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Bio203 exam 2

what is the function of cuticle

allows for water retention and provides resistance to UV light

Cons of cuticle in early land plants

blocked exchange of gases

stomata function

prevents water loss

function of vascular tissues in plants

move water and nutrients up from soil to rest of the plant

in what organism did vascular tissues first appear

club mosses then pteridophyta

what is the synapomorphie for porifera

multicelluar; contains spicule or spongin

cnidarian synapomorphie

true tissues; diploblastic

mollusca synapomorphie

mantle tissue

annelida synapomorphie

segmented body

nematoda synapomorphie

round bodied and protostome developmented

platyhelminthes synapomorphie

flat body and prostome development

arthropod synapomorphie

segmented joints; ecdysis

echinodermata synapomoprhie

spiny skin and deutersome development

chordata syn.

single nerve cord and deuterstome development

hepaticophyta syn.

lack vascular tissues and stomata

bryophyta syn.

secrete cuticle and have stomata

lycopodiophyta syn.

single vein of vascular tissue

pteridophyta syn.

seedless vascular plants

gymnosperm syn.

seeds and pollen

anthophyta syn.

flowering and fruiting bodies

cytridmycota syn.

swimming spores with single posterior flagella

zygomycota syn.

zygospores

glomeromycota syn.

mychorizae

xylem function

main conducting tissue for water and minerals absorbed by roots

vascular cambium function

produces secondary xylem and phloem; formation of wood and inner bark

phloem function

conducting photosynthesis

sieve tube member characteristics

contain callose, aids in wound repair

parts of xylem

tracheids, vessels, and rays

tracheid

dead at maturity, long tubes composed of vessel elements

cork cambium

periderm replacing epidermis results in formation of outer bark

cork

protective tissue to outside cork cambium

tap roots

primary root, gives rise to root hairs

fibrous roots

every root is primary

root hairs

extenstions of a single epidermal cell

how are non-woody plants overall supported

turgor pressure

parenchyma cells

protection of outer layer

collenchyma cells

thickened primary cell wall

sclerychyma cells

made of lignin structure and water transport

dermal tissue

protection outside

vascular tissue

transport of nutrients

shoot apical meristem

protected by young leaves at shoot tip; produces leaf and bud primordia

root apical meristem

located at tip of root and occurs in younger plants

primary growth

forms epidermis, ground and vascular bundles

pro cambium

gives rise to vascular bundles

pro dermin

gives rise to epidermis

key differences between heartwood and sapwood

heartwood is non conducting

what is secondary growth

make woody plants rigid and resistant to decay and involves and increase in width

what plants do true secondary growth

all seed plants except manocots

tegument function in parasites

forms protective barrier

what organisms use intracellular digestion

unicellular eukaryotes and sponges

limitation of intracellular digestion

small particles can be phagocytized

benefits of digestive system with 2 openings

can consume more prey at once, more processing area

specialization in mammalian herbivores: gut

elongated hindgut, rumen

reticulum

receives smaller material for breakdown

omasum

absorbance of fatty acids

ceacum in non-ruminants

site of bacterial fermantation

what is gut morphology dependent on

prey type

how to increase rate of diffusion with ficks law

increase A, decrease D, increase P

countercurrent exchange

decrease oxygen inside relative to oxygen outside

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