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Plant and Fungal Biology > Exam 2 > Flashcards

Exam 2 Flashcards

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1
Q

Monokaryotic (n)

A

cell has one or more haploid nuclei of a single genetic type

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2
Q

Plasmogamy

A

sexual fusion of cytoplasm of two cells, and followed by karyogamy

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3
Q

Dikaryotic (n+n) “heterokaryotic”

A

a cell containing genetically different nuclei

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4
Q

Karyogamy

A

fusion of two nuclei

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5
Q

Hyphae

A

filaments comprising the body of fungus. chains of connected cells

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6
Q

sexual reproduction of fungi cycle (8)

A
  1. meiosis 2. haploid 3. gametes. 4. haploid and monokaryotic 5. plasmogamy 6. haploid and dikaryotic 7. Zygote Karyogamy 8. Diploid
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7
Q

Sexual reproduction may

involve union of (4):

A
  1. hyphae
  2. motile gametes
  3. male and female gametangia
  4. female gametangium with motile or non-motile sperm
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8
Q

yeast

A

single globular cell body type, morphological not taxonomical

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9
Q

mycelium

A

mass of many hyphae, clustered in one fungal body, located underground

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10
Q

coenocytic

A

the multinucleate hyphae without cell walls in mycelium

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11
Q

budding

A

(yeast) mitotic cell division is the common way the fungus exploits a resource-rich environment

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12
Q

asexual spores (mitospores)

A

spores produced by mitosis

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13
Q

asexual reproduction of fungi cycle

A
  1. mycelium 2. mitosis 3. spores 4. germination
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14
Q

modes of asexual reproduction

A

fragmenation, budding, and asexual spores (mitospores)

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15
Q

two main body forms of fungi

A

mycelium and yeast

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16
Q

mycelium septate

A

cell walls separating each successfully arranged cell with a nucleus in mycelium

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17
Q

evolutionary origin of fungi

similarities to animals (3)

A

opisthokonta eukaryotic supergroup (posterior flagellum).
similarities of animals and fungi:
1. similar DNA sequence for ribosomal RNA involved in protein synthesis
2. motile cells have flagella
3. mannitol and trehalose are similar to storage compounds in animals

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18
Q

distinguishing features of fungi (7)

domain, mode of nutrition, cell walls, _loid nuclei, sexual or asexual spores?

A

1) Eukaryotic, membrane-bound organelles- ER, vacuoles, and mitochondria
2) Hyphae, apical growth, mycelium, yeast
3) Heterotrophs
4) Cell walls made of chitin and glucans
5) Storage compounds – mannitol, trehalose, glycogen
6) Haploid nuclei
7) Sexual and asexual spores

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19
Q

distinguishing features and evolutionary origins of chytridiomycota (6) cell walls?, single or multicellular?, found where, haploid or diploid, about spores, structure

A

earliest branch of fungi.

  1. have chitin and glucans in cell walls
  2. only true fungi that produce motile flagellated spores
  3. typically singe-celled
  4. found on decaying matter in moist soils or aquatic environments or rumen of animals
  5. anchored to their organic substrates with thin tapering rhizoids
  6. alternate between two generations: haploid and diploid
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20
Q

distinguishing features and evolutionary origins of zygomycota (5) haploid or diploid, about spores,

A

second branch of fungi.

  1. Ceonocyctic (hyphae without septa)
  2. Haploid only generation (monobiontic)
  3. Only group to produce large, resting zygospores after karyogamy
  4. sexual spores produced in large sporangia on stalk
  5. Rhizopus is the genus for bread mold
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21
Q

distinguishing features and evolutionary origins of glomeromycota (5)

A

third branch of fungi

  1. Form mycorrhizae with roots of plants, type of mycorrhizae called VAM
  2. use arbuscule for symbiotic exchange with plants.
  3. use vesicles to store lipids
  4. fossils from devonian period show widespread association between fungi and roots of early plants like in Asteroxylon and Rhynia
  5. asexual reproduction only
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22
Q

apical growth

A

they add and grow new cells on the terminal ends of the filaments the apex or the apices

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23
Q

heterotroph

A

they need pre-formed organic compounds as energy and also as carbon skeletons for biosynthesis of other compounds

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24
Q

chitin

A

part of cell wall, long chains of glucosamine a nitrogen containing molecule that is derived from glucose

