Post Worm lab

A coelom lined by mesoderm and endoderm?

• a true coelom, found in nematodes

• a true coelom, found in annelids

• a pseudocoelom found in nematodes

• a pseudocoelom found in annelids

Hydrostatic skeleton

• found in both nematodes and annelids

• found in only nematodes but not annelids

• found in only annelids but not nematodes

• none of these

The layers of the body wall from the outside inward

• muscle fibers, cuticle, epidermis

• epidermis, cuticle, muscle fibers

• cuticle, muscle fibers, epidermis

• cuticle, epidermis, muscle fibers

Cuticle, sucking lips, extensive reproductive system are all nematode adaptations for

• an aquatic life

• a parasitic life

• a terrestrial life

• none of these

A significant advantage of the Ascaris (nematode) having two separate openings to the digestive tract

• allows specialized regions to develop along the length of the gut

• food and waste don't mix

• Nematodes don't have two openings, they have a single, blind sac gut.

• none of these

What are the advantages of a body cavity being present in an animal? Select all that apply

• provides space where organs and organ systems can develop

• fluid in the cavity can be used to collect waste and circulate nutrients

• can provide hydrostatic support

• none of these are an advantage.

What type of symmetry to annelids have?

• radial

• bilateral

• asymmetry

• multi-symmetry

In an annelid without gills or lungs, how does gas exchange occur?

• It doesn't

• through the skin

• through the nephridia

• none of these

The clitellum (select all that apply)

• is closer to the mouth than the anus

• secretes mucus ( a cocoon that holds the eggs) for reproduction

• is a swollen band

• secretes wastes and contains the ganglia

Annelids have a

• closed circulatory system

• open circulatory system

• no circulation, all exchange is by diffusion

• none of these