Transpiration (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards
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What is transpiration?
What is transpiration?
Water absorbed by roots, travels up plant, evaporates from leaves
Where does water enter the plant?
Where does water enter the plant?
Root hair cells
How does water enter root hair cells?
How does water enter root hair cells?
Osmosis
Which vessels transport water up the plant?
Which vessels transport water up the plant?
Xylem vessels
Openings where water vapour exits leaf
Openings where water vapour exits leaf
Stomata
Where does water evaporate in leaves?
Where does water evaporate in leaves?
Spongy mesophyll cells
Effect of increased light on transpiration
Effect of increased light on transpiration
Higher 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 increased wind on transpiration
Effect of increased wind on transpiration
Increases rate (removes humid air around leaf)
Plant response to water scarcity
Plant response to water scarcity
Closes stomata to conserve water
Transpiration role in nutrient transport
Transpiration role in nutrient transport
Transports minerals & nutrients from soil through plant
How does transpiration cool the plant?
How does transpiration cool the plant?
Water evaporation from leaves removes heat
What device measures transpiration rate?
What device measures transpiration rate?
Potometer
What creates negative pressure in leaf?
What creates negative pressure in leaf?
Water vapour loss from stomata