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z - biosci 1223 (s&t) > Plant Form and Function > Flashcards

Plant Form and Function Flashcards

1
Q

Define cell

A

the fundamental unit of life

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2
Q

Define tissue

A

a group of cells consisting of one or more cell types that together perform a specialized function

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3
Q

Define organs

A

consists of several types of tissues that together carry out particular functions

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4
Q

Describe the arrangement of xylem and phloem in monocots

A

a core or parenchyma cells (pith) surrounded by alternating rings of xylem and phloem

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5
Q

Describe the arrangement of xylem and phloem in dicots

A

the xylem is a star with phloem between the arms

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6
Q

Do dicots or monocots have two layers of leaf mesophyll?

A

Dicots

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7
Q

Do dicots or monocots have common or rare secondary growth

A

rare-monocot, common-dicot

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8
Q

Describe nodes

A

nodes are where leaves/branches are attached, they alternate with internodes

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9
Q

What is the general function of apical buds?

A

To elongate young roots and shoots

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10
Q

What is the general function of axillary bud?

A

to form a lateral branch, thorn, or flower

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11
Q

What is the general function of stems?

A

to elongate and orient the shoot for photosynthesis

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12
Q

What are some examples of stems with specialized functions? Describe them

A

Rhizomes are underground stems, stolons serve in asexual reproduction, tubers

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13
Q

What are some functions of roots (3 main)?

A

Anchor, absorb minerals and water, stores carbohydrates

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14
Q

Describe the formation of roots in large or non-trailing plants

A

the primary root is the first to emerge, it branches to form lateral roots which improve anchorage and water absorption (most of the absorption happens here)

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15
Q

Describe the formation of roots in small or trailing plants

A

the primary root dies early on and adventitious roots come from the stem to make lateral roots

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16
Q

What is the main function of root hairs? How are they able to achieve this?

A

Root hairs (extensions of epidermal cells) form from the root tip and increase the absorptive surface

Make up 70-90% of the surface area

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17
Q

Name some generalized specialized functions of some roots

A

Support, oxygen, storage

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18
Q

What is the main function of leaves?

A

they are the main photosynthetic organ of most vascular plants (green stems do a little)

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19
Q

What are some side/minor functions of leaves (3)?

A

Exchange gas, dissipate heat, defend from herbivores and pathogens

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20
Q

What is the difference between gross primary productivity and net productivity in relation to plants?

A

The gross primary productivity is all the food made, the net is what we get

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21
Q

What is the function of a chromoplast?

A

it produces bad-tasting or poison compounds

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22
Q

What is the function of stomata?

A

They are pores in the epidermis that allow for gas exchange

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23
Q

Where are stomata located? Why?

A

Major avenues for evaporation loss (so most are on the lower side of the leaf)

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24
Q

What is the function of guard cells?

A

they open and close to control stomata

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25
Q

What are some specialized functions of leaves?

A

spines, reproduction, storage, tendrils

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26
Q

What basic plant organ is a flower? What special thing do they have? (not like petals or stuff like that)

A

Specialized leaves that have meristems

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27
Q

Do trees produces leaves on the previous year’s stem, other branches, or both?

A

Branches

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28
Q

Where do leaves develop from? Where do axillary buds develop from?

A

Leaf primordia along the sides of the shoot apical meristem, meristematic cells left at the base of apical meristems

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29
Q

What are the two major parts of a leaf?

A

A flattened blade and a stalk (petiole) (the petiole is not an actual part of the leaf but it connects the leaf to the stem)

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30
Q

Describe compound leaves

A

one blade divided into leaflets

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31
Q

How does a bud scar form?

A

it is the remainder of last year’s apical bud

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32
Q

(Leaves) What kind of tissue is between the upper and lower epidermis? What general category does it belong to? What kind of cells does it have?

A

Mesophyll, ground tissue, parenchyma

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33
Q

(Leaves) Describe the two layer tissue setup that is between the upper and lower epidermis in eudicots

A

mesophyll has two layers: the palisade in the upper part and the spongy in the lower part (loose arrangement for gas exchange)
Palisade is lined up in rows

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34
Q

What two functions do veins serve in leafs? What encloses them?

A

Veins are the leafs vascular bundles and skeleton

Each vein is enclosed by a protective bundle sheath

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35
Q

What type of tissue makes up most of a plant?

A

Secondary xylem

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36
Q

What are the three tissue systems in plants?

A

Dermal, vascular, ground

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37
Q

What is the function of the periderm?

A

a protective layer that replaces the epidermis in older spots (woody plants only, impermeable to water and gases)

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38
Q

What is the type of dermal tissue in nonwoody plants?

