Unformatted text preview: 9. It is impossible to say that all plants are purely r- or K—strategists because many plant species are “r” except they live long and mature slowly.
. r- and K-strategies really only apply to animals like deer and pigs.
0. too many plant species grow too large to be considered “K”.
d. most plant species produce too many offspring to be considered “r”.
e. plants are more sensitive to density dependent factors than animals are. 10. Density dependent factors are said to accelerate the growth of populations
when those populations a. reach too high a level due to a sudden inﬂux of resources. b. display a low level of dispersion but unusually high density.
Q) are recovering from some devastating decline in size. d. are about to transition from the “J” to the “S” shape curve. e. need to increase their ﬁtness to resist an immigrant invasion. 11.Secondary consumers play a vital role in communities because they a. recycle wastes and dead bodies of primary consumers.
b. are the only ones who are essentially 100% energy independent.
c. live in symbiotic harmony with the secondary producers.
eat only the primary producers left behind by primary consumers
(g) prevent deleterious overgrowth of primary consumer populations. 12.A community lacking decomposers and detritus feeders might a. be free to evolve more efﬁcient methods to capture solar energy.
b. simply respond by expanding the population Of primary producers.
q. be poisoned from its own wastes and run short of available nutrients.
. enjoy more resources for all the producers and consumers to share.
e. eventually become composed exclusively of heterotrophs. 13.0ne likely reason that plants have evolved such diverse and effective
arsenals of toxic chemicals is that . they can’t run away from predators but must stay and ‘ﬁght’. being autotrophs, they have abundant energy for creative chemistry. as K-strategists, their long lives allow much time for evolutionary tinkering.
they don't have digestive systems, so are immune to toxic poisoning. we just haven’t gotten around to breeding out most of the toxins. 99.0.:ch ...
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- Spring '08