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25
Q

glucan

A

part of the cell wall, branched polymers of the simple glucose molecule

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26
Q

mannitol

A

fungi store energy in this sugar alcohol

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27
Q

trehelose

A

fungi store energy in this disaccharide

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28
Q

rhizoids

A

long, tapering root-like absorptive. secrete enzymes that break down complex organic material into simpler forms to be absorbed by the fungus

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29
Q

zoospores

asexual vs sexual reproduction

A

asexual reproduction- with the release of motile zoospores after finding a suitable substrate the diploid asexual zoospores will form dormant cysts.
sexual reproduction- cells of the
diploid fungus body form sporangia and through meiosis form haploid zoospores
they are motile with a single flagellum and appear to be very similar to the flagellated cells of animals so we call them zoospores these

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30
Q

cysts

A

dormant spores.
asexual zoospores form dormant cysts. cysts germinate to produce another diploid phase body
sexual zoospores? cysts germinate to form a haploid generation spores released from the haploid phase are gametes

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31
Q

coenocytic

A

lacking partition walls in a filament or hyphen

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32
Q

zygosporangium

A

in Zygomycota, two different genetic mating types find each other and form gammatangia that then fuse into a zygosporangium

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33
Q

zygospore

A

in Zygomycota, haploid nuclei from the different mating types fuse or undergo karyogamy in the zygosporangium to form a large zygospore which often forms a large warty surface dormant spore

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34
Q

mycorrhizae

A

in Glomeromycota, close symbiotic relationships involving fungi and plant roots. mycorrhizae are associated with the vast majority of plants

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35
Q

vesicular arbuscular mycorrhizae (VAM)

A

the type of mycorrhizae formed by fungi of the glomeromycota

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36
Q

vesicle

A

in Glomeromycota, stores lipids (energy) for fungus

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37
Q

arbuscule

A

in Glomeromycota, highly branched hypha inside root cell of plant. symbiotic exchange nutrients with the plant and acquire sugars from the plant.

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38
Q

distinguishing features and evolutionary origins of ascomycota

A

fourth branch of fungi.

ascus!!!

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39
Q

life cycle stages and structures of ascomycota

  1. how are spores discharged?
  2. sexual vs asexual
  3. steps (4)
A

-spores are discharged from sporocarps passively and actively by wind, hydrostatic pressure and force of a raindrop hitting sporocarp
noted for producing large multicellular structures from coordinated assembly of their hyphae during the sexual phase of their life (sporocarp)
asexual spore production happens during haploid monokaryotic phase
haploid dikaryotic phase- two genetic mating types join their protoplast during plasmogamy
1. after plasmogomy, two haploid nuclei of compatible and different mating types come together fuse and karyogamy to form a diploid nucleus
2. the diploid nucleus undergoes meiosis to form haploid sexual spores
3. the meiotic division which forms four ascospores is followed by a mitotic division to produce eight ascospores, in brewers yeast, only form 4 spores
1. haploid dikaryotic in plasmogamy
2. karyogamy to diploid nucleus
3. meiosis to 4 haploid sexual spores
4. mitotic division 8 ascospores

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40
Q

examples of ascomycota

A

common brewers or baking yeast, ergot fungus- develops perithecium parasitic to cereal crops (ergot disease)- grows on flowers, black truffle- cleistothecium

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41
Q

life cycle stages and structures of basidioimycota

4

A

producing large multicellular structures from coordinated assembly of their hyphae during the sexual phase of their life (sporocarp)
haploid monokaryotic and haploid dikaryotic
mushroom is haploid and dikaryotic development of basidium, sterigma and basidiospores
a - after karyogamy (the zygote 2n nucleus)
b - after meiosis producing 4 haploid nuclei
c - development of the sterigma and protoplasts to receive the haploid nuclei
d – migration of the 4 haploid nuclei into the external basidiospores

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42
Q

ascocarp

A

– the ascospore-bearing, multicellular sporocarp of Ascomycota (mushrooms)

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43
Q

ascus

A
  • the “sac” with ascospores Plural - asci

distinguishing feature of ascomycota

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44
Q

apothecium

A

a fertile region on an ascocarp where the ascii are not covered by sterile fungal tissue at maturity
the asci that contain the spores are open freely to the outside environment as they mature and release their spores

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45
Q

perithecium

A

a type of fertile region on an ascocarp. a closed structure on the ascocarp where the asci are surrounded and enclosed by sterile mycelial tissue
the sterile wall has a regular means of opening with a slit or pore

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46
Q

cleistothecium

A

a type of fertile structure, characterized by having sterile tissue that completely encloses the ascii inside but in this case there is no opening that allows the spores to be released to the outside

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47
Q

basidiocarp

A

a sporocarp produced by a member of the Basidiomycota and which bears basidiosores (mushrooms)

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48
Q

distinguishing features and evolutionary origins of basidiomycota

A

fifth branch of fungi. sister group with ascomycota- form mushrooms.
2nd largest phylum
1. BASIDIUM!!!

