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Chapter 53: Q1TYU (page 1188)

Population ecologists follow the fate of same-age cohorts to

(A) determine a population鈥檚 carrying capacity.

(B) determine the birth rate and death rate of each group in a population.

(C) determine if a population is regulated by density-dependent processes.

(D) determine the factors that affect the size of a population.

Short Answer

Expert verified
  1. The statement 鈥渄etermine a population鈥檚 carrying capacity鈥� is false.
  2. The statement 鈥渄etermine the birth rate and death rate of each group in a population鈥� is true.
  3. The statement 鈥渄etermine if a population is regulated by density-dependent processes鈥� is false.
  4. The statement 鈥渄etermine the factors that affect the size of a population鈥� is false.

Step by step solution

01

Ecologist

The term ecologist represents a scientist that studies the biological branch of science, such as ecology, to study the interaction of living organisms (plants and animals) in their natural environment.

02

Explanation of option ‘(A)’

In population ecology, when the maximum number of species live in a particular environment, then their average population size is determined by the population鈥檚 carrying capacity.

Thus, the carrying capacity is not to be determined in the same-age cohorts.

Therefore, the given statement is false.

03

Explanation of option ‘(B)’

The term birth rate represents the ratio of births to the population of a given place that can be controlled through proper family planning. The ratio of deaths to the total population of a specified area that can be controlled by proper medicare is called the death rate.

Thus, the same-age cohort (organisms of the same age belong to the same population) is followed by the population ecologist; birth and death rates are tracked for organisms of the same age group.

Therefore, the given statement is true.

04

Explanation of option ‘(C)’

The whole group of particular species living and interbreeding in a single area is called population.

Thus, the density-dependent process is related to the change in population.

Therefore, the given statement is false.

05

Explanation of option ‘(D)’

The term population size gives information regarding the number of biological organisms residing in a specific area.

Thus, the factors affecting population size are not concerned with the stability of same-age group-cohort.

Therefore, the given statement is false.

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Most popular questions from this chapter

Describe three attributes of habitat patches that could affect population density and rates of immigration and emigration.

SYNTHESIZE YOUR KNOWLEDGE Locusts (grasshoppers in the family Acrididae) undergo cyclic population outbreaks, leading to massive swarms such as this one in the Canary Islands, off the west coast of Africa. Of the mechanisms of density-dependent regulation shown in Figure 53.18, choose the two that you think most apply to locust swarms, and explain why.

Analyzing ecological footprints reveals that

(A) Earth鈥檚 carrying capacity would increase if per capita meat consumption increased.

(B) current demand by industrialized countries for resources is much smaller than the ecological footprint of those countries.

(C) it is not possible for technological improvements to increase Earth鈥檚 carrying capacity for humans.

(D) the ecological footprint of the United States is large because per capita resource use is high.

Assuming that r= 1.0 and K= 1,500, calculate the population growth rate for four cases where population size (N) is greater than carrying capacity (K): N= 1,510, 1,600, 1,750, and 2,000 individuals. To do this, first write the equation for the population growth rate given in Table 53.2. Plug in the values for each of the four cases, starting with N= 1,510, and solve the equation for each

one. Which population size has the highest growth rate?

Contrast the selective pressures operating in high-density populations (those near the carrying capacity, K) versus low-density populations.a
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