6.2 Leaves

Question 1

vascular bundles

Answer 1

collections of xylem tubes and phloem vessels running side, which form the veins in a leaf

Question 2

epidermis

Answer 2

the outer layer of tissue on a plant: also the outer layer of an animal’s skin

Question 3

secrete

Answer 3

make a useful substance and then send it out of the cell where it is made to be used in another part of the body

Question 4

cuticle

Answer 4

A thin layer of wax that covers the upper surface of a leaf

Question 5

palisade mesophyll

Answer 5

the layer of cells immediately beneath the upper epidermis, where most photosynthesis happens

Question 6

spongy mesophyll

Answer 6

the layer of cells immediately beneath the palisade mesophyll, where some photosynthesis happens; this tissue contains a lot of air spaces between the cell

Question 7

stomata (singular: stoma)

Answer 7

openings in the surface of a leaf, most commonly in the lower surface; they are surrounded by pairs of guard cells, which control whether the stomata are open or closed

Question 8

guard cells

Answer 8

a pair of cells that surrounds a stoma and controls its opening; guard cells are the only cells in the epidermis that contain chloroplasts