Investigating Transpiration 2 Flashcards
1
Q
Why must shoot be cut underwater?
A
To prevent air entering xylem so water column remains unbroken
2
Q
Why should the shoot be cut at an angle?
A
To increase surface area available to uptake water
3
Q
How do you keep apparatus airtight & watertight?
A
Place vaseline around joints
4
Q
What are some control variables when investigating transpiration?
A
If using different plants, surface area should be measured as it can vary.
Leaves must be dry & plant allowed to start transpiring before experiment is started
5
Q
What measurements should you take to calculate rate of water uptake?
A
Distance & time
Diameter of capillary tube
6
Q
Why might water uptake not be equal to rate of transpiration?
A
Water used in photosynthesis
Water produced in respiration
