Many plants increase in freezing tolerance upon exposure to low nonfreezing temperatures. Rye, for instance, is killed by freezing at about -5°C, but after a period of exposure to low nonfreezing...

Extracted text: Many plants increase in freezing tolerance upon exposure to low nonfreezing temperatures. Rye, for instance, is killed by freezing at about -5°C, but after a period of exposure to low nonfreezing temperature can survive freezing down to about -30°C. When exposed to low temperatures, plants exhibit an increased expression of certain cold-induced genes that function to stabilize cell membranes against freeze-induced injury. The ability of an individual plant to develop freezing tolerance is best described as an example of: Genetic drift OMutation O Allopatric speciation OAdaptation Acclimation Freeze-induced cellular dehydration