Topic 6 - Rate Calculations For Transpiration

Question 1

What does measuring the uptake of water by a plant indicate?

Answer 1

The rate of transpiration

Water is only taken up if water leaves the plant

Question 2

What instrument is used to measure transpiration rates?

Answer 2

Potometer

A potometer involves placing a plant in a capillary tube in water

Question 3

How is the rate of transpiration observed using a potometer?

Answer 3

By measuring the distance travelled by a bubble in a capillary tube

The bubble movement indicates water uptake

Question 4

What is placed in one end of the potometer to measure transpiration?

Answer 4

A leaf shoot

This allows for the measurement of bubble travel in the capillary tube

Question 5

What is measured to determine the rate of transpiration?

Answer 5

The distance the bubble travels in a set time

For example, measuring in 1 minute

Question 6

The further the bubble moves in the potometer, the _______ the rate of transpiration.

Answer 6

greater

Greater bubble movement indicates greater water uptake