Leaves

Question 1

Function of leaves

Answer 1

Photosynthesis
Transpiration
Gas Exchange

Question 2

Common features of leaves

Answer 2

Blade (Lamina)

Petiole, or leaf stalk

Question 3

Sessile

Answer 3

Leaves that do not have a petiole and often sheath

Question 4

Stipules

Answer 4

small leaf like growths near the base. May or may not be present.

Question 5

Where are buds located

Answer 5

in the axil of a leaf with the stem

Question 6

Simple Leaf

Answer 6

Undivided blade with a signle audillary bud at the base of its petiole

Question 7

Midrib

Answer 7

Main veign within a leaf

Question 8

Compound Leaf

Answer 8

Blade divided into leaflets which lack an axillary bud, but each compound leaf has a single bud at the base of its petiole

Question 9

Ternate

Answer 9

Compound leaves with three leaflets

Question 10

Pinnately-Compound

Answer 10

leaflets in pairs and attached along a central rachis

Question 11

Palmately-Compound

Answer 11

leaflets attached at the same point at the end of the petiole (Marijuana)

Question 12

Phyllotaxy

Answer 12

arrangement of leaves on a stem

Question 13

Different phyllotaxys

Answer 13

Opposite
Alternate
Whorled/Verticillate
Basal
Decussate

Question 14

Venation

Answer 14

arrangement of veins in a leaf

Question 15

Netted venation

Answer 15

one or few prominent midveins from which smaller veins branch into a meshed network; Common to dicots and some nonflowering plants

Question 16

Pinnately-veined leaves

Answer 16

main vein (midrib) with secondary veins branching from it

Question 17

Palmately-veined

Answer 17

veins radiate out of base of blade

Question 18

Dichotomous venation

Answer 18

no midrib or large veins. Veins have tendency to fork evenly from the base of the blade to the opposite margin, creating a fan shaped leaf

Question 19

Parallel venation

Answer 19

veins are practically side by side

Question 20

Radially netted venation

Answer 20

veins connect to a center point on midrib and flow out radially

Question 21

Netted or Reticulate venation

Answer 21

Netted-random? (forming net)

Reticulate - organized (parallel veins)

Question 22

Guard cells

Answer 22

concentrated on lower epidermis of most leaves.

Question 23

stomata

Answer 23

opening between guard cells

Question 24

Different trichomes

Answer 24

silky
wooly
prickly
felt-like
scaly
glandular

Question 25

Mesophyll

Answer 25

includes all of the internal cells of the leaf outside of the vascular bundles or veins. Photosynthesis occurs in the mesophyll layers

Question 26

Palisade mesophyll | Dicot

Answer 26

cells elongated to surface | contain many chloroplasts

Question 27

Spongy mesophyll | Dicot

Answer 27

many air spaces isodiamteric shape important in transpiration and CO2 movement

Question 28

Monocot Leaf Mesophyll

Answer 28

monocots usually do not have a distinctive palisade and spongy mesophyll monocots have parallel veins with a general mesophyll of loosely packed

Question 29

Provides support

Answer 29

vascular tissue

Question 30

Left after decomposition

Answer 30

skeleton

Question 31

Location of xylem

Answer 31

toward upper epidermis

Question 32

Location of phloem

Answer 32

toward lower epidermis

Question 33

Xylem

Answer 33

composed of vessels and fibers

Question 34

Phloem

Answer 34

composed of sieve tubes, companion cells and transfer cells

Question 35

Leaf Abscission

Answer 35

"to cutt off" Loss of leaves controlled by hormones

Question 36

Deciduous

Answer 36

a perennial which loses all of its leaves at one time in response to seasonal or climate differences.

Question 37

where is the abscission zone located

Answer 37

at the base of the petiole in a region of undifferentiated, small parenchyma cells

Question 38

Window leaves

Answer 38

grows in hot regions most of plant is buried and the top of the leaf is exposed (cactai)