Question detail
What role does photosynthesis play in regulating carbon dioxide levels?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Carbon dioxide and methane as greenhouse gases
Question
- A. It increases carbon dioxide levels.
- B. It has no effect on carbon dioxide levels.
- C. It decreases carbon dioxide levels by converting it into glucose.
- D. It only affects oxygen levels.
Answer
The correct option is It decreases carbon dioxide levels by converting it into glucose.. This answer is correct because it matches the approved learning objective to explain that deforestation increases carbon dioxide by reducing photosynthesis and by burning or decomposing biomass in the subtopic Human activities which contribute to an increase in greenhouse gases in the atmosphere.
Explanation
The correct option is It decreases carbon dioxide levels by converting it into glucose.. It decreases carbon dioxide levels by converting it into glucose. is correct because it directly supports the approved learning objective to explain that deforestation increases carbon dioxide by reducing photosynthesis and by burning or decomposing biomass. This belongs to the subtopic Human activities which contribute to an increase in greenhouse gases in the atmosphere within Carbon dioxide and methane as greenhouse gases, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Human activities which contribute to an increase in greenhouse gases in the atmosphere.
Common mistake
Deforestation and Carbon Dioxide
Students often state that deforestation only increases carbon dioxide by burning trees, neglecting the role of reduced photosynthesis.
Emphasize that deforestation increases carbon dioxide both by burning trees and by reducing the number of trees available for photosynthesis, which absorbs carbon dioxide.
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