TRANSPIRATION
MOVEMENT
KEY CONCEPT: CHANGE
GLOBAL CONTEXT: FAIRNESS AND DEVELOPMENT
Goals:
 define transpiration, adhesion, cohesion
 explain the role of xylem and stomata
 list the factors and explain how they can affect the rate of transpiration
 state the name of device which is used to measure the transpiration rate
 describe the structure of potometer
 outline how potometer works
 outline precautions on which you have to focus when you set up the experiment with
potometer
 explain how to calculate the rate of transpiration
TRANSPIRATION
Watch the movie and read information from websites, then answer questions below
https://www.youtube.com/watch?v=mc9gUm1mMzc
https://biology-igcse.weebly.com/transpiration-in-plants-and-factors-affecting-tranpirationrate.html
https://www.biology-pages.info/T/Transpiration.html
a) Define transpiration.
b) Explain what is a cohesion.
c) Explain what is an adhesion.
d) State the name of tissue used for water transport in plant.
e) Name the structures through which water is removed from leaves.
f) List factors which can affect transpiration rate.
g) Explain how plant prevents excessive water loss.
POTOMETER
Transpiration can be measured by an instrument called a potometer.
Read the information and watch the movie, then answer questions below.
http://www.passmyexams.co.uk/GCSE/biology/measuring-transpiration.html
https://www.youtube.com/watch?v=HfeRBh-Hxlk
List precautions.
Explain whether in your opinion the method with the use of the potometer is direct or indirect
way to measure the rate of transpiration.
Explain how you can calculate the rate of transpiration.
Suggest what you can use to investigate how following factors affect the rate of transpiration:
a) light
b) temperature
c) humidity
d) wind speed
As a revision answer questions within the interactive worksheet (link below)
https://www.liveworksheets.com/yv380819qv