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Which of the following factors can affect the rate of photosynthesis? (Select all that apply)
Which of the following factors can affect the rate of photosynthesis? (Select all that apply)
- Light intensity (correct)
- Carbon dioxide levels (correct)
- Water (correct)
- Chlorophyll (correct)
- Temperature (correct)
- Oxygen (correct)
How does temperature affect the rate of photosynthesis?
How does temperature affect the rate of photosynthesis?
The rate of photosynthesis increases with temperature until it reaches an optimal level around 35 C, after which it declines.
How does light intensity affect the rate of photosynthesis?
How does light intensity affect the rate of photosynthesis?
The rate of photosynthesis increases with light intensity but will not rise beyond a certain level.
How do carbon dioxide levels affect the rate of photosynthesis?
How do carbon dioxide levels affect the rate of photosynthesis?
What are limiting factors in photosynthesis?
What are limiting factors in photosynthesis?
How can water be a limiting factor in photosynthesis?
How can water be a limiting factor in photosynthesis?
How can oxygen be a limiting factor in photosynthesis?
How can oxygen be a limiting factor in photosynthesis?
How can chlorophyll be a limiting factor in photosynthesis?
How can chlorophyll be a limiting factor in photosynthesis?
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Study Notes
Factors Affecting Photosynthesis
- Factors influencing photosynthesis include temperature, light intensity, carbon dioxide levels, water, oxygen, and chlorophyll.
Temperature's Impact
- Photosynthesis rates rise with temperature until reaching an optimal point, typically around 35°C, after which the rate declines.
Light Intensity's Effect
- Increasing light intensity enhances the rate of photosynthesis, but this increase levels off after reaching a certain threshold.
Carbon Dioxide Levels
- Higher carbon dioxide concentrations boost photosynthesis rates, up to a limiting concentration where increases do not further affect the rate.
Understanding Limiting Factors
- Limiting factors, such as temperature, light, and carbon dioxide levels, operate concurrently, affecting photosynthesis. For instance, increased light intensity can lead to carbon dioxide limitations, causing the rate to plateau.
Role of Water in Photosynthesis
- Plants utilize only a small part of absorbed water for photosynthesis; the majority serves other cellular functions. Hot weather causes stomatal closure, limiting carbon dioxide intake, thus carbon dioxide becomes the limiting factor, not water.
Oxygen's Limiting Factor
- Elevated oxygen levels in leaf cells hinder carbon dioxide conversion in photosynthesis. An excess of oxygen slows reaction rates, hence reducing photosynthesis efficiency when oxygen levels are high.
Chlorophyll's Importance
- Chlorophyll deficiency results in reduced light absorption, directly leading to a lower photosynthesis rate.
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