A

Epidermis

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39
Q

What is the function of a cuticle? What kind of tissue is it?

A

Prevents water loss, in the epidermis

40
Q

What are some functions of trichomes? What kind of tissue are they?

A

reduce water loss, reflect light, and can help defend against insects (can also secrete oil), epidermis

41
Q

What are the four groups that make up vascular plants?

A

Angiosperms, gymnosperms, ferns, lycophytes

42
Q

Describe the movement of water in xylem

A

water and minerals go upwards from the roots into the shoots

43
Q

Describe tracheids. What type of tissue are they are part of?

A

Long, thin cells with tapered ends (all vascular plants)
Water moves between these through pits, thin regions lacking secondary walls

a type of cell in xylem

44
Q

Describe vessel elements. What type of tissue are they part of? What kinds of plants are they found in?

A

Common to most angiosperms, and a few gymnosperms and a few seedless vascular plants
End walls have perforation plates so water can flow freely
Xylem

45
Q

Describe the movement of sugars in phloem

A

from the production area (mostly leaves) to storage structures or areas of growth

46
Q

What kinds of plants have sieve cells?

A

seedless vascular plants and gymnosperms

47
Q

Describe sieve tubes using the words sieve-tube elements, sieve plates, companion cell, and plasmodesmata

A

Chains of cells are called sieve-tube elements
Sieve plates are porous end walls between sieve-tube elements that allow fluid to flow between cells
Each sieve-tube element is connected to a companion cell (that has organelles) by plasmodesmata
Their nucleus and ribosomes also serve adjacent ones
Sieve tube elements are food-conducting tubes that are located in the phloem

48
Q

What is weird about the cells that make up phloem?

A

they are alive, but lack organelles

49
Q

Describe pith

A

ground tissue internal to the vascular tissue

50
Q

Describe cortex

A

ground cells that are external to the vascular tissue

51
Q

Parenchyma, collenchyma, or sclerenchyma- dead at functional maturity

A

sclerenchyma are dead at functional maturity

52
Q

Parenchyma, collenchyma, or sclerenchyma- lack secondary walls, have thin and flexible primary walls

A

parenchyma lack secondary walls, have thin and flexible primary walls

53
Q

Parenchyma, collenchyma, or sclerenchyma- purpose is to provide flexible support without restraining growth

A

collenchyma provide flexible support without restraining growth

54
Q

Parenchyma, collenchyma, or sclerenchyma- most of the ground tissue

A

parenchyma make up most of the ground tissue

55
Q

Parenchyma, collenchyma, or sclerenchyma- retain the ability to divide and differentiate

A

parenchyma retain the ability to divide and differentiate

56
Q

Parenchyma, collenchyma, or sclerenchyma- a large central vacuole

A

parenchyma have a large central vacuole

57
Q

Parenchyma, collenchyma, or sclerenchyma- rigid because of thick secondary walls with lignin

A

sclerenchyma are rigid because of thick secondary walls with lignin

58
Q

Parenchyma, collenchyma, or sclerenchyma- unevenly thickened primary cell walls

A

collenchyma have unevenly thickened primary cell walls

59
Q

Parenchyma, collenchyma, or sclerenchyma- perform the most metabolic functions (ex: photosyntesis)

A

parenchyma perform the most metabolic functions

60
Q

Parenchyma, collenchyma, or sclerenchyma- grouped into strands to help support young or herbaceous parts of plant shoots

A

collenchyma are grouped into strands to help support young or herbaceous parts of plant shoots

61
Q

Describe the two types of sclerenchyma cells

A

Sclereids are short and irregular in shape and have thick, lignified secondary walls
Fibers are long and slender and arranged in threads

62
Q

What kind of tissues are in “bark”?

A

everything that is external to the vascular cambium, including secondary phloem and periderm

63
Q

What is the function of lenticels?

A

Lenticels in the periderm allow gas exchange between the living parts of the stem/root and air

64
Q

What is the term for continuous growth?

A

indeterminate

65
Q

What are meristems?

A

unspecialised tissues made of dividing cells

66
Q

What are initials?

A

Initials (stem cells) remain in the meristem and produce more cells

67
Q

What is the process that is responsible for increase in plant size? How does it work? How does it relate to microfibrils?

A

cell elongation
Cells grow rapidly with little energy by taking in water, storing in vacuoles

Cellulose microfibrils in the cell wall restrict the direction of elongation

68
Q

Describe the difference between annuals, biennials, and perennials

A

Annuals complete their life cycle in a year or less
Biennials require two growing seasons (first year is non-reproductive)
Perennials live for many years

69
Q

What is developmental plasticity?

