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Questions and Answers
What is the maximum concentration of carbon dioxide that can be increased in the atmosphere?
What is the maximum concentration of carbon dioxide that can be increased in the atmosphere?
- 0.2%
- 0.05% (correct)
- 0.01%
- 0.1%
How do C3 plants respond to high CO2 levels?
How do C3 plants respond to high CO2 levels?
- They show an increase in photosynthesis (correct)
- They show a decrease in photosynthesis
- They remain unaffected
- They show an increase in respiration
What is the purpose of increasing CO2 levels in greenhouse crops?
What is the purpose of increasing CO2 levels in greenhouse crops?
- To reduce yields
- To increase yields (correct)
- To improve the quality of the crops
- To reduce the amount of light
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Study Notes
- The concentration of carbon dioxide in the atmosphere is very low, and can only be increased up to 0.05%.
- At low light conditions, C3 plants do not respond to high CO2 levels, but at high light intensities, they show an increase in photosynthesis.
- The availability of CO2 levels is limiting to C3 plants, as they only respond to increased levels.
- This increase in photosynthesis is used to increase yields in greenhouse crops, such as tomatoes and bell pepper, which are grown in a CO2 enriched atmosphere.
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