Limiting factors Knowledge-Based Download PDF

Questions

1. 1.

   According to the concept of ecological tolerance, an abiotic environmental factor can limit population growth or survival under which of the following conditions?

   • A) Only when the factor is entirely absent from the ecosystem
   • B) Exclusively when the concentration of the factor falls below a minimum required threshold
   • C) Only when biotic interactions such as interspecific competition amplify its effects
   • D) When the factor's intensity or concentration is either below the minimum or above the maximum tolerable level
2. 2.

   Which ecological principle states that the growth of a population is constrained by whichever essential resource is in the shortest supply relative to the organism's requirements, rather than by the total amount of resources available?

   • A) Gause's competitive exclusion principle
   • B) Shelford's law of tolerance
   • C) Liebig's law of the minimum
   • D) Bergmann's rule
3. 3.

   Which statement best describes the relationship between environmental limiting factors and a population's carrying capacity ($K$)?

   • A) Limiting factors cause the carrying capacity to increase indefinitely whenever birth rates exceed death rates.
   • B) Limiting factors only exert an effect after a population has experienced a complete ecological collapse.
   • C) The collective availability of limiting factors establishes the maximum sustainable population size an ecosystem can maintain.
   • D) Limiting factors eliminate all intraspecific competition within a population once the carrying capacity is reached.
4. 4.

   Which of the following statements best characterizes a density-independent limiting factor in population ecology?

   • A) It causes an increasing proportion of deaths as the spatial crowding of individuals rises.
   • B) It regulates population size primarily by intensifying competition for limited nesting sites.
   • C) It stabilizes population numbers near the carrying capacity through negative feedback loops.
   • D) It reduces population numbers by a mechanism that does not depend on the concentration of individuals per unit area.
5. 5.

   Which of the following environmental factors acts as a density-dependent limiting factor on a natural population?

   • A) A prolonged regional drought that reduces surface water supplies
   • B) A contagious bacterial infection that spreads through direct physical contact
   • C) A sudden volcanic eruption depositing heavy ash over breeding grounds
   • D) An unseasonal late frost freezing foliage and young seedlings