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49
Q

sporocarp

A

A multicellular body or structure that produces and contains spores. “sporo” = spore; “carp” = fruit… “spore-fruit”

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50
Q

basidiospore

A

basidium produces 4 haploid spores, produced on outside of spore bearing structure, held up by sterigma

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51
Q

Basidium

A

a cell in which karyogamy and meiosis take place and which bears external spores, the basidiospores, of sexual origin

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52
Q

sterigma

A

the spike-like structure on the basidium that supports the external basidiospore

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53
Q

clamp connection

A

growing haploid dikaryotic hyphae develops clamp connection
clamp branch forms and the two different nuclei when undergoing mitosis distribute themselves on each side of the clamp with one nucleus being returned backwards to ensure that each cell receives one of each type of nucleus as they are added

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54
Q

gilled fungi

A

basidia form on surface of gills underneath cap to develop basidiospores

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55
Q

fairy ring

A

sporocarps of gill fungi on occasion grow in large rings across the soil surface, defines the outer margin of the growing mycelium in the soil

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56
Q

inky cap fungi

A

type of gilled fungi- inky slime that helps to shed off outer parts of the cap that already have released their spores to the air allowing the basidia towards the center to have a greater chance of dispersal

57
Q

polypore fungi

A

basidia develop inside the pores and release their spores down the tube that makes the pore polypore fungi include those that infect trees and produce shelf-like basidiocarps on the side of the tree

58
Q

bracket fungi

A

type of polypore- some bracket fungi grow their mycelia into already damaged and dead parts of the tree trunks and live as saprotrophs but others are parasitic growing their hyphae and mycelium into the living tissue of the tree and become pathogenic and damaging to the tree

59
Q

puffballs

A

at maturity release their spores through open slits or pores on the top after something agitates the structure

60
Q

jelly fungi

A

no gills or pores. a durable gelatinous or jelly-like mass these structures can desiccate during dry periods and then reconstitute after wet periods and continue to produce new basidia and release spores from their surface the hyphae that make up the basidiocarp and the jelly fungi do not have rigid walls

61
Q

rust disease

A

rust fungi damage cereal crops the little rust looking pustules on the surfaces of infected plants are asexual spore structures that spread the pathogen throughout the field during the main growing period
life cycle has wintering phase on secondary host
barberry- secondary host for wheat, campaign to eradicate this

62
Q

examples of basidiomycota

A

gilled, inky cap, polypore, bracket, puffballs, jelly, rust fungi

63
Q

protoplasm/ cytoplasm

A

everything inside the cell excluding the outer wall

64
Q

cytosol

A

the fluid mass that surrounds and provides a home for the organelles

65
Q

plasma membrane (3)

A

1) Regulate passage of molecules
2) Divide the cell into numerous specialized compartments
3) Act as surfaces that hold enzymes for metabolism

66
Q

endoplasmic reticulum (smooth and rough)

A

– a system of narrow tubes and sheets of
membrane that form a network throughout the cytoplasm.
Rough ER – ribosomes attached, involved in protein synthesis
Smooth ER – no ribosomes attached, involved in lipid synthesis

67
Q

central vacuole

A

membrane bound (tonoplast) space in plant cells which stores material, either dissolved in water or as a crystalline mass, 85% of cell volume

68
Q

tonoplast

A

membrane surrounding central vacuole

69
Q

cell wall (primary and secondary)

A

Primary cell wall – thin, cellulose microfibrils
and other polysaccharides (pectins, hemicelluloses)
Secondary cell wall – thick, includes cellulose microfibrils, other polysaccharides and also is cemented together with lignin

70
Q

cellulose

A

A structural polysaccharide found in the cell walls of plants.

  • polymers of glucose,
  • arranged in bundles called microfibrils in cell walls
  • a component of all primary and secondary cell walls
71
Q

lignin

A

a complex branched polymer that impregnates
the cellulose microfibril network only in secondary cell walls
making the tissues stronger, water proof and more
resistant to attack by fungi, bacteria and animals

72
Q

parenchyma

A

Thin primary walls. Typically alive at maturity. Many

functions. water storage cells

73
Q

chlorenchyma

A

photosynthetic parenchyma cells (chlorophyll)

74
Q

collenchyma

A

Unevenly thickened primary walls. Typically alive at

maturity. Provide plastic support. allows plant to bend

75
Q

scelerenchyma

A

Primary and secondary walls. Often dead at maturity.

