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R-selected and K-selected strategies Knowledge-Based Practice

Biology · Ecology · Biology · Populations

5 Biology practice questions on R-selected and K-selected strategies. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    In population ecology, which type of regulatory mechanism predominantly determines the mortality rates and population stability of K-selected species?

    • A) Density-independent abiotic disturbances
    • B) Density-dependent biotic interactions
    • C) Exponential reproductive physiological limits
    • D) Catastrophic weather-driven seasonal fluctuations
  2. 2.

    Which type of survivorship curve is most characteristically associated with r-selected species?

    • A) Type I curve, where high parental investment yields high juvenile survival rates
    • B) Type II curve, where the probability of mortality is constant across all age classes
    • C) Type III curve, where vast numbers of offspring experience high early mortality
    • D) Type I curve, where individuals survive mostly to old age before experiencing high mortality
  3. 3.

    How do population sizes of K-selected species typically behave over time in an undisturbed ecosystem?

    • A) They stabilize close to the carrying capacity through density-dependent regulation.
    • B) They experience frequent boom-and-bust cycles driven by density-independent mortality.
    • C) They continuously grow exponentially without experiencing resource-driven limits.
    • D) They remain suppressed near zero density due to extreme reproductive delay.
  4. 4.

    Which type of environmental condition primarily favors organisms that exhibit an r-selected reproductive strategy?

    • A) Stable climax ecosystems where population densities consistently fluctuate near the carrying capacity
    • B) Predictable environments characterized by intense intraspecific and interspecific competition
    • C) Mature habitats where population size is strictly regulated by density-dependent mortality factors
    • D) Unpredictable or frequently disturbed habitats where population density is kept well below carrying capacity
  5. 5.

    Which of the following life-history characteristics is typical of K-selected species rather than r-selected species?

    • A) Short lifespans and early reproductive maturity with high fecundity
    • B) High parental investment and prolonged care directed toward few offspring
    • C) Minimal parental care combined with high juvenile mortality rates
    • D) Frequent population crashes driven primarily by density-independent factors

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