BIO chapter 28 :(

Which class is also called "flower animals"? A. Anthozoa B. Cubozoa C. Hydrozoa D. Scyphozoa

a. Anthozoa.

How does a sponge reproduce asexually? A. budding B. gemmules C. fragmentation D. all of these

a. Budding.

While exploring, you discover a hydrozoan called Hydra sp. Where did you find the Hydra sp.? A. pond C. coral reef B. ocean D. brackish water

a. Pond.

Which of the following statements about sponges is NOT true? A. they produce both eggs and sperm B. they are filter-feeding invertebrates C. their skeletal structure consists of spicules and/or spongin D. they have mesoglea between the epidermis and endodermis

a. They produce both eggs and sperm.

A medusa is often described as ____. A. an umbrella-shaped body with tentacles that hang down B. a tube-shaped body with a mouth surrounded by tentacles C. a ball-shaped body with many branches D. a porous vase lined with flagellated cells

a. an umbrella-shaped body with tentacles that hang down

While swimming in the ocean, you feel a sting on your leg from a Portuguese man-of-war. The sting was caused by ________. A. nematocysts B. cnidoblasts C. cnidocysts D. nematoblasts

a. nematocysts

True jellyfishes belong to which class of phylum Cnidaria? A. Hydrozoa B. Scyphozoa C. Cubozoa D. Anthozoa

b. Scyphozoa.

The word Porifera comes from a Latin word that means ___________. A. porous B. pore-bearer C. pole-flower D. pore-flower

b. pore-bearer

. Diploblastic animals have which germ layers? A. ectoderm and mesoderm C. ectoderm and endoderm B. mesoderm and endoderm D. mesoderm, ectoderm, and endoderm

c. Ectoderm and endoderm.

Which of the following allows water to enter a sponge? A. mesohyl B. amoebocyte C. ostia D. osculum

c. Ostia.

Cnidarians have ______________ between the epidermis and the gastrodermis. A. polyps B. endodermis C. mesoglea D. nematocysts

c. mesoglea

The central cavity of a sponge , the __________________, is lined with _____________. A. gastrovascular cavity, choanocytes C. spongocoel, choanocytes B. canal system, choanocytes D. osculum, choanocytes

c. spongocoel, choanocytes

Which of the following statements about cnidarians is NOT true? A. they sting their prey with nematocysts on their tentacles B. they have two body forms: medusa and polyps C. they are filter-feeding invertebrates D. they are radially symmetrical

d. They are radially symmetrical.

Which of the following cnidarians exist in a polyp form? A. corals D. all of these B. sea anemones E. A and B only C. jellyfish

e. A and B.

Which of the following is a characteristic of jellyfish? A. radial symmetry B. bilateral symmetry C. incomplete digestive tract D. B and C E. A and C

e. A and C.