Considering the traditional view of ecological succession, which plant would most likely be a pioneer species in a
primary succession event?
a. an oak tree that produces acorns dispersed by squirrels
b. a snapdragon flower pollinated by bees
c. a dandelion that produces seeds asexually, which are dispersed by the wind
d. a perennial species such as Douglas fir trees
e. a birch tree
ANSWER: c
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Phloem transport of sucrose is often described as going from source to sink. Which of the following is most likely to function as a source?
A) a growing leaf in early spring B) a growing root in late summer C) a bulb in early spring D) a shoot tip in late fall
The first person to describe the mechanism of seafloor spreading by which continents drifted apart from one another was:
a. Sir Francis Bacon. b. Alfred Wegener. c. Harry Hess. d. Edward Suess. e. Charles Darwin.
Which of the following DOES NOT have a major effect on the rate of transpiration?
a. air temperature b. relative humidity c. air movement d. amount of direct solar radiation e. daily fluctuations in atmospheric carbon dioxide concentrations
Microaerophiles are microbes that grow best at low
A. carbon dioxide levels. B. pH values. C. hydrostatic pressure. D. oxygen levels. E. salt concentrations.