Chapter 7 Flashcards

Leaves

1
Q

All leaves originate as

A

primordia in the buds

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2
Q

Petiole

A

Stalk that attaches leaf to twig

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3
Q

Blade/Lamina

A

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

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4
Q

Leaves that lack petioles are called

A

sessile

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5
Q

deciduous

A

The leaves of these trees live only one year.

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6
Q

Simple Leaf

A

has a single blade

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7
Q

Compound Leaf

A

the blade is divided various ways into leaflets

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8
Q

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

A

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

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9
Q

Pinnately Compound

A

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

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10
Q

Rachis

A

Extension of the Petiole

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11
Q

Palmately Compound

A

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

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12
Q

Stomata

A

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

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13
Q

Stomatal Apparatus consists of

A

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

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14
Q

Transpiration

A

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

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15
Q

Hydathodes

A

Found at the tips of leaf veins

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16
Q

Root openings force

A

Liquid water out of hydathodes, this is called guttation

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17
Q

Nodes

A

Region at which the leaf is attached to the stem

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18
Q

Internodes

A

Stem region between nodes

19
Q

Pinnately veined

A

One primary vein

20
Q

Midrib

A

Primary vein of pinnately veined leaves.

21
Q

Palmately veined

A

Several primary veins fan out from the base of the blade

22
Q

Netted/reticulate venation

A

The branching arrangement of veins in dicots

23
Q

Dichotomous Venation

A

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

24
Q

Mesophyll

A

Region where photosynthesis takes place

25
Q

Palisade mesophyll

A

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

26
Q

Spongy mesophyll

A

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

27
Q

Chlorenchyma

A

Parenchyma tissue with chloroplasts.

28
Q

Veins (vascular bundles)

A

Consist of xylem and phloem tissues.

29
Q

Bundle sheath

A

Surround the vascular bundles with a thicker walled parenchyma cells

30
Q

Monocot veins

A

Parallel

31
Q

Bulliform cells

A

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

32
Q

Modifications to an arid leaf

A

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

33
Q

Leaves of aquatic plants

A

Have considerably less xylem and phloem

And the mesophyll, which isn’t divided into spongy and palisade, have larger air spaces

34
Q

Tendrils

A

Modified leaves that climb up more rigid objects to reach sunlight

35
Q

Spines

A

Reduce water loss

Protect from browsing animals

36
Q

Thorns

A

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

37
Q

Prickles

A

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

38
Q

Succulent leaves

A

Leaves that are modified for water retention

39
Q

Flower pot leaves

A

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.

40
Q

Window leaves

A

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

41
Q

Color of: Chloroplasts

A

Green

42
Q

Color of: Carotenes

A

Yellow

43
Q

Color of: Santhophylls

A

Pale yellow

44
Q

Abscission

A

The process by which leaves are shed