Daniel Janzen of the University of Pennsylvania has emphasized which of the following processes in his explanation of high species richness in tropical systems?
A) herbivory
B) mutualism
C) allelopathy
D) intraspecific competition
Ans: A) herbivory
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Which statement about the phosphorus cycle is true?
a. The natural weathering of rocks sends phosphate into lakes and oceans. b. Phosphate from geothermal vents causes dead zones in lakes. c. Phosphate enters the oceans primarily through precipitation. d. The average phosphate ion resides in the ocean for less than 500 years.
The following are steps involved in abscisic acid's (ABA) role in stomata closure. Arrange them in the correct order of events. a. The resulting voltage change across the guard cell plasma membranes opens gated transport proteins that allow potassium ions to exit the cells
b. ABA binding to its receptor on a guard cell membrane causes the release of nitric oxide (NO). The NO activates calcium transport proteins and an influx of calcium occurs. c. Water follows the solutes by osmosis. d. The guard cells lose turgor and collapse against one another, closing the stoma. e. Calcium influx activates transport proteins that pump negatively charged malate and chloride ions out of the cells. Thus, the overall charge of cytoplasm increases, and the overall charge of extracellular fluid decreases.
Matching. Choose the one most appropriate answer
for each. 1. ___ biological magnification 2. ___ detritus 3. ___ legumes 4. ___ net primary production 5. ___ primary productivity 6. ___ food chain 7. ___ gross primary production A. rate at which energy becomes stored in organic compounds through photosynthesis B. total amount of solar energy stored in organic compounds during photosynthesis C. a straight-line sequence of steps by which chemical bond energy moves to higher trophic levels D. the potential chemical energy remaining (after aerobic respiration by autotrophs) that can be passed on to other trophic levels E. DDT in the environment F. a kind of plant that increases soil nitrogen content G. particles of organic waste products, dead, or partly decomposed tissues
Which plant parts commonly contribute to asexual reproduction?
A) seeds B) roots C) flowers D) fruits