UNIT& 9A - Invertebrates, Sponges, and Cnidarians

The main shape of a jellyfish can be classified as:

• Polyp

• Nerve net

• Medusa

• Nematocyst

Water and waste exit a sponge through its:

• Ostia

• Nematocysts

• Osculum

• Mouth

The basic structure of the coral organism is:

• Polyp

• Medusa

• Nematocyst

• Cnidoblast

The stinging cells of a jellyfish are called:

• Cnidoblast

• Cilia

• Nematocysts

• Zooxanthellae

Animals that do not have backbones are

• echinoderms

• cnidarians

• invertebrates

• mammals

An invertebrate with stinging cells and a central body cavity

• mollusks

• cnidarian

• segmented worm

• sponge

An animal with a soft, unsegmented body often protected by a hard shell:

• mollusk

• cnidarian

• sponge

• segmented worm

An asymmetrical animal without tissues or organs:

• SpongeBob SquarePants

• sponge

• roundworm

• cnidarian

Hard outer covering is called an:

• endoskeleton

• exoskeleton

• skeleton

• bones

An internal skeleton is called an:

• endoskeleton

• exoskeleton

• skeleton

• bones