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Botany > Leaves > Flashcards

Leaves Flashcards

1
Q

Originate as primordia in buds

A

Leaves

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2
Q

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

A

Petiole
Lamina
Vascular bundles

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3
Q

Leaves with a petiole are

A

Petiolate

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4
Q

Leaves without a petiole are

A

Sessile

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5
Q

It has a single blade

A

Simple leaves

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6
Q

It has their blades divided into leaflets

A

Compound leaves

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7
Q

They have leaflets in pairs along rachis.

A

Pinnately compound

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8
Q

They have all leaflets attached at same point of petiole.

A

Palmately compound

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9
Q

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

A

Photosynthesis

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10
Q

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

A

Stomata

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11
Q

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

A

Guard cells

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12
Q

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

A

Abscission

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13
Q

Evaporation of water from leaf surface

A

Transpiration

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14
Q

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

A

Guttation

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15
Q

Arrangement of veins in a leaf or leaflet blade

A

Venation

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16
Q

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

A

Pinnately veined

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17
Q

Several primary veins fan out from base of blade.

A

Palmately Veined

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18
Q

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

A

True

19
Q

Transversely, the leaf is made of:

A

Epidermis, Mesophyll, Vascular bundles

20
Q

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

A

Epidermis

21
Q

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

A

Epidermis

22
Q

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

A

Stomata

23
Q

Where photosynthesis takes place

A

Mesophyll

24
Q

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

A

Palisade Mesophyll

25
Q

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

A

Spongy Mesophyll

26
Q

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

A

Veins

27
Q

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

A

Monocot Mesophyll

28
Q

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

A

Bulliform Cells

29
Q

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

A

Shade Leaves

30
Q

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

A

Arid Regions

31
Q

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

A

Aquatic Leaves

32
Q

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

A

Tendrils

33
Q

● Reduce leaf surface and water loss
● Protect from herbivory

A

Spines

34
Q

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

A

Thorns

35
Q

They are outgrowths from epidermis or cortex

A

Prickles

36
Q

Succulent leaves store _______ ; Fleshy leaves store _______

A

Water ; carbohydrates

37
Q

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

A

Flower-Pot Leaves

38
Q

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

A

Window Leaves

39
Q

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

A

Reproductive Leaves

40
Q

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

A

Bracts

41
Q

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

A

Insect-Trapping Leaves

42
Q

Chlorophylls are _________.
Carotenoids are _________.
Anthrocynanin are _________

A

Green
Yellow or orange
Red

43
Q

Cells of protective layer are coated and impregnated with suberin.

A

Abscission Zone

Botany (11 decks)

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