Ch 16a sponges & cnidarians

Which of the following animals has an endoskeleton?

• spiny lobster

• blue eyed darner dragonfly

• black bear

• antler coral

Which of the following animals has an exoskeleton?

• orb spider

• cutthroat trout

• green iguana

• mule deer

What type of body plan does a house cat have?

• bilateral symmetry

• radial symmetry

• assymetry

• none of these

Which of the following is not a characteristic of an animal?

• the exchanging of gases with its environment

• having some means of support

• reproducing after its own kind

• being autotrophic

Most animals are what?

• invertebrates

• vertebrates

• both A & B

• neither A nor B

Which of the following is a significant difference between sponges and other animals?

• sponges have an asymmetrical body plan

• sponges have no germ layers

• sponges do not move through their environments

• all of these are differences

Sponges are hermaphroditic, which means that sponges:

• are all male

• are all female

• have both male and female reproductive structures

• none of these

The phylum Cnidaria is named for the cnidocytes found in these organisms. Cnidocytes are specialized _____ cells.

• swimming

• stinging

• feeding

• reproductive

Cnidarians exist in one of two forms, as either a ____ or ____

• polyp, nematocyst

• nematocyst, medusa

• medusa, coral

• medusa, polyp

Animals with radial symmetry can be divided into left and right halves by a line through their center.

• true

• false