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CUA BIOL 341 Ecology Midterm
Ecology, Animal & Plant Kingdom
46
Environmental Studies
Undergraduate 3
11/02/2009

Additional Environmental Studies Flashcards

 


 

Cards

Term
Kingdom Animalia
Definition

1. Multicellular heterotrophs which ingest their food

2. lack rigid cell walls

3. most reproduce sexually, gametes form by meiosis

Term
Porifera (sponges)
Definition

-multicellular

-not organized into tissues or organs

Term
Characteristics of sponges (4)
Definition

-cells embedded in matrix

-chaonocytes & pores allow sponge to filter feed

-anchor to seafloor, beat flagella to draw water in

-some contain spongin

Term
Cnidaria (Jellyfish, sea anemones, hydra)
Definition

radial & bilateral symmetry

specialized tissue

Term
Characteristics of Jellyfish 
Definition

-bell (take water into bell, shoot out, allows swimming)

-ocelli ("eyes")

-touch receptors

-simple nervous system (helps determine position, detect presence of animals)

-mouth

-oral lobes

-tentacles

-eat fish, shrimp, eaten by larger fish, crabs, sea turtles

Term
cnidocytes
Definition

-stinging cells on tentacles & oral lobes

-contain nematocysts - "harpoons" that spear prey, draw harpoon back to cnidocyte

Term
reproduction of jellyfish
Definition

asexual & sexual phases, medusa & polyp

egg->planula->polyp->older disked polyp

-> disk (young medusa) -> medusa

Term
Platyhelminthes (flatworms & tapeworms)
Definition

-internal organs & symmetry

-anterior brain, connected to (at least) one pair of nerve cords

-eyes

-protonephridia

-hermaphroditic

-mouth, larynx, simple gastrovascular cavity

-O2 & CO2 diffuse across body

 

Term
Nematoda (roundworms)
Definition

-pseudocoelem

-perfectly cylindrical body

-move using undulations of body (press against particles

-

Term
Rotifera
Definition

-pseudocoelem

-corona - ciliated surface, cilia beat in waves, gives impression of rotation

-freshwater environ.

Term
Mollusca
Definition

-coelem (completely enclosed in mesoderm)

-specialized tissues

-head

-central sections w/ body's organs, enclosed in mantle (tissue), includes gills

-foot

-tongue-like organ to capture food

Term
Classes of Mollusca (3)
Definition

-Gastropods (snails & slugs) - hard protective shell, use foot to crawl

-Bivalves (clams, oysters, scallops) - 2-part shell w/ hinge

-Cephalopods (octopuses & squids) - no shell, use mantle for jet propulsion

Term
Snails
Definition

-most are coiled

-use foot to move, emit mucus from foot to glide (move more easily)

-head - 2 pairs of tentacles (upper = light vs dark, lower = vibrations)

-pneumostome (respiratory)

-mouth

Term
Snail Mating
Definition

-when ready to mate, move w/ foot raised

-push feet together, insert dart, causes genital pore to come out

-hermaphroditic, insert sperm into each other, eggs fertilized internally, laid 1-2 months later

Term
Octopuses
Definition

-suckers on arms (allows "tasting" of food)

-heart

-kidneys

-gills (work w/ funnel tubes which pull water over gills)

-well developed head, brain, eyes (keen eyesight)

Term
Annelida (WORMIES!)
Definition

-segmentation

-circular & longitudinal muscles

-burrow for food in soil

-earthworms have crop & gizzards

-closed circulatory system

-ventral nerve cord

-breathes through surface of body = moist envrionments!

