Marram Grass

Question 1

Sand dunes are another example of a dry environment where plants have evolved to survive Marram grass is commonly found on these sand dunes

Their leaves are well adapted to minimise water loss:

Leaves can roll up to reduce

Answer 1

the exposure of surfaces to the wind

Question 2

The rolling of the leaf provides deep grooves which protect the

Answer 2

The rolling of the leaf provides deep grooves which protect the stomata alsdo traps still air which becomes saturated vapour increases water potential

Question 3

The exposed surface has no …………. and a thick ……..

Answer 3

stomata

thick cuticle

Question 4

The inner surface of the leaf possesses a large number of

Answer 4

hairs which trap moisture lowering water potential gradient

Question 5

Image showing how the adaptations of the leaf causes water vapour to be trapped and retained near the stomata.

This humid air near the stomata means the water potential gradient out of the leaf is reduced, so the rate of evaporation

Answer 5

decreases

Question 6

What does a vascular bundle do in plants

Answer 6

distribute water and organic substances around the plant and serve as structural support.

xylem and phloem

Question 7

Hinge cells shrink due to dehydration which pulls

Answer 7

sides of grooves together

Question 8

Most plants have a fail-safe mechanism to balance gas exchange with water loss. If the guard cells that open the stomata lose water and become flaccid due to dehydration then the stomata close and no more water can be lost through them.