An apparent departure from the rule that species diversity increases toward lower latitudes is the decrease in species of mammals as one moves southward on the peninsula of Baja California. What factor might account for this southward decline?
A) increased intensity of competition
B) increased intensity of predation
C) increased dispersal distance from the continental source of species
Ans: C) increased dispersal distance from the continental source of species
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Which is not true about a crown gall tumor?
A. It is a bacterial infection of plants. B. It requires a plasmid. C. It produces a large amount of opines that neither the plant nor bacteria synthesizes. D. It is due to the incorporation of bacterial plasmid DNA into the plant chromosome. E. All of the choices are true.
The cells that function in phloem are:
a. vessels b. sieve elements c. adjunct cells d. sclereids e. periderm
Which of the following characteristics is
common to bryophytes and to seedless vascular plants?
a. xylem conduction cells b. sporophyte predominant c. gametophyte predominant d. water required for fertilization e. true roots
__________ is responsible for water movement in plants
a. Guttatiion b. Evaporation c. Transpiration d. Photosynthesis e. Cellular respiration