3.4: Leaves

Question 1

• first embryonic leaves
• storage organ
• give a lot into leaves during germination

Answer 1

cotyledon

Question 2

leaves shout be…

Answer 2

flat & thin ; alive & differentiated

Question 3

simple leaf originate from single point

Answer 3

palmately lobed

Question 4

simple leaf originate from midrib at separate points

Answer 4

pinnately lobed

Question 5

compound leaf: leaflets attached to single point in petiole

Answer 5

palmately compound

Question 6

compound leaf: leaflets attached to rachis

Answer 6

pinnately compound

Question 7

venation common in angiosperms
- pinnately
- anastomosing (everywhere)

Answer 7

netted/reticulate venation

Question 8

venation common in monocots
- side to side
- base to tip

Answer 8

parallel venation

Question 9

in ferns: the first set of veins in each pinna or lobe points towards the apex

Answer 9

anadromous

Question 10

in ferns: the first set of veins in a pinna in a basal direction

Answer 10

catadromous

Question 11

lack of petiole replace by…

Answer 11

leaf sheath

Question 12

w petiole

Answer 12

petiolatew

Question 13

w/o petiole

Answer 13

sessile

Question 14

w/ stipule

Answer 14

stipulate

Question 15

w/o stipule

Answer 15

exstipulate

Question 16

orientation of leaves in space

Answer 16

phyllotaxy

Question 17

cluster of similar organs from same point

Answer 17

fascicled

Question 18

two different planes

Answer 18

decussate

Question 19

same plane

Answer 19

distichous

Question 20

what makes leaf waterproof?

Answer 20

cutin

Question 21

• 1 or more layers of elongated chloranchyma
• specialized in light absorption
• closely packed

Answer 21

palisade mesophyll

Question 22

• several layers of irregularly-shaped parenchyma
  -surrounds vascular bundles

Answer 22

spongy mesophyll

Question 23

• collenchyma cells for support
• protection of vascular tissues

Answer 23

bundle sheath

Question 24

• mass of fibers above/below
• in large veins for additional support

Answer 24

bundle sheath extension

Question 25

for support: - slender coiling structure - derived from branch

Answer 25

leaf tendril

Question 26

for support: - tip into tendril - sense objects; grow around them

Answer 26

apex tendril

Question 27

for support: compact assemblage of overlapping and spirally arranged leaf sheaths

Answer 27

pseudostem

Question 28

for storage: - thick/fleshy - favors water conservation

Answer 28

succulents/ thickened leaves

Question 29

for storage: - large epiphytic ferns trap organic debris - becomes canopy soil= can store water externally

Answer 29

pocket/nest leaves

Question 30

for protection: - red conical structure - revealed as leaf starts to lengthen

Answer 30

united stipules

Question 31

for protection: - swelling on petiole - permits leaf movement

Answer 31

pulvinus

Question 32

for attraction: modified/specialized leaf in the inflorescence, standing below partial peduncles, pedicels, or flowers

Answer 32

colored bracts

Question 33

for reproduction: mitosis at meristems along the leaf margins produce tiny plantlets that fall of and grow independently into mature plants

Answer 33

marginal notches

Question 34

for buoyancy: bulbous stalks that contain air-filled tissues

Answer 34

bulbose petiole

Question 35

for traps: - lamina is tubular rather than flat - secretes digestive fluid

Answer 35

pitcher-like apex