Invertebrates

In Phylum Porifera, the opening at the top where water is expelled is the

• mesopyl

• amoebocyte

• osculum

• choanocyte

A stinging cell of Phylum Cnidaria is

• polyp

• nerve net

• medusa

• cnidocyte

Sea anemones, sea pens, and corals belong to what class?

• Anthozoa

• Cubozoa

• Scyphozoa

• Hydrozoa

Earthworms belong to what class of Annelid?

• Oligochaeta

• Caudofoveata

• Scaphopoda

• Polychaeta

Lobsters belong to what subphylum of Arthropod?

• Hexapod

• Myriapoda

• Chelicerata

• Crustacea

Sea cucumbers belong to what class of Echinoderm?

• Ophiuroidea

• Echinoidea

• Crinoidea

• Holothuroidea

The circulatory fluid in an echinoderm is

• blood

• mesophyl

• water

• saline

Annelids have

• pseudocoelom

• true coelom

• no coelom

• none of the above

The alternating body types in a Cnidarian is the umbrella-shaped _ and the sessile _

• polyp; medusa

• medusa; polyp

• mantle; radula

• radula; mantle

A chiton, which as eight plates on the dorsal shell is in what Mollusca class?

• Polyplacophora

• Bivalvia

• Gastropoda

• Cephalopoda