Multiple Choice
Why do some plants in the tundra retain their dead leaves instead of shedding them?
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9. Photosynthesis
Introduction to Photosynthesis
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which two processes reduce the amount of carbon dioxide ($\mathrm{CO_2}$) in the atmosphere?
A
Respiration and combustion
B
Decomposition and volcanic activity
C
Photosynthesis and fossil fuel burning
D
Photosynthesis and ocean absorption
Verified step by step guidance1
Understand the role of carbon dioxide ($\mathrm{CO_2}$) in the atmosphere and identify processes that either add or remove $\mathrm{CO_2}$.
Recall that photosynthesis is a biological process where plants, algae, and some bacteria use sunlight to convert $\mathrm{CO_2}$ and water into glucose and oxygen. This process reduces atmospheric $\mathrm{CO_2}$.
Learn that ocean absorption refers to the process where $\mathrm{CO_2}$ dissolves into seawater. Oceans act as a carbon sink, reducing the amount of $\mathrm{CO_2}$ in the atmosphere.
Contrast these processes with respiration, combustion, decomposition, and volcanic activity, which release $\mathrm{CO_2}$ into the atmosphere rather than reducing it.
Conclude that photosynthesis and ocean absorption are the two processes that effectively reduce atmospheric $\mathrm{CO_2}$ levels.
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