Transpiration Flashcards
1
Q
Define transpiration
A
Exhalation of water vapour through stomata
2
Q
What do guard cells do?
A
Control opening and closing of stomata
3
Q
What happens to stomata width
A
Width increase closer to midday and decreases at midnight
4
Q
Why does stomata close at night?
A
Protection during the night - no need to be open when it can’t photosynthesise
5
Q
Conditions that increase transpiration rate
A
*Increase in light
*Increase in Temperature
*Windy
6
Q
Condition that decreases Transpiration
A
Humid
7
Q
Why does wind increase transpiration
A
Wind blows away saturated air
More water vapour diffuses
8
Q
Why does light increase transpiration
A
Stomata opens for gaseous exchange
More water vapour evaporates out
