Kathleen Beh
30/3/2022
Name: ___________________
Date: ____________________
Biology Lab Experiment: Observing Transpiration with a Potometer
Factor Involved: Temperature
How does temperature affect the rate of transpiration?
Claim
The higher the temperature, the higher the rate of transpiration
Evidence
When the plant was placed in an environment of high temperature, the distance moved by
water per cm cube was the greatest.
Reasoning
Because at higher temperatures, the rate of evaporation of water at the surface of leaves is
greater. Therefore, more water is lost from the leaves as it diffuses out of the stomata.
Definition of transpiration: The loss of water vapour from the leaves of a plant as a result
of evaporation of water from cell surfaces inside the leaf, and then its diffusion down a
concentration gradient out of the stomata.
Water is transpired out of the surface of leaves by the transpiration-al pull. Loss of water
needs to be replaced so water move up. When one water molecule moves up, the other
water molecules move up as well because of cohesion of water.
Therefore, this results in an increase of water uptake due to the increase of transpiration in
the plant.