Provide elastic support and some are involved in water transport.

76
Q

sclereids type of sclerenchyma cell

A

(mechanical) – isodiametric, often dead at maturity

77
Q

fibers type of sclerenchyma cell

A

(mechanical) – long, mostly dead at maturity

78
Q

tracheids type of sclerenchyma cell

A

(conducting) – long and narrow with tapered ends, dead at maturity, no perforations, all vascular plants, have lignin and secondary cell walls

79
Q

vessel elements type of sclerenchyma cell

A

(conducting) – short and wide with perforations at ends, dead at maturity, found almost exclusively in flowering plants, have lignin and secondary cell walls

80
Q

Meristems (apical and lateral)

A

– Region of specialized cells that undergo cell
division
give rise to:
apical- primary plant body, leaves
lateral- secondary plant body, wood and bark

81
Q

Node, internode, axillary bud, leaf

A

Node – point of leaf attachment on stem
Internode – portion of stem between nodes
Axillary bud – dormant shoot at node with dormant apical meristem
Leaf (next week!)

82
Q

Primary plant body

A

growth from shoot and root apical meristems (tips of
roots and shoots)
• primary tissues: epidermis, cortex, pith and primary
vascular tissues
• constitutes the herbaceous parts of the plant

83
Q

Secondary plant body

A

growth from lateral meristems
• secondary tissues: wood, bark
• constitutes the woody, bark-covered parts of plants

84
Q

modular growth

A

the same set of parts is produced over and over with modifications to make up the large complex features we see in all plant shoots for node, internode, axillary bud and leaf

85
Q

Shoot system- plant organ system, reproductive vs vegetative

A 
• Reproductive
flowers
fruits
• Vegetative
leaf (petiole, blade)
stem (node, internode)
86
Q

Root system- plant organ system

A
  • Tap root

* Branch root

87
Q

epidermis (cuticle, stomata, guard cells, trichomes)

A
  • epidermis- outer layer
  • waxy cuticle to prevent drying
  • stomata for exchange of gases
  • guard cells open or close stomata pore
  • trichomes hairs that can be used for protection, reduce wind speeds, reduce water loss
88
Q

pith

A

composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant.

89
Q

cortex

A

outer layer of a stem or root in a plant, lying below the epidermis but outside the vascular bundles

90
Q

vascular bundles (xylem, vessel elements, pits, perforation plates, phloem, sieve elements, companion cells)

A

xylem- water transport
phloem- sugar transport
pits- allow water to flow
vessel elements- conduct water from soil through roots up to leaves
companion cells- genetic information that directs operation c-cells
sieve elements- the specialized parenchyma cells that conduct the sugary mix of fluid throughout the plant attached to companion cells
perforation plates- end wall of vessel element

91
Q

leaf functions (5)

A

1) Photosynthesis (foliage leaves)
2) Protection
3) Support
4) Storage
5) Nitrogen acquisition (insect trapping)

92
Q

blade

A

leaf, capture light from photosynthesis

93
Q

petiole

A

attaches blade to the stem

94
Q

simple leaf

A

no complete divisions into smaller sections called leaflets

95
Q

compound leaf (pinnate, palmate)

A

leaf blade divided into smaller units- leaflets
pinnate- sections of rachis between the leaflets
palmate- leaflets stemed from one section, like a hand

96
Q

leaflet

A

leaflets are sections of the blade divided

97
Q

rachis

A

stemlike section between leaflets

98
Q

mesophyll, palisade parenchyma, spongy parenchyma in eudicot leaf

A

mesophyll- middle leaf, chlorenchyma, many air gaps for CO2 to diffuse
palisade parenchyma- defensive, direct light down through top of leaf for better light penetration (upper layer)
spongy parenchyma- helps CO2 move in the leaf to get to cells, stomates on bottom of leaf (lower layer)

99
Q

leaf veins (vascular bundles of xylem and phloem)

A

monocot- parallel, eudicot- reticulated

100
Q

bud scales

A

protection, reduce frost, surround bud, specialized leaves

101
Q

spines

A

protection, dead at maturity, made from sclerenchyma, modified leaves

102
Q

leaf tendrils

A

support, 3 leaflets are tendrils without a blade, and grab onto a supporting structure

