A study of echinoderm embryos, such as sea stars, confirms a similar developmental pattern to that of vertebrates. In both, the blastopore becomes the anus. This would be considered
A. convergent evolution.
B. analogy.
C. homology.
D. behavioral data.
E. synapomorphy.
Answer: C
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Chromosome number is reduced during meiosis because the process consists of
a. two cell divisions without any chromosome replication. b. a single cell division without any chromosome replication. c. two cell divisions in which half of the chromosomes are destroyed. d. two cell divisions and only a single round of chromosome replication. e. four cell divisions with no chromosome replication.
____ helps defend plants against viral infection
a. Systemin b. Jasmonates c. Brassinosteroids d. Methyl salicylate e. Oligosaccharins
Mycorrhizae associations are
A) very unusual. B) common; at least 80% of the species of plants form these associations. C) common only in nutrient-rich environments. D) absolutely necessary for survival. E) common only to species, such as grasses.
Which term is analogous to the word "niche"?
A. job description B. desires C. address D. needs E. properties