Leaves

Question 1

Cactus leaves have become _ and photosynthesis occurs in stems

Answer 1

Protective spines

Question 2

In peas, some leaves have become tendrils to help plant _

Answer 2

Climb

Question 3

Stem part of leaf that connects to plant called _

Answer 3

Petiole

Question 4

Veins of leaf are made of (2)

Answer 4

Xylem

Phloem

Question 5

Large central vein in leaf called a _

Answer 5

Midrib

Question 6

Leaves are made from several layers of cells, including epidermis, _ layer and spongy _ layer

Answer 6

Palisade

Mesophyll

Question 7

_ covers leafs upper surface

Answer 7

Waterproof waxy cuticle

Question 8

Epidermal cells beneath leaf form protective layer, _ so light passes through them

Answer 8

Transparent

Question 9

Most photosynthesis occurs in _ layer

Answer 9

Palisade

Question 10

_ also photosynthesize

Answer 10

Spongy mesophyll cells

Question 11

Air spaces between cells allow _ to diffuse (2)

Answer 11

O

CO2

Question 12

Palisade layer contains _ shaped cells with many chloroplasts

Answer 12

Column

Question 13

Upper epidermis has no _ so light passes through to palisade cell

Answer 13

Chloroplasts

Question 14

Stomata open during day and closed at _

Answer 14

Night

Question 15

1. Stoma opens: light stimulates guard cells to accumulate _

Answer 15

Potassium ions

Question 16

1. Build up of potassium causes water to enter cells by _

Answer 16

Osmosis

Question 17

2 stoma closes: at night, or when water or heat stressed, plant produces stress hormone _

Answer 17

Abscisic acid

Question 18

1. Abscisic acid binding causes _

Answer 18

Potassium to leave guard cell

Question 19

_ causes stoma to close

Answer 19

Water flowing out by osmosis (potassium out)