BI-2100
Factors affecting transpiration
Biology · Secondary 4 · Hard · Factors affecting transpiration
In an investigation, students measured the rate of transpiration of a plant at different temperatures. They found that the rate increased from 20 °C to 30 °C, but decreased when the temperature was raised further to 40 °C. Which statement best explains this pattern?
- Evaporation of water from leaves is slowest at 30 °C.
- Stomata are fully closed between 20 °C and 30 °C.
- Evaporation increases up to 30 °C, but at 40 °C stomata start to close, reducing water loss.
- Root hairs absorb less water as temperature increases from 20 °C to 40 °C.
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