tissues and organs in plants

Question 1

upper epidermis

Answer 1

one cell thick, covers leaf like a skin. waxy cuticle.

Question 2

(upper epidermis) waxy cuticle

Answer 2

protects leaf against disease. waterproof, prevents water loss by evaporation.

Question 3

palisade mesophyll layer

Answer 3

helps light to penetrate into leaf. more chloroplasts than other cells in leaf. chlorophyll in chloroplasts. chloroplasts can move to other regions where light intensity is greatest

Question 4

spongy mesophyll layer

Answer 4

gaps allow gas exchange. fewer chloroplasts than is palisade cells as less light intensity

Question 5

lower epidermis

Answer 5

(like upper epidermis, but has stomata and guard cells)

Question 6

(lower epidermis) guard cells

Answer 6

guard stomata.

Question 7

(lower epidermis –> guard cells) stomata

Answer 7

opens and closes 4 gas exchange