103
Q

taproot

A

the single main root formed in the embryo in a seed and are retained in many eudicots to become the main and largest root of the plant

104
Q

lateral root

A

emerge on the sides of downward growing tap roots or other dominant roots and typically function to spread the absorbing surfaces of the root system outward to increase the volume of soil occupied for uptake of water and nutrients

105
Q

fibrous root system

A

usually found in monocots, dividing small roots of about the same size that serve to intensively exploit soil resources

106
Q

root hairs

A

specialized elongated cells, these single-celled structures which are part of the epidermis serve to increase the absorptive area of the root and absorb water and nutrients from smaller pores in the soil

107
Q

root cap

A

serves to absorb the frictional damage of the growing root tip as it expands through the soil pushed by the elongating cells behind the meristem

108
Q

endodermis

A

specialized tissue surrounding the xylem and phloem and undifferentiated cells. protective layer of tissue formed outside the pericycle in primary roots. tissue forces absorbed water and dissolved ions through living cells and their semi-permeable membranes before arriving at the root xylem.

109
Q

pericycle

A

tissue gives rise to new lateral roots, forming apical meristem

110
Q

casparian strip

A

waxy structures on cell walls, part of endodermis, forces water and dissolved nutrients to pass through endodermis, preventing chemical ions getting into the plant

111
Q

prop roots

A

specialized roots, above ground sections and stems, stabilize and add support to a plant on shifting or unstable surfaces, tropical

112
Q

buttress roots

A

fig tree, platelike roots fuse to from thickened support structures for stability to heavy tropical trees

113
Q

storage roots

A

radish, carrot, sweet potato. modified and used to store starch and sugars

114
Q

primary growth of stem

A

eudicot- vascular bundles form a ring, monocot- vascular bundles don’t form a ring
xylem forms- inside direction of stem, pholem- outside

115
Q

secondary growth of stem

A

secondary xylem to form wood

116
Q

vascular cambium

A

meristematic cells, divides to produce secondary xylem

117
Q

stolon

A

horizontal spread, above ground

118
Q

secondary growth of stem

A

pro: adds capacity for transporting water and sugar
con: wood and bark are expensive for energy and nutrient resources

119
Q

tuber

A

storage, short & fleshy horizontal stem (like potato)

120
Q

cork cambium

A

secondary tissue, develops outside the phloem from cell divisions of another lateral meristem, bark

121
Q

wood (secondary xylem)

A

dominant mass of woody stem

122
Q

secondary phloem

A

outer margin of stem, lateral cell divisions

123
Q

early wood

A

larger cells, thinner walls, produced early in the season, images have bigger holes

124
Q

late wood

A

added in the fall are densely packed with small widths and thick cell walls, smaller cells, images have smaller holes. very thin layer in diffuse porous

125
Q

bark

A

everything outside of vascular cambium

126
Q

cork

A

outer bark

127
Q

stolon

A

stem modification, horizontal spread, above ground

128
Q

rhizome

A

stem modification, horizontal spread, winter survival, below ground

129
Q

tuber

A

modified stem, storage, short & fleshy horizontal stem (like potato), the eyes of potatoes are nodes

130
Q

thorn

A

modified stem, protection, sharp-pointed short shoots, protection of stems against herbivores, whole stems from axillary buds

131
Q

bulb

A

modified stem, storage, below ground, short vertical stem, fleshy leaves

132
Q

corm

A

modified stem, storage, below ground, vertical fleshy stem, papery leaves, winter survival

133
Q

lenticels

A

modified stem, appearance of slits, wart-like or depressions, aid in gas exchange on stem (wood),

134
Q

hyphae that forms sporocarps in Ascomycota

A

haploid and dikaryotic

135
Q

hyphae that forms sporocarps in Basidomycota

A

haploid and dikaryotic

136
Q

chromoplast

A

type of plastid found in cells of flowers and fruits that functions to hold colorful red and yellow pigments for attracting animals

137
Q

mitochondria and chloroplasts have extensive internal membrane networks with associated enzymes attached to membrane surfaces. enzymes are positioned in this way onto these membranes

A

to optimize sequences of enzyme reactions

138
Q

diffuse porous and ring porous

A

Ring-porous species have considerably larger pores in earlywood than in latewood of the previous and the same growth ring. Diffuse-porous species have vessels of approximately the same diameter throughout the growth ring.
both in angiosperms

Plant and Fungal Biology (2 decks)

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