Leaf Structure And Function

Question 1

Waxy cuticle

Answer 1

Reduces water loss by evaporation. Barrier to microbes.

Question 2

Upper epidermis

Answer 2

Relatively transparent. Contains few or no stoma.

Question 3

Stomata

Answer 3

Pores which allow diffusion of gases in and out of leaf.

Question 4

Guard cells

Answer 4

Alter their shape to pen or close the stoma

Question 5

Palisade layers

Answer 5

Contains many chloroplasts (absorb light). Main site of photosynthesis

Question 6

Spongy layer

Answer 6

The main gas exchange surface of the leaf

Question 7

Phloem

Answer 7

Tubes which carry sugars away from the leaf.

Question 8

Xylem

Answer 8

Tubes which transport water and minerals to the leaf