annelids (segmented worms)

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what are three reasons having a segmented body is useful

1. Allows body parts to move independently of each other 2. Allows organisms to digest and move at the same time 3. allows organs to begin to specialize

the digestive track in an earthworm has how many openings?

2

which of the following is/are true about earthworms?

A) Earthworms return nutrients to the soil by decomposing dead organic matter. B) Burrows made by earthworms bring oxygen to plant roots and soil microorganisms D) Earthworms loosen the soil making it easier for roots to grow

do earthworms have specialized respiratory organs?

NO

setae

bristles in the ventral surface that provide traction

annelids have what type of coelom?

coelom

esophagus

connects the mouth and pharynx

Chitin is a tough carbohydrate found in earthworm

cuticle and setae

nephridia

excretory organs

earthworms have internal or external fertilization?

external

nephridia

filter wastes from body fluids

gizzard

grinds food

prostomium

helps dig through the soil

cocoon

holds fertilized eggs until young worms hatch

typhlosole

intestinal ridges increase the surface area for absorption

aortic arches

muscular structure to suck in food

pharynx

muscular structure to suck in food

cuticle

noncellular covering that prevents dehydration and protects

earthworms belong in what class of annelids?

oligochaeta

anus

opening where wastes leave

what class has fleshy projections called parapodia that aid in movement?

polychaetes

ovaries

produce eggs

clitellum

right around the body that makes mucous for reproduction

seminal receptacles store what

semen

clitellum

swollen band around earthworms

crop

temporarily stores food

hermaphrodites are organisms.....

that have both male and female reproductive organs

oligochaetes respire through what?

their moist skin

how do earthworms reproduce?

they are hermaphrodites but don't fertilize their own eggs.

setae has what function?

to aid in movement and gas exchange in some segmented worms.

why do earthworms need to stay moist?

to allow gases to diffuse through their skin

aortic arches

acts as earthworm's heart to pump blood

cerebral ganglia

acts as the earthworm's brain

setae

aid in movement


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