Leaves

Question 1

Originate as primordia in buds

Answer 1

Leaves

Question 2

Stalk : ________
Flattened blade : _________
Network of veins : _________

Answer 2

Petiole
Lamina
Vascular bundles

Question 3

Leaves with a petiole are

Answer 3

Petiolate

Question 4

Leaves without a petiole are

Answer 4

Sessile

Question 5

It has a single blade

Answer 5

Simple leaves

Question 6

It has their blades divided into leaflets

Answer 6

Compound leaves

Question 7

They have leaflets in pairs along rachis.

Answer 7

Pinnately compound

Question 8

They have all leaflets attached at same point of petiole.

Answer 8

Palmately compound

Question 9

Trapping and storing of energy in sugar molecules that are constructed from water and carbon dioxide

Answer 9

Photosynthesis

Question 10

● Tiny pores on lower surfaces of leaves
● Allow carbon dioxide to enter and oxygen to diffuse out

Answer 10

Stomata

Question 11

● control water loss.
● Open or close pore of stomatal apparatus

Answer 11

Guard cells

Question 12

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

Answer 12

Abscission

Question 13

Evaporation of water from leaf surface

Answer 13

Transpiration

Question 14

Root pressure forces water out hydathodes at tips of leaf veins in some plants.

Answer 14

Guttation

Question 15

Arrangement of veins in a leaf or leaflet blade

Answer 15

Venation

Question 16

● One primary vein (midvein) in an enlarged midrib
● Secondary veins branch from midvein

Answer 16

Pinnately veined

Question 17

Several primary veins fan out from base of blade.

Answer 17

Palmately Veined

Question 18

In monocots, primary veins are parallel. In dicots, veins are netted or reticulate. True or false?

Answer 18

True

Question 19

Transversely, the leaf is made of:

Answer 19

Epidermis, Mesophyll, Vascular bundles

Question 20

● Single layer of cells covering the entire surface of the leaf
● Devoid of chloroplasts
● Coated with cuticle

Answer 20

Epidermis

Question 21

● Functions to protect tissues inside leaves
● Waste materials may accumulate in cells.
● Different types of glands may also be present

Answer 21

Epidermis

Question 22

● Regulate gas exchange between leaf interior and atmosphere
● Regulate evaporation of water
● Open when guard cells are filled with water

Answer 22

Stomata

Question 23

Where photosynthesis takes place

Answer 23

Mesophyll

Question 24

● Compactly stacked, barrel-shaped parenchyma cells
○ Commonly in two rows
● Contains most of leaf’s chloroplasts

Answer 24

Palisade Mesophyll

Question 25

● Loosely arranged parenchyma cells with abundant air spaces ● Allows free movement of carbon dioxide

Answer 25

Spongy Mesophyll

Question 26

● Vascular bundles scattered in mesophyll. ● Consist of xylem and phloem surrounded by bundle sheath of thicker-walled parenchyma

Answer 26

Veins

Question 27

● Usually do not have mesophyll differentiated into palisade and spongy layers ● Often have bulliform cells on either side of main central vein

Answer 27

Monocot Mesophyll

Question 28

● Partly collapse under dry conditions ● Causes leaf to fold or roll ● Reduces transpiration

Answer 28

Bulliform Cells

Question 29

● Receive less total light than sun leaves ● Compared to sun leaves ○ Larger and thinner ○ Fewer well-defined mesophyll layers and chloroplasts ○ Fewer hairs

Answer 29

Shade Leaves

Question 30

● Thick, leathery leaves ● Fewer stomata or sunken stomata ● Succulent leaves or no leaves ● Dense, hairy leaves

Answer 30

Arid Regions

Question 31

● Less xylem and phloem ○ Transpiration does not work here. ● Mesophyll not differentiated ● Large air spaces

Answer 31

Aquatic Leaves

Question 32

● Curl around more rigid objects ● Help the plant to climb or to support weak stems

Answer 32

Tendrils

Question 33

● Reduce leaf surface and water loss ● Protect from herbivory

Answer 33

Spines

Question 34

They are modified stems arising in the axils of leaves of woody plants

Answer 34

Thorns

Question 35

They are outgrowths from epidermis or cortex

Answer 35

Prickles

Question 36

Succulent leaves store _______ ; Fleshy leaves store _______

Answer 36

Water ; carbohydrates

Question 37

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

Answer 37

Flower-Pot Leaves

Question 38

● Leaves buried in ground, except for exposed end. ● End has transparent, thick epidermis and transparent water storage cells underneath.

Answer 38

Window Leaves

Question 39

● Walking ferns produce new plants at leaf tips. ● Air plants make tiny plantlets along leaf margins

Answer 39

Reproductive Leaves

Question 40

● Look like flowers ● At bases of flowers or flower stalks

Answer 40

Bracts

Question 41

● Trap and digest insects ● Nitrogen and other elements are deficient in soil.

Answer 41

Insect-Trapping Leaves

Question 42

Chlorophylls are _________. Carotenoids are _________. Anthrocynanin are _________

Answer 42

Green Yellow or orange Red

Question 43

Cells of protective layer are coated and impregnated with suberin.

Answer 43

Abscission Zone