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Population size and density

Biology • Populations • Knowledge-Based • 5 questions

Population size and density Knowledge-Based Download PDF

Biology · Ecology · Biology · Populations

5 Biology practice questions on Population size and density. Questions that assess core concepts and understanding.

Questions

  1. 1.

    Which of the following sampling techniques is most appropriate for estimating the population density of sessile or sedentary organisms, such as wildflowers or intertidal barnacles?

    • A) Lincoln-Petersen mark-recapture method
    • B) Radio-telemetry tracking
    • C) Quadrat sampling
    • D) Motion-activated camera trapping
  2. 2.

    In population ecology, how does ecological density differ from crude density?

    • A) Ecological density considers only the area of habitable space actually available to the population, whereas crude density includes the total area.
    • B) Ecological density measures the total area occupied by the community, whereas crude density measures only the breeding territory.
    • C) Ecological density quantifies the number of species per unit volume, whereas crude density quantifies the number of individuals of a single species.
    • D) Ecological density accounts for seasonal changes in biomass, whereas crude density accounts only for direct physical counts of living organisms.
  3. 3.

    Under what condition will the density of a population increase if the geographic area it occupies remains unchanged?

    • A) The sum of deaths and emigrations exceeds the sum of births and immigrations.
    • B) The sum of births and immigrations exceeds the sum of deaths and emigrations.
    • C) The rate of emigration is greater than the rate of immigration while birth and death rates are equal.
    • D) The mortality rate is higher than the birth rate while the immigration rate equals the emigration rate.
  4. 4.

    A wildlife reserve initially covers 10 square kilometers and supports a population of 500 deer. If the reserve area is expanded to 20 square kilometers while the deer population grows to 800 individuals, what is the net change in population density?

    • A) It increases by 30 deer per square kilometer.
    • B) It increases by 10 deer per square kilometer.
    • C) It decreases by 10 deer per square kilometer.
    • D) It decreases by 20 deer per square kilometer.
  5. 5.

    Which of the following statements correctly distinguishes population size from population density?

    • A) Population size describes the spatial dispersion of organisms, whereas population density measures total biological mass.
    • B) Population size represents the total number of individuals, whereas population density represents the number of individuals per unit area or volume.
    • C) Population size changes solely through immigration and emigration, whereas population density depends exclusively on birth and death rates.
    • D) Population size is quantified per unit volume, whereas population density is an absolute count of organisms across an entire geographic range.