CLEP Biology Ecology & Evolutionary Processes 3 — Questions and Answers
Question 1: Which ecological concept describes the maximum population size an environment can sustain indefinitely?
- Biotic potential
- Carrying capacity (Correct answer)
- Ecological footprint
- Trophic cascade
Correct answer: Carrying capacity
Carrying capacity (K) is the maximum population size that an environment can support given the available resources such as food, water, and space.
Question 2: The Hardy-Weinberg equilibrium is maintained when which of the following conditions is met?
- Natural selection acts strongly on the population
- Mating is random and no evolutionary forces act (Correct answer)
- The population is very small
- Frequent mutations occur at both alleles
Correct answer: Mating is random and no evolutionary forces act
Hardy-Weinberg equilibrium requires random mating and the absence of mutation, gene flow, genetic drift, and natural selection.
Question 3: Which type of ecological succession begins in an area that has never supported life, such as bare rock?
- Secondary succession
- Climax succession
- Primary succession (Correct answer)
- Facilitated succession
Correct answer: Primary succession
Primary succession starts in lifeless areas with no soil, beginning with pioneer species