The most commonly accepted theory used to explain movement of fluid through phloem is ____
a. the cohesion-tension theory
b. the pressure flow theory
c. active transport
d. dialysis
e. turgor pressure
ANSWER: b
You might also like to view...
The upper limit of an organism's distribution in the rocky intertidal is usually determined by:
a. grazing effect. b. predation. c. pH. d. desiccation. e. competition.
Four of the five plants listed below are seed bearers
Select the exception. a. ferns b. conifers c. eudicots d. ginkgos e. monocots
Near the poles, what is generally the overriding climate factor?
a. temperature b. precipitation c. latitude d. altitude e. pH
Two communities may have exactly the same number of species, yet one might be measured as having a greater species diversity. What defines species diversity?
A. composition or a listing of the various species in a community B. both the number of species and the evenness or relative abundance of individuals of the different species C. a community and all of the abiotic factors associated with it D. the native species plus the introduced species E. the potential number of species that should exist in a community minus the species that have gone locally extinct