Transpiration (OCR GCSE Biology A (Gateway Science Suite)): 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?
Through root hair cells by osmosis
Which vessels transport water up the plant?
Which vessels transport water up the plant?
Xylem vessels
Where does water evaporate in leaves?
Where does water evaporate in leaves?
Spongy mesophyll cells
What are the openings where water vapour exits leaves?
What are the 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
Lowers rate (air saturated with moisture)
Effect of low humidity on transpiration
Effect of low humidity on transpiration
Increases rate (dry air encourages evaporation)
Effect of increased wind speed on transpiration
Effect of increased wind speed on transpiration
Increases rate (removes humid air around leaf)
Role of transpiration in nutrient movement
Role of transpiration in nutrient movement
Transports minerals & nutrients from soil to plant parts
How does transpiration cool the plant?
How does transpiration cool the plant?
Water evaporation from leaves removes heat
What is turgor pressure?
What is turgor pressure?
Pressure of cell contents against cell wall
Device used to measure transpiration rate
Device used to measure transpiration rate
Potometer
What creates the transpiration pull?
What creates the transpiration pull?
Negative pressure from water loss at stomata