3. Why Transpiration?
Transpiration is a very important process
as it allows plants to absorb more water
from its roots receiving important nutrients
and minerals. Evaporation of water takes
place so as to make the flow of water
constant. Thus, cooling the plant down.
4. Factors affecting transpiration
Light
Humidity-the amount of water vapour in
the surrounding atmosphere
Temperature
Wind
Leaf surface area
5. Transpirational pull
Transpirational pull is the pulling force
developed inside xylem tissue causing the
water to move up the xylem vessel by the
loss of water vapour in the leaves