Transpiration (AQA GCSE Biology Combined Science): Flashcards
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What is transpiration?
What is transpiration?
Water absorbed by roots, travels up plant, evaporates from leaves
How does water enter plant roots?
How does water enter plant roots?
By osmosis through root hair cells
Which vessels transport water upwards?
Which vessels transport water upwards?
Xylem vessels
Openings where water vapour exits leaves?
Openings where water vapour exits leaves?
Stomata
Effect of increased light on transpiration?
Effect of increased light on transpiration?
Increases rate (stomata open wider)
Effect of higher temperature on transpiration?
Effect of higher temperature on transpiration?
Increases rate (faster evaporation)
Effect of high humidity on transpiration?
Effect of high humidity on transpiration?
Decreases rate (reduced concentration gradient)
Effect of increased wind speed on transpiration?
Effect of increased wind speed on transpiration?
Increases rate (removes humid air)
What is turgor pressure?
What is turgor pressure?
Pressure of cell contents against cell wall
What does a potometer measure?
What does a potometer measure?
Rate of transpiration/water uptake