Exchange Systems in Plants

Question 1

How does CO2 enter leaves?

Answer 1

By diffusion

Question 2

What are water and mineral ions absorbed by?

Answer 2

Roots

Question 3

How is the surface area of the root increased?

Answer 3

By root hairs

Question 4

How is the surface area of the leaf increased?

Answer 4

Flattened shape and by internal air spaces

Question 5

Why do plants have stomata?

Answer 5

To obtain CO2 from the atmosphere and to remove O2 produced in photosynthesis

Question 6

Where do plants mainly lose water vapour from?

Answer 6

Through the stomata, in the leaves

Question 7

What conditions make evaporation more rapid?

Answer 7

Hot, dry, windy conditions

Question 8

How do hot conditions make evaporation more rapid?

Answer 8

Increased temp gives particles more heat energy, so they move faster and evaporate

Question 9

How do windy conditions make evaporation more rapid?

Answer 9

Diffusion occurs faster as water molecules that diffuse move away quickly- creating a high concentration gradient

Question 10

What’s transporation?

Answer 10

The evaporation of water vapour from the surface of a plant- especially the leaves

Question 11

What’s the size of stomata controlled by?

Answer 11

Guard cells