LEAF Flashcards

1
Q

other plant organ that, along with stems, constitutes the shoot of the plant body. Its principal function is to act as the main site of photosynthesis in a plant.

A

leaf

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The leaf consists of a flattened laminar portion called the

A

blade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The leaf consists of a stalk and which attaches the blade to the stem

A

petiole

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

If the blade is attached directly to the stem, the leaf is described as

A

sessile

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Leaves arise from an apical or lateral bud that is often protected by

A

bud scales

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

are small leaf-like structures which develop in pairs on each side of the leaf during the growing season

A

Stipules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

In monocots, the blades are usually narrow whose base, wholly or partly encloses the stem

A

sheath

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Between the blade and the sheath, some monocot plants have appendages such as

A

auricles and ligules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

persistent meristem at the base of the leaf that allows it to grow indefinitely in monocots

A

true

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The most common shapes

A

linear (thin), lanceolate (like a spear), ovate (oval) and cordate (heart-shaped).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

lined with the veins; the middle portion of the blade usually has a prominent central vein

A

blade or lamina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

prominent central vein, while smaller veins radiate from this

A

midrib

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

veins are arranged differently in monocots and dicots, explain

A

Dicots display netted venation while monocots usually have parallel venation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

edge of the blade is called

A

margin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

margin types

A

toothed, lobed or entire.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

leaf tip

A

apex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

part near the petiole is called

A

leaf base

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

There are two types of leaves

A

There are two types of leaves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

a single blade or lamina and may have any of the above characteristics
They may be deeply lobed.

A

simple leaf

20
Q

is composed of two or more separate leaflets.

A

compound leaf

21
Q

There are two basic kinds of compound leaves:

A

There are two basic kinds of compound leaves:

22
Q

the leaflets occur in a linear sequence lined up along both sides of a central axis

A

pinnately compound leaf

23
Q

central axis

A

rachis

24
Q

which three, five, seven or more leaflets are all attached at one point near the tip of the petiole and they radiate out from this tip.

A

palmate compound leaf

25
Q

How do you tell if a leaf is compound?

A

Look at the base of the leaf or petiole where it is attached to the stem. If there is a bud in the angle formed by the petiole and stem, like an axillary bud, then the entire structure supported by the petiole is a leaf, regardless of the number of leaflets present. All the leaflets of a compound leaf occur in the same plane. Also, some very large pinnately compound leaves sometimes resemble an entire branch. The branch will have a terminal bud, but a compound leaf won’t have a terminal branch.

26
Q

Leaf arrangement is referred to

A

phyllotaxy

27
Q

one leaf occurs at each node

A

alternate or spiral arrangement

28
Q

alternate and the leaves occur only on two rows

A

distichous

29
Q

two leaves at a node facing each other

A

opposite

30
Q

which two opposite leaves are perpendicular to the two opposite leaves below or above them

A

decussate

31
Q

arrangement has three or more leaves at one node

A

whorled

32
Q

outermost layer of cells

A

epidermis

33
Q

These epidermal cells secrete a waxy substance which forms a covering over the outer dermal cells rendering these cells impermeable to water. The waxy covering is called

A

cuticle

34
Q

There is an upper epidermis and a lower epidermis in a leaf with

A

dorsiventral

35
Q

The openings in the epidermis are called

A

stomates

36
Q

stomates which are formed between specialized epidermal cells called

A

guard cells

37
Q

are found on the undersurface of the leaves and herbaceous stems

These help reduce evaporation of water from plants or protect young shoots from herbivores.

A

trichomes

38
Q

with the exception of the vascular bundles, comprises all of the cells between the upper and lower epidermis and is usually divided into two parts.

A

mesophyll

39
Q

The cells toward the upper epidermis, which are elongated, make up the

A

palisade layer

40
Q

The zone below the palisade layer, composed of irregularly shaped cells

A

spongy layer

41
Q

are found between mesophyll cells

A

Inter-cellular air spaces

42
Q

In some monocots, there is no distinct palisade and spongy layers because the leaves are
all the parenchyma cells with chloroplast between the upper and lower epidermis comprise the mesophyll layer.

A

isobilateral

43
Q

function both as supporting and conducting tissue.

A

vascular bundles

44
Q

They are composed of two fundamental tissues:

A

xylem and phloem

45
Q

These conducting tissues are surrounded by vascular bundle sheath cells and are collectively called

A

veins