Chapter 7

Question 1

All leaves originate as

Answer 1

primordia in the buds

Question 2

Petiole

Answer 2

Stalk that attaches leaf to twig

Question 3

Blade/Lamina

Answer 3

Flattened actual leaf part, contains a network of veins called vascular bundles

Question 4

Leaves that lack petioles are called

Answer 4

sessile

Question 5

deciduous

Answer 5

The leaves of these trees live only one year.

Question 6

Simple Leaf

Answer 6

has a single blade

Question 7

Compound Leaf

Answer 7

the blade is divided various ways into leaflets

Question 8

Regardless of the number of leaflets, a compound leaf still has

Answer 8

a single axillary bud at its base, the leaflets do not

Question 9

Pinnately Compound

Answer 9

have the leaves in pairs along an extension of the petiole called the rachis

Question 10

Rachis

Answer 10

Extension of the Petiole

Question 11

Palmately Compound

Answer 11

have all the leaflets attached at the same point at the end of the petiole

Question 12

Stomata

Answer 12

primarily found on the bottom of the leaf, small pores that play an essential role in gas exchange

Question 13

Stomatal Apparatus consists of

Answer 13

a pore bordered by a pair of sausage shaped guard cells. Controls water loss when guard cells inflate or deflate

Question 14

Transpiration

Answer 14

Most water evaporates in vapor form into the atmosphere through this process

Question 15

Hydathodes

Answer 15

Found at the tips of leaf veins

Question 16

Root openings force

Answer 16

Liquid water out of hydathodes, this is called guttation

Question 17

Nodes

Answer 17

Region at which the leaf is attached to the stem

Question 18

Internodes

Answer 18

Stem region between nodes

Question 19

Pinnately veined

Answer 19

One primary vein

Question 20

Midrib

Answer 20

Primary vein of pinnately veined leaves.

Question 21

Palmately veined

Answer 21

Several primary veins fan out from the base of the blade

Question 22

Netted/reticulate venation

Answer 22

The branching arrangement of veins in dicots

Question 23

Dichotomous Venation

Answer 23

Veins fork evenly and progressively from the base of the blade to the opposite margin

Question 24

Mesophyll

Answer 24

Region where photosynthesis takes place

Question 25

Palisade mesophyll

Answer 25

Comprised of parenchyma cells that are usually aligned in two rows.contains 80% of the leafs chloroplast

Question 26

Spongy mesophyll

Answer 26

Loosely arranged parenchyma cells with abundant air spaces between them. Play a role in gas exchange

Question 27

Chlorenchyma

Answer 27

Parenchyma tissue with chloroplasts.

Question 28

Veins (vascular bundles)

Answer 28

Consist of xylem and phloem tissues.

Question 29

Bundle sheath

Answer 29

Surround the vascular bundles with a thicker walled parenchyma cells

Question 30

Monocot veins

Answer 30

Parallel

Question 31

Bulliform cells

Answer 31

Under dry conditions, the bulliform cells partly collapse, causing the leaf blade to fold or roll.

Question 32

Modifications to an arid leaf

Answer 32

Sunken stomata, thick cuticle, and a layer of thick walled cells (hypodermis) beneath the epidermis

Question 33

Leaves of aquatic plants

Answer 33

Have considerably less xylem and phloem And the mesophyll, which isn’t divided into spongy and palisade, have larger air spaces

Question 34

Tendrils

Answer 34

Modified leaves that climb up more rigid objects to reach sunlight

Question 35

Spines

Answer 35

Reduce water loss Protect from browsing animals

Question 36

Thorns

Answer 36

Spine like objects that arise in the axils of leaves of woody plants, modified stem more than modified leaf.

Question 37

Prickles

Answer 37

Neither leaves nor stems, but rather outgrowths from the epidermis or cortex

Question 38

Succulent leaves

Answer 38

Leaves that are modified for water retention

Question 39

Flower pot leaves

Answer 39

Leaf pods that become the home of ant colonies. Ants carry dirt in, allowing the leaf to grow roots, the ants die and provide fertilizer for plant.

Question 40

Window leaves

Answer 40

Mostly underground leaf with a mostly transparent covering at the ground surface. This transparent covering allows light to directly hit the chloroplasts

Question 41

Color of: Chloroplasts

Answer 41

Green

Question 42

Color of: Carotenes

Answer 42

Yellow

Question 43

Color of: Santhophylls

Answer 43

Pale yellow

Question 44

Abscission

Answer 44

The process by which leaves are shed