Transpiration (AQA GCSE Biology Combined Science): Flashcards
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What is transpiration?
What is transpiration?
Water moves from roots to leaves, then evaporates into air
What is the transpiration stream?
What is the transpiration stream?
Continuous flow of water through a plant
How do root hair cells absorb water?
How do root hair cells absorb water?
By osmosis
What is xylem?
What is xylem?
Special tubes that carry water up through the stem
What are stomata?
What are stomata?
Tiny openings in leaves where water vapour escapes
What do guard cells do?
What do guard cells do?
Control opening and closing of stomata
What happens when guard cells take in water?
What happens when guard cells take in water?
Become swollen and curved, opening the stoma
What happens when guard cells lose water?
What happens when guard cells lose water?
Become limp and straight, closing the stoma
Where are most stomata located?
Where are most stomata located?
On the lower/bottom surface of leaves
Why are stomata on the bottom of leaves?
Why are stomata on the bottom of leaves?
Less sunlight hits bottom, reducing water loss