Transpiration

Question 1

What is transpiration

Answer 1

The loss of water vapour from the plant leaves.

Question 2

How does transpiration occur

Answer 2

Water absorbed by roots

Water moves up through the xylem (plant pipe)

Water reaches the leaves

It evaporates from the spongy mesophyll cells inside the leaf

Then it diffuses out through the stomata as water vapour

Question 3

Why is transpiration important

Answer 3

Cools the plant
Transports minerals
Keeps water movings
Maintains water flow Continuous movement keeps cells turgid (firm)

Question 4

What factors affect transpiration

Answer 4

Light
Temperature
Wind
Humidity
Stomatal opening

Question 5

What s the transpiration stream

Answer 5

roots → stem → leaves → out the stomata

Question 6

How is water pulled up

Answer 6

Capillary action

Cohesion (water sticking to water)

Adhesion (water sticking to xylem walls)

Suction force created by evaporation at leaves

Question 7

How is transpiration measured

Answer 7

Potometer