stomata

Question 1

Guard cells open the stomata when they are

and close when

Answer 1

Guard cells open the stomata when they are turgid and

close the stomata when they lose water flaccid

Question 2

Transpiration is mainly controlled by the pairs …….. cells surrounding stomata

Answer 2

guard

Question 3

When the stomata are open there is a greater rate of

Answer 3

transpiration and of gaseous exchange

Question 4

As stomata allow gaseous exchange (CO2 in and O2 out) they are generally open during the

Answer 4

day

Question 5

Remember that water evaporates from the ……………………

Transpiration and the transpiration stream are different:

Transpiration is the loss of water vapour from the leaves or stem

Whereas the transpiration stream is the movement of water through the xylem tissue and mesophyll cells.

Answer 5

mesophyll cells into the air spaces in the leaf and then water vapour diffuses through the stomata.