Gas Exchange And Plants

Question 1

Describe the structure of a dicotyledonous leaf ?

Answer 1

Waxy cuticle ->upper epidermis ->paliside ->spongy mesophyll->vein -> lower epidermis .Stomata and guard cell

Question 2

Where does gas exchange occur in a leaf ?

Answer 2

Stomata

Question 3

What is a xerophytic plant?

Answer 3

A plant which lives in an environment where water is limited and has adaptions for this

Question 4

Give examples of adaptions of xerophytic plants ? (5)

Answer 4

Curled leaves trap moisture to increase local humidity
Hairs to trap moisture to increase local humidity
Sunken stoma traps moisture to increase local humidity
Thicker cuticle to reduce evaporation
Longer root network to reach more water

Question 5

How do plants reduce water loss by evaporation ?

Answer 5

stomata close at night when photosynthesis shouldn’t be happening