrease the average temperature of the planet.
B) The greenhouse effect is reduced by deforestation.
C) The greenhouse effect has no direct relationship with the Industrial Revolution of the 1800s.
D) The greenhouse effect is exacerbated by the use of fossil fuels.






Answer: D

Global warming due to the greenhouse effect may be

Global warming due to the greenhouse effect may be




A) made worse by photosynthesis, which adds carbon dioxide to the atmosphere.
B) moderated by photosynthesis, which removes carbon dioxide from the atmosphere.
C) of little concern, since it is part of the normal cycle for the planet.
D) reduced by the burning of fossil fuels, which removes oxygen from the atmosphere.






Answer: B

Plant cells

Plant cells




A) lack mitochondria and chloroplasts.
B) have mitochondria and chloroplasts.
C) have mitochondria but do not have chloroplasts.
D) lack mitochondria but have chloroplasts.






Answer: B

Plants use sugars as

Plants use sugars as



A) a fuel for photosynthesis.
B) a fuel for cellular respiration and a starting material for making other organic molecules.
C) a source of electrons for chemiosmosis.
D) a starting material for the Calvin cycle.







Answer: B

The process of photosynthesis arose roughly two billion years ago. Its origin had a huge impact on existing organisms and on the physical characteristics of the biosphere. Which major physical change could be attributed to photosynthesis?

The process of photosynthesis arose roughly two billion years ago. Its origin had a huge impact on existing organisms and on the physical characteristics of the biosphere. Which major physical change could be attributed to photosynthesis?





A) Photosynthesis allowed much higher levels of ultraviolet light to reach Earth's surface.
B) Photosynthesis drastically raised Earth's surface temperature.
C) Photosynthesis drastically increased the oxygen content of the atmosphere.
D) Photosynthesis drastically increased the carbon dioxide content of the atmosphere.






Answer: C

ATP and NADPH

ATP and NADPH




A) power sugar synthesis during the Calvin cycle.
B) are used in the electron transport chain to pump H+ into the thylakoid space.
C) provide energy to Photosystem I and Photosystem II.
D) are products of the Calvin cycle.







Answer: A

Why are most plants green?

Why are most plants green?



A) Green helps plants blend into their environment as a sort of camouflage.
B) Chlorophyll a reflects green light.
C) Chlorophyll b primarily uses green light as the source of energy for photosynthesis.
D) Chlorophyll a absorbs green light.








Answer: B

Which of the following statements regarding photosynthesis is false?

Which of the following statements regarding photosynthesis is false?



A) Photosynthesis produces O2; respiration produces CO2.
B) Photosynthesis is ultimately powered by light energy and respiration by the chemical energy of fuel molecules.
C) Photosynthesis consumes CO2; respiration consumes O2.
D) ATP is not produced during photosynthesis, but only during cellular respiration.







Answer: D
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