Increasing population density on marginal lands in rural areas has resulted in desertification, which reduces the ability of the land to sustain the population
Indicate whether the statement is true or false
TRUE
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Which weather pattern is characteristic of a La Niña event?
a. high pressure over the western Pacific b. high ocean surface temperatures c. warm and dry weather in the southern U.S. d. ocean surface waters moving from west to east e. air movement from west to east
Cells nearest the source of a morphogen are exposed to a high concentration of morphogen and express one set of genes. Cells farther from the source of the morphogen are exposed to a lower morphogen concentration, and express different genes. This is a description of which developmental process?
a. embryonic induction b. fertilization c. apoptosis d. cleavage e. gastrulation
Four of the five answers listed below are
characteristics of ethylene. Select the EXCEPTION.
a. a source is aging plant tissues b. promotes fruit ripening c. triggers cells division d. is a gas e. inhibits cell elongation
The rate of transpiration, the flow of water through the stem, and leaf water potential are measured in a tree during a 24-hour period under normal environmental conditions. The results from these measurements are shown in the graphs below. (There is an image in your packet #97-100) 2002 test All of the following changes would be likely to decrease the rate of transpiration at 8 A.M. EXCEPT
(A) causing the stomata to close (B) increasing the humidity of the atmosphere (C) increasing the water potential of the atmosphere (D) increasing the water potential of the soil (E) placing the plant in total darkness