Transpiration (Edexcel 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
Where does water enter the plant?
Where does water enter the plant?
Root hair cells (by osmosis from soil)
What do xylem vessels do?
What do xylem vessels do?
Transport water from roots to leaves
What is the role of stomata in transpiration?
What is the role of stomata in transpiration?
Openings where water vapour diffuses out of leaf
How does increased light affect transpiration?
How does increased light affect transpiration?
Increases rate (stomata open wider)
How does higher temperature affect transpiration?
How does higher temperature affect transpiration?
Increases rate (water evaporates faster)
How does high humidity affect transpiration?
How does high humidity affect transpiration?
Decreases rate (reduces concentration gradient)
How does increased wind affect transpiration?
How does increased wind affect transpiration?
Increases rate (removes humid air)
How does transpiration cool the plant?
How does transpiration cool the plant?
Water evaporation cools plant, prevents overheating
What device measures transpiration rate?
What device measures transpiration rate?
Potometer (measures water uptake via air bubble movement)