-taste, touch, sense light through skin

Term
clitellum
Definition

-used in mating in annelids

-secretes mucus layer which brings eggs & sperm together - called egg case

Term
woody plants
Definition

cell walls contain lignin = wood

-show secondary growth

Term
herbaceous plants
Definition

no lignin

no secondary growth

stems & leaves die @ end of growing season

Term
annuals
Definition

herbaceous

go from seed to seed in less than 1 yr

ex. corn, marigolds, geraniums

Term
biennials
Definition

herbaceous

2 yr life cycle

yr 1 - roots, basal rosette

yr 2 - stem & flower produced

after seeds produced, plants die

ex. carrots, lettuce

Term
perennials
Definition

may be herbaceous or woody

flower repeatedly over many yrs

above ground leaves/stems of herb. plants die every yr

 

Term
vascular plants
Definition
contain root system & shoot system (stems, leaves, flower & fruits)
Term
roots
Definition

1. anchor/give support

2. absorb nutrients

3. produce growth hormones

Term
stems
Definition

1. support leaves, allow as much light exposure as possible

2. support vascular bundles

3. store water/food

Term
ground tissue system
Definition

photosynthesis, storage & support

contains parenchyma, collenchyma & sclerenchyma cells

Term
parenchyma cells
Definition

comprised of cellulose

thin cell walls

water/food storage, photosynthesis

Term
collenchyma cells
Definition

primary cell wall

secondary cell wall made of pectin

support tissue

Term
sclerenchyma cells
Definition

primary cell walls

secondary cell walls - made of cellulose & lignin

Term
vascular tissue system
Definition

xylem - transports water, made of tracheids (long hollow "pipes") & vessels

phloem - transports carbs, made of seive tube members

Term
dermal tissue system
Definition

protects plant

restricts water loss

cuticle - waxy layer to prevent water loss

 

Term
stomata
Definition

 - opening in cuticle that permit passage of gas & water

-surrounded/regulated by guard cells

-usually open during day, but can be closed based on conditions

-when open, CO2 diffuses IN, H2O diffuses OUT

Term
Meristematic tissue
Definition

responsible for growth of vascular plants

clusters of actively dividing, undifferentiated cells, which produce new cells

Term
apical meristems
Definition

produce primary growth - tips & roots of stems

ex. buds, leaf elongation, etc.

Term
lateral meristems
Definition

produce secondary growth

increases diameter of roots 7 stems

Term
primary growth
Definition

apical meristem -> primary meristems

1. protoderm - epidermis

2. ground meristem - parenchyma cells of cortex (chloroplasts!) & pith

3. procambium - differentiate into xylem & phloem, undiff. = vascular cambium

 

Term
secondary growth
Definition
results from activity of vascular cambium ->divides into xylem & phloem - single layer of each for each year = rings on trees!
Term
movement of water in plants
Definition

water is required for:

1. enzymatic reactions

2. photosynthetic cells must be moist to allow CO2 entry

3. maintains rigidity

Term
water potential
Definition

ability of water to move

 described by Ψ (Psi)

measured in MPA = Pa x 106

influenced by pulling forces of soil, solute, etc.

flows from HIGH (less negative) to LOW(more negative)

Term
transpiration
Definition

driving force behind movement of water

-loss of water from internal atmosphere via stomata

-when open stomata, water pulled up stem, big difference btwn amt of water in leaf vs outside of leaf = strong diffusion of water OUT of leaf

Term
pull of water depends on:
Definition

1. sufficient sunlight for transpiration

2. moisture availability in soil

3. cohesion

4. adhesion

Term
matric potential
Definition

tendency of water to stick to soil surfaces

dependent on soil texture

Term
photosynthesis
Definition

the process of turning solar energy into the chemical energy of sugar and other plant molecules

-occurs in chloroplasts in mesophyll

chlorophyll a is directly involved in conversion of solar->chemical energy

Term
C3 Photosynthesis
Definition

1. light-dependent:absorbs sunlight energy, convert to NADPH & ATP, water is split, release O2 (includes photosystem I & II, ETC) - carried out in mesophyll

2. light-independent: CO2 converted to sugar - uses ATP & NADPH (Calvin cycle) - occurs in stroma

Term
C4 photosynthesis
Definition

CO2 entering leaf first converted to 4-C sugar before enters Calvin cycle

occurs in bundle-sheath cells

 

advantageous in hot regions w/ intense sunlight

Term
Crassulacean Acid Metabolism (CAM)
Definition

occur in mesophyll cells

open stoma at night to capture CO2, but close while Calivin cycle is occurring

prevalent in desert plants

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