Animal Phyla 1

What type of symmetry do Porifera have?

• Asymmetrical

• Radial

• Bilateral

• Biradial

What is the outer layer of a sponge composed of?

• Pinacocytes

• Amebocytes

• Choancytes

• Spongocoel

Which one of the following cell types is not found in sponges?

• Neurons

• Epidermal cells

• Amoebocytes

• Choanocytes

Sponge skeletons may consist of microscopic needlelike spikes called ______.

• Tests

• Valves

• Spongin

• Spicules

The following are characteristics of Phylum Porifera except for:

• Sponges are monoecious. Thus, they go through asexual and sexual reproduction.

• Sponges feed through filtration and get rid of wastes through diffusion.

• Sponges have tissue-level of organization.

• Sponges have remarkable powers of regrowing missing parts.

Phylum Cnidaria has _______ organization of tissue layer.

• Cytoplasmic

• Diploblastic

• Triploblastic

• Some are diploblastic and some are triploblastic.

The specialized cells of Phylum Cnidaria that help in feeding, defense, and attachment.

• Cnidocytes

• Pinacocytes

• Choanocytes

• Porocytes

Many cnidarians have two distinct life stages (or body styles) called

• the gametophyte and the sporophyte

• egg and adult

• the polyp and the medusa

• egg and larva

Which of the following statements is NOT true about Cnidarians?

• A medusa is the sessile form of a cnidarian.

• Cnidarians can reproduce sexually.

• A cnidarian uses its tentacles to capture food.

• Corals and hydras are examples of cnidarians.

Which of the following is a characteristic associated ONLY with cnidarians?

• Pores

• Tentacles with stinging cells

• Parasitic life cycle

• Choanocytes containing nematocysts