A

the effect of environment on development

70
Q

What is morphogenesis?

A

the development of body form and cell organization

71
Q

What determines cell differentiation in plants?

A

Differentiation depends on gene expression, but is determined by position

72
Q

What is the symmetry of cell division in plants?

A

Asymmetrical division signals many key events in development. The first division of a zygote is asymmetrical and initiates polarization

73
Q

Relate polarity and the structure of plants

A

Polarity is the condition of having structural or chemical differences at opposite ends
Plants have an axis with a root end and a shoot end

74
Q

What is pattern formation? What are the two theories as to how it relates to the fate of plant cells?

A

the development of specific structures in specific locations
Lineage-based mechanisms (Cell fate is determined early in development and passed on to daughter cells) or
Position-based mechanisms
(Cell fate is determined by final position)

75
Q

Give an example of how gene activation depends on cell-to-cell communication

A

Arabidopsis root epidermis forms root hairs depending on the # of cortical cells it touches
Formation of root hairs is dependent on the differential expression of the GLABRA-2 gene

76
Q

Describe the ABC hypothesis of flower formation

A

A gene activity makes sepals, A and B gene activity makes petals, B and C gene activity makes stamens, and C gene activity makes carpels
Mutants lacking A have only carpels and stamens, mutants lacking B have only carpels and sepals, and mutants lacking C have only sepals and petals

77
Q

Give some examples of why Arabidopsis is a model organism

A

Small size, short generation time, prolific seed production, and small genome size (first plant to have genome sequenced,
27,000 genes divided among five pairs of chromosomes)
Outward appearance varies markedly with different environmental conditions

78
Q

Where are apical meristems located? What function do they serve?

A

Located at the tips of roots and shoots

Elongate shoots and roots

79
Q

Describe apical dominance

A

Apical merstems Send out hormones that prevent the growth of lateral branches/axillary buds
The closer they are, the more inhibited it is
The apical dominance is stopped if the shoot tip is removed or shaded

80
Q

What three things do apical meristems produce? What do those make?

A

Protoderm, which makes dermal tissue
Ground meristem (middle), which makes ground tissue
Procambium, which makes vascular tissue

81
Q

What is the function of a root cap?

A

protects the apical meristem

82
Q

What are the three zones of growth in roots?

A

Cell division
Elongation (by taking up lots of water)
Differentiation/Maturation

83
Q

What kind of cells fill the cortex?

A

ground tissue (mostly parenchyma)

84
Q

What is the innermost layer of the cortex called? What does it do?

A

endodermis
Regulates passage of substances from soil to vascular cylinder
Protects against poisons and viruses

85
Q

What is the function of pericycle? Where is it?

A

The vascular cylinder of roots has a solid core of xylem and phloem surrounded by a cell layer called pericycle
Lateral roots arise from the pericycle and destructively push through the outer tissues

86
Q

What is the general product of the vascular cambium?

A

layers of secondary xylem (wood) and phloem

87
Q

What does secondary xylem consist of? (3)

A

tracheids, vessel elements (in angiosperms), and fibers

88
Q

Relate early and late wood

A

Early wood is formed in the spring in temperate region and has thin cell walls to maximize water delivery
Late wood is formed in the summer and has thick cell walls for support

89
Q

Define dendrochronlogy

A

Tree rings are visible where late and early wood meet and can be used to estimate a tree’s age
Dendrochronology is the analysis of tree ring growth patterns and can be used to study climate change
Thick rings=warm/wet year
Thin rings=cold/dry year

90
Q

Relate heartwood and sapwood

A

Heartwood is older layers of xylem that no longer function

Sapwood is outer layers that still transport materials

91
Q

What happens to old secondary pholem?

A

sloughs off and does not accumulate

92
Q

What is the direction of production for secondary xylem and phloem?

A

Xylem is towards the core, phloem is towards the outside

93
Q

What is the function of elongated initials? How are they arranged?

A

Oriented parallel to the axis of the stem or root
Produce tracheids, vessel elements, fibers of xylem, sieve-tube elements, companion cells, axially oriented parenchyma, and phloem fibers

94
Q

What is the function of shorter initials? How are they arranged?

A

Oriented perpendicular to the axis of the stem or root

Produce vascular rays (Radial files of parenchyma cells that connect secondary xylem and phloem)

95
Q

What is the function of the cork cambium?

A

Replaces the epidermis with periderm (towards the outside)

z - biosci 1223 (s&t) (16 decks)

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