21. The most common type of symmetries found in animals are:
a) Asymmetrical and radial
b) Bilateral and radial
c) Bilateral and biradial
d) Biradial and radial
22. Acoelomates such as flatworms move food through their digestive system using the following mechanism:
a) Stomach muscles
b) Anal contractions
c) Compression of the body
d) Secretion
23. Roundworms are:
a) Coelomates
b) Aceolomates
c) Pseudocoelomates
d) Non of the above are correct
24. The organs of acoelomates are located in the body in following manner:
a) Acoelomates are lacking organs
b) In a single body cavity
c) In several body cavities
d) Embedded within other tissues
25. Which of the following is not a characteristic of the Porifera?
a) Channel like openings throughout the body
b) Collar cells
c) Vase shaped body
d) Organs
26. An organism that contains both male and female gonads is called:
a) Bisexual
b) A hermaphrodite
c) Dioecious
d) Asexual
27. Feeding in sponges is facilitated by:
a) Collar cells
b) Muscle cells
c) Tentacles
d) Suckers
28. Sponges are able to disperse their young because:
a) The adults deposit the young away from where they mated
b) They produce a swimming larval stage
c) The young crawl before fall to the bottom
d) The fertilized eggs float for miles
29. Cnidarians are characterized by the following feature:
a) Stinging cells
b) Keen vision
c) A large brain
d) Complex organ systems
30. How do tapeworms obtain their food?
a) By taking in nutrients in their anus
b) Through a digestive system
c) By autotrophic methods
d) By absorbing nutrients through their epidermis
