Habitat and niche Knowledge-Based Practice

Questions

1. 1.

   When interspecific competition occurs within a biological community, how does the realized niche of a competing species typically relate to its fundamental niche?

   • A) The realized niche is broader than the fundamental niche because competition forces organisms to expand their physiological tolerance ranges.
   • B) The realized niche is narrower than the fundamental niche because competitors restrict access to portions of the available resource spectrum.
   • C) The realized niche remains identical to the fundamental niche because biotic interactions do not influence how organisms exploit resources.
   • D) The realized niche completely replaces the fundamental niche by permanently shifting the species' abiotic survival limits.
2. 2.

   Which ecological phenomenon occurs when coexisting species with overlapping resource needs subdivide an ecological niche by utilizing different microhabitats, feeding times, or food types?

   • A) Resource partitioning
   • B) Competitive exclusion
   • C) Ecological succession
   • D) Habitat fragmentation
3. 3.

   Which ecological term describes the total range of environmental conditions and resources a species can theoretically exploit in the complete absence of interspecific competition and other limiting biotic interactions?

   • A) Realized niche
   • B) Fundamental niche
   • C) Geographic range
   • D) Trophic level
4. 4.

   According to the competitive exclusion principle, what is the expected outcome when two distinct species attempt to occupy identical ecological niches within the same habitat?

   • A) Both species will share resources equally and maintain stable, identical population sizes indefinitely.
   • B) The carrying capacity of the habitat will double to accommodate both species simultaneously.
   • C) Both species will interbreed to produce a hybrid population with broader environmental tolerances.
   • D) One species will outcompete the other, leading to local extinction or an evolutionary shift in resource use.
5. 5.

   Which of the following statements correctly distinguishes between an organism's habitat and its ecological niche?

   • A) Habitat includes only the biotic community in an ecosystem, whereas ecological niche refers strictly to abiotic physical conditions.
   • B) Habitat refers to the physical environment where an organism lives, whereas ecological niche encompasses its functional role and resource interactions within that community.
   • C) Habitat describes an organism's trophic level in a food chain, whereas ecological niche describes its broad geographic distribution across biomes.
   • D) Habitat can be occupied by only one species at any given time, whereas an ecological niche is identically shared by all competing species in an area.

Answers and step-by-step solutions appear after you finish the test.