transpiration Flashcards
1
Q
define transpiration
A
- the evaporation of water from the leaves of a plant
- consequence of gaseous exchange; occurs when the plant opens the stomata to exchange oxygen and carbon dioxide
2
Q
name the factors that affect the rate of transpiration
A
- light intensity (↑)
- temperature (↑)
- humidity (↓)
- air movement (↑)
- presence of waxy cuticle (prevents)
3
Q
how can we measure transpiration rate
A
- potometer
- plant cutting is placed in a water-filled tube that contains an air bubble
- rate of transpiration is calculated by measuring the movement of the air bubble over time
4
Q
A
