Leaf Gross Anatomy

Question 1

leaves evolved as

Answer 1

photosynthetic organs

Question 2

leaf cells are arranged

Answer 2

to maximize uptake in different situations (high or low light)

Question 3

leaf vascular arrangement and overall form are often based on

Answer 3

phylogeny

Question 4

leaves maximize

Answer 4

photosynthesis

Question 5

leaf size increases as

Answer 5

CO2 concentration decreases

Question 6

3 types of leaf venation

Answer 6

dichotomous
net
parallel

Question 7

dichotomous branched venation =

Answer 7

bundles “split”

Question 8

Earliest branched leaf venation

Answer 8

dichotomous branched venation

Question 9

who has dichotomous branched venation

Answer 9

ferns, ginkgoes, and cycads

Question 10

leaves with net venation =

Answer 10

bundles branch often and usually connect with other bundles

Question 11

net venation vascular system =

Answer 11

closed

Question 12

dichotomous branched venation vascular system =

Answer 12

open

Question 13

net venation leaves are usually characterized as having (3)

Answer 13

a blade + petiole = the upper leaf

& a leaf base = lower leaf

Question 14

net venation main vein in leaf =

Answer 14

midrib

Question 15

leaves with parallel venation =

Answer 15

small bundles connect the large bundles

Question 16

leaves with parallel venation vascular system =

Answer 16

closed

Question 17

leaves with parallel venation form from

Answer 17

the expansion of the leaf base (lower leaf)

Question 18

leaves with parallel venation upper leaf is usually

Answer 18

a little brown tip or spine

Question 19

common leaf form in monocots (grasses, agaves, etc)

Answer 19

parallel venation

Question 20

bifacial leaf faces = (2)

Answer 20

palisade mesophyll + spongy mesophyll

Question 21

(bifacial leaf) ADaxial =

& whats there?

Answer 21

top

palisade mesophyll & xylem

Question 22

(bifacial leaf) ABaxial

& whats there?

Answer 22

bottom

spongy mesophyll & phloem

Question 23

palisade mesophyll purpose

Answer 23

to intercept as much light as possible

Question 24

spongy mesophyll purpose

Answer 24

have big air spaces for gas exchange (typically located around stomata)

Question 25

stomata location leaf types (3)

Answer 25

• Hypostomatous: stomata on bottom/abaxial (most plants)
• Hyperstomatous: stomata on top/adaxial (floating aquatic plants)
• Amphistomatous: stomata on both abaxial & adaxial

Question 26

bifacial leaf in the shade vs sun:

Answer 26

• shade: broad (increase chance to capture light/photons) & thin
• sun: narrow & thick (more mesophyll layers {for increased light absorbance} & epidermis layers {these leaves are more exposed to elements so for increased strength})

Question 27

unifacial leaf (corn) lacks

Answer 27

differentiation among mesophyll

Question 28

unifacial leaf (corn) usually

Answer 28

amphistomatous

Question 29

all mesophyll have

Answer 29

chloroplasts