Chapter 28

Which of the following is not a defining characteristic of animals? (a) heterotrophs (b) multicellular (c) eukaryotic (d) presence of a coelom (e) form a zygote that undergoes cleavage

Which of the following is not an adaptation to terrestrial living? (a) internal fertilization (b) shell surrounding egg (c) adaptations for maintaining body temperature (d) surface for gas exchange deep in body (e) ability to maintain location

The Parazoa (a) are coelomates (b) include cnidarians (c) include all animals with radial symmetry (d) do not form true tissues (e) have a pseudocoelom

Cephalization (a) evolved along with bilateral symmetry (b) is the development of a digestive system (c) is characteristic of cnidarians (d) involves a concentration of excretory organs (e) first evolved in deuterostomes

The germ layer that gives rise to the outer covering of the body and the nervous system is the (a) gastrodermis (b) ectoderm (c) contractile layer (d) endoderm (e) mesoderm

Radial symmetry is characteristic of (a) protostomes (b) acoelomates (c) deuterostomes (d) cnidarians (e) Porifera

A true coelom is completely lined with (a) flagella (b) ectoderm (c) a contractile layer (d) endoderm (e) mesoderm

Protostomes are characterized by (a) spiral cleavage (b) indeterminate cleavage (c) enterocoely (d) radial symmetry (e) a distinctive body plan that includes a pseudocoelom

During cleavage, an animal (a) undergoes metamorphosis (b) becomes a larva (c) undergoes a series of mitotic divisions and becomes a blastula (d) becomes diploid (e) reproduces sexually

Collar cells (choanocytes) are characteristic of phylum (a) Porifera (b) Cnidaria (c) Coelomata (d) Lophotrochozoa (e) Ecdysozoa

Which of the following is an example of a deuterostome? (a) a lophotrochozoan (b) coral (c) chordate (d) planarian (e) a pseudocoelomate

Cnidocytes are (a) characteristic of sponges (b) found among cells lining the gastrovascular cavity (c) contain stinging organelles (d) are lined with mesoderm (e) have two main shapes

The marine hydrozoan Obelia (a) is seen mainly in the medusa form (b) lacks cnidocytes (c) has reproductive polyps that produce eggs and sperm (d) is one of the largest jellyfish known (e) alternates sexual and asexual stages during its life cycle

Ctenophores (a) tend to be sessile (b) have a digestive system with only one opening (c) exhibit bilateral symmetry (d) are characterized by adhesive glue cells on their tentacles (e) are freeswimming polyps