The carrying capacity k of an environment all of the

Question

1. Which of the following can be considered a contribution toa density-dependent regulation of populations?
A.predation           B. intraspecific competition of nutrients   C. the accumulation of toxic wastes
D. none of the above      E. A,B, and C 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 of density-dependentpopulation regulation
3. To measure the population density of grasshoppersoccupying a soccer field, 100 grasshoppers are captured,marked with a red dot, and then released. The next day,another 100 grasshoppers are captured, including the recapture of20 marked grasshoppers. One would 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 represents theintristic growth rate, and N represents the number of organisms ina population, which of the following is the formula for logisticgrowth?
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 tocolonize otherwise uninhabited rock. Due to this ability,lichens are a well known
A. primary community    B. pioneerspecies   C. starter community  D.  colony species 
E. settler species
6. All of the following are examples of negativesymbiosis except
A. amensalism   B. competition   C. commensalism   D. parasitism
7. Higher plants most often absorb nitrogen from soil inthe form of
A. N₂     B. N₃    C. ammonia D.nitrates E. amino acids