Answer the following questions true (T) or false (F)
1. A flea is considered to be a predator on a dog.
2. The number of prey species is one of several factors determining the number of predators that can live in an area.
3. Parasites usually kill their hosts.
1. FALSE
2. TRUE
3. FALSE
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One major difference between ectomycorrhizae and arbuscular mycorrhizae is
A. ectomycorrhizae are parasitic on plant roots while arbuscular mycorrhizae are not. B. ectomycorrhizae do not penetrate plant roots; arbuscular mycorrhizae penetrate plant roots. C. ectomycorrhizae are more common on plant roots than arbuscular mycorrhizae. D. ectomycorrhizae form mutualisms while arbuscular mycorrhizae are parasitic. E. most ectomycorrhizae are zygomycetes while most endomycorrhizae are basidiomycetes.
The organism in the tropics that replaces limpets in the supralittoral fringe is
a. turtle grass. b. nerites. c. the hermit crab. d. knobby periwinkle. e. the coconut crab.
Karyotyping is useful for determining:a
the number of chromosomes in an individual. b. the presence of recessive traits. c. whether or not a specific gene is missing from a chromosome. d. whether or not gene mutations have occurred. e. the presence of sickle cell anemia.