Leaves Chapter 7 (Week 3 Lecture 4)

Question 1

True or False: All leaves originate as primordia in buds.

Answer 1

True

Question 2

Leaves of flowering plants associated with ______ ______ and have ______ buds at base.

Answer 2

Leaf gaps, axillary

Question 3

Stalk of leaf is also known as ______.

Answer 3

Petiole

Question 4

True or False: Leaves sessile if lacking petiole.

Answer 4

True

Question 5

______ are at the base of the petiole.

Answer 5

Stipules

Question 6

The flattened blade is also known as the ______.

Answer 6

Lamina

Question 7

What are simple leaves?

Answer 7

Leaves with a single blade

Question 8

Compound leaves ar leaves with their blades divided into ______.

Answer 8

Leaflets

Question 9

What is the difference between pinnately (bipinnately) compound leaves and palmately compound leaves?

Answer 9

Pinnately leaves - Leaflets in pairs along rachis (petiole)

Palmately compound leaves - All leaflets attached at same point at end of petiole

Question 10

Trapping and storing of energy in sugar molecules that are constructed from water and carbon dioxide is known as?

Answer 10

Photosynthesis

Question 11

What are stomata?

Answer 11

Tiny pores on lower surfaces of leaves

Question 12

What is the function of stomata?

Answer 12

Allow carbon dioxide to enter and oxygen to diffuse out

Question 13

______ cells control water loss by opening (swell) or closing (contract) pore of ______ apparatus.

Answer 13

Guard, stomatal

Question 14

Why do leaves fall off?

Answer 14

Wastes from metabolic processes accumulate in leaves and are disposed of when leaves are shed.

Question 15

______ occurs when water evaporates from leaf surface.

Answer 15

Transpiration

Question 16

______ is when root pressure forces water out hydathodes at tips of leaf veins in some plants.

Answer 16

Guttation

Question 17

What is phyllotaxy?

Answer 17

Arrangement of leaves on stem

Question 18

______ is the arrangement of veins in a leaf or leaflet blade .

Answer 18

Venation

Question 19

True or False: Palmately veined leaves have a main mid-vein included within enlarged midrib.

Answer 19

False, palmately veined leaves have several primary veins fan out from base of blade

Question 20

True or False: Monocots have netted or reticulate ventilation

Answer 20

False, dicots have netted or reticulate venation while monocots have parallel venation

Question 21

______ venation is when veins fork evenly and progressively from base of blade.

Answer 21

Dichotomous

Question 22

Where does most photosynthesis take place?

Answer 22

Takes place in the mesophyll between the two epidermal layers

Question 23

Most of the leafs chloroplasts are found in the ______ mesophyll.

Answer 23

Palisade

Question 24

What is spongy mesophyll?

Answer 24

Loosely arranged parenchyma cells with abundant air spaces

Question 25

______ consist of xylem and phloem tissues surrounded by bundle sheath of thicker-walled parenchyma

Answer 25

Veins

Question 26

What do monocots have that dicots do not in there mesophyll and veins?

Answer 26

Bulliform cells

Question 27

What are bulliform cells?

Answer 27

Causes leaf to fold or roll, reducing transpiration

Question 28

______ leaves have fewer defined mesophyll layers and fewer chloroplasts and have fewer hairs.

Answer 28

Shade

Question 29

Leaves of arid region s reduce loss of water by what four characteristics?

Answer 29

Thick, leathery leaves Fewer stomata or sunken stomata Succulent, water-retaining leaves, or no leaves Dense, hairy coverings

Question 30

True or False: Leaves of aquatic areas have less xylem and phloem.

Answer 30

True

Question 31

______ are modified leaves that curl around more rigid objects, helping the plant to climb or to support weak stems found in garden peas.

Answer 31

Tendrils

Question 32

______ are modified leaves that reduce leaf surface and water loss, and protect from herbivory found in cacti.

Answer 32

Spines

Question 33

______ are modified stems arising in the axils of leaves of woody plants.

Answer 33

Thorns

Question 34

______ are outgrowths from epidermis or cortex.

Answer 34

Prickles

Question 35

Storage leaves have ______ cells with large vacuoles.

Answer 35

Parenchyma

Question 36

What is the function of flower pot leaves?

Answer 36

Leaves develop into urn-like pouches that become home of ant colonies

Question 37

______ leaves allow light into leaf, while buried leaves keep plant from drying out.

Answer 37

Window

Question 38

Walking fern and air plant have ______ leaves.

Answer 38

Reproductive

Question 39

Poinsettia and Clary's sage are known as ______ leaves or ______.

Answer 39

Floral, bracts

Question 40

True or False: Insect-trapping leaves grow in swampy areas and bogs where nitrogen and other elements are deficient in soil.

Answer 40

True

Question 41

Pitcher plants, sundews and venus fly-traps are examples of what type of specialized leaves?

Answer 41

Insect-trapping

Question 42

What type of insect-trapping leaves can be found in water?

Answer 42

Bladderworts

Question 43

In fall, ______ break down and other colors are revealed.

Answer 43

chlorophylls

Question 44

What type of plant drops leaves seasonally?

Answer 44

Deciduous

Question 45

______ is the process by which leaves are shed

Answer 45

Abscission

Question 46

How do leaves fall off during abscission (separation layer).

Answer 46

Pectins in middle lamella of cells are broken down by enzymes