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I'm sorry these are so many questions, but your help wouldbevery much appreciated, because being in
all honors classes plus this extra work is too much for me,soif you could, please help me. Thank you.
1. Which of the following can be considered a contribution toadensity-dependent regulation of populations?
A.predation           B.intraspecific competition of nutrients   C. theaccumulation of toxic wastes
D. none of the above      E. A,B, andC are correct
2. The carrying capacity (K) of an environment
A. is always eventually reached in any population
B. is usually determined by energy limitation
C. differs among species, but not within them
D. is calculated as the product of annual per capitabirth rate(r)
E. remains the same in the presence ofdensity-dependentpopulation regulation
3. To measure the population density of grasshoppersoccupyinga soccer field, 100 grasshoppers are captured,marked with a reddot, and then released. The next day,another 100 grasshoppers arecaptured, including the recapture of20 marked grasshoppers. Onewould correctly estimate thepopulation to be
A. 200       B.500    C. 1,000    D.10,000    E. 900,000
4. If K represents carrying capacity, r representstheintristic growth rate, and N represents the number of organismsina population, which of the following is the formula forlogisticgrowth?
A. rN(N-K)/K    B.rK(r-N)/K    C. rN(N-r)/rK    D. rN(K-N)/K     E. rK(K-N)/rN
5. Lichens are usually among the first species tocolonizeotherwise uninhabited rock. Due to this ability,lichens are a wellknown
A. primary community    B.pioneerspecies   C. startercommunity  D.  colony species  
E. settler species
6. All of the following are examples of negativesymbiosisexcept
A. amensalism   B. competition   C.commensalism   D. parasitism
7. Higher plants most often absorb nitrogen from soil intheform of
A. N2     B.N3    C. ammonia D.nitrates E. aminoacids

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