Transpiration
This practical lesson covers:
- The role of environmental factors in determining the rate of transpiration from a leafy shoot.
Investigating the rate of transpiration
Aim:
To investigate the role of environmental factors (temperature, humidity, wind speed, light intensity) in determining the rate of transpiration from a leafy shoot.
Background information:
Transpiration is the process by which plants lose water vapour primarily from their leaves, playing a crucial role in nutrient uptake and temperature regulation. In this practical, you will use a potometer to measure how various environmental factors, such as temperature, humidity, wind speed, and light intensity, affect transpiration rates in a leafy shoot. By observing these influences, you will gain insights into how plants manage water loss and maintain physiological balance under different conditions.
Variables:
- Independent variable - Environmental factor such as temperature, humidity, wind speed, light intensity
- Dependent variable - Rate of transpiration
- Control variables - Type of plant used, size of leafy shoot, initial volume in potometer
What is the role of environmental factors in determining the rate of transpiration from a leafy shoot?
they have no role
they can stop transpiration
they can influence the rate of transpiration
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What is the purpose of using vaseline in the potometer?
to make it watertight
to make it airtight
to make it look nice
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What is the purpose of the fan in this experiment?
to simulate wind speed
to dry the leafy shoot
to keep the experimenter cool
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