A mutually beneficial interaction between a root and a fungus is called ____
a. nitrogen fixation
b. Rhizobium
c. mycorrhiza
d. hyphae
e. root nodules
ANSWER: c
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The plant movement in the above figure is
caused by a. auxin differences in two sides of the coleoptile. b. gibberellin released in one side of the leaf. c. abscisic acid in two sides of the stems. d. salicylic acid in two sides of the roots. e. none of these.
What is the name of the process whereby a platform with many wells is secured to the ocean floor?
A. offshore drilling B. secondary recovery C. underground mining D. geothermal extraction
The salinity of a small inland lake has recently started to increase. Researchers are planning to study the lake over several decades to investigate how freshwater organisms survive significant changes in their natural habitat. Which of the following physiological mechanisms will the researchers most likely observe among the surviving organisms in the lake?
(A) Prokaryotic organisms will use various mechanisms to counteract swelling of cells as a result of increased water uptake. (B) Single-celled organisms will use various mechanisms to counteract the increased flow of water from cells to the environment. (C) Eukaryotic organisms will use various mechanisms to counteract the diffusion of positively charged ions across the cell membrane. (D) Multicellular organisms will use various mechanisms to counteract the loss of cell adhesion as a result of calcium deficiencies.
Disruptive selection occurs when
A. the environment controls which organisms will survive. B. humans determine which organisms will survive. C. the extremes of the population have a lesser chance to survive. D. the extremes of the population have a better chance to survive. E. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.