transpiration

Question 1

What is transpiration?

Answer 1

The evaporation of water from a plant’s surface

Question 2

How does the water leave the plant?

Answer 2

Through the stomata

Question 3

What does the stomata allow to happen when they’re open?

Answer 3

Entry of carbon dioxide by photosynthesis

Question 4

What are the environmental factors affecting the rate of transpiration?

Answer 4

Light, temperature, humidity and air movement

Question 5

How does light affect the rate of transpiration?

Answer 5

During daylight, stomata open to allow carbon dioxide to enter which allows the water to evaporate and diffuse out the leaf

Question 6

How does temperature affect the rate of transpiration?

Answer 6

Increase in temperature provides the water molecules with more kinetic energy allowing them to evaporate more easily

Question 7

What is humidity?

Answer 7

Refers to the water vapour content of the air surrounding the plant

Question 8

How does humidity affect the rate of transpiration?

Answer 8

Increase in humidity decreases rate of transpiration as it increases the water potential of the air so water potential gradient for diffusion decreases

Question 9

How does air movement affect the rate of transpiration?

Answer 9

Removes water vapour from the leaf surface increasing the water potential gradient