Explain why decomposers and detritus feeders are so important to ecosystems
What will be an ideal response?
They recycle nutrients to simple molecules that are returned to the abiotic environment for use again by plants and then are passed on to animals, thus maintaining the ecosystem.
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Which of the following is not considered a plant organ?
A. leaf B. stem C. root D. flower E. seed
Allelochemicals are active in preventing
a. herbivore feeding. b. germination of plant competitors. c. infection by pathogens. d. all of the above.
The phospholipid molecules of most membranes
have a. a hydrophobic head and a hydrophilic tail. b. a hydrophobic head and a hydrophobic tail. c. a hydrophobic head and two hydrophobic tails. d. a hydrophilic head and two hydrophobic tails. e. none of these.
Infectious disease and parasites that affect population size are ____
a. carrying capacities b. replacement factors c. density-dependent controls d. density-limiting controls e. density-independent controls