Biology, Eighth Edition (Raven)

Chapter 32: Overview of Animal Diversity

Post Test

1
Multicellularity is a defining feature of the animal kingdom. However a type of multicellularity is found in the cellular slime mold, Dictyostelium discoideum. This occurs through aggregation of individual cells to form a simple, but true, multicellular organism. In animals multicellularity occurs through mitosis of the zygote. What is the main reason why the type of multicellularity in slime molds is not widespread? (p .622)
A)It does not allow cell specialization to occur.
B)It is a very complicated process.
C)The cells are not genetically identical as they are in the animals.
D)The size of the organism will be limited.
E)It is impossible to say.
2
The following are the defining features of protostomes: (p. 627)
A)radial cleavage/ indeterminate development/blastopore forms anus/coelom from invagination of archenteron
B)spiral cleavage/determinate development/blastopore forms mouth/coelom from mesodermal split
C)radial cleavage/determinate development/blastopore forms mouth/coelom from mesodermal split
D)spiral cleavage/determinate development/blastopore forms anus/coelom from mesodermal split
E)spiral cleavage/indeterminate development/blastopore forms anus/coelom from mesodermal split
3
Traditionally the animal phyla were grouped together level of organization or grade. These grades are: (p. 628)
A)tissues/symmetry/embryonic development
B)tissues/symmetry/number of layers of tissue/coelom type
C)tissues/symmetry/number of layers of tissue/embryonic development
D)tissues/symmetry/number of layers of tissue/coelom type/embryonic development
E)symmetry/number of layers of tissue/embryonic development
4
Recent molecular data has led to a revision of the traditional classification of animal phyla. It is particularly valuable in elucidating the relationship of enigmatic taxa because their morphological characters often show: (p. 628)
A)convergent evolution.
B)loss and simplification of structures.
C)both a and b
D)flaws.
5
In the Cambrian period there was a great diversification of animal life. Which hypothesis about the origin of this diversity is the most strongly supported? (p. 632)
A)the emergence of predatory lifestyles
B)geological and environmental factors such as the increase in dissolved oxygen in the oceans
C)the evolution of the Hox developmental gene complex which can produce rapid changes in body plan
D)they are all plausible
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe

Please read our Terms of Use and Privacy Notice before you explore our Web site. To report a technical problem with this Web site, please contact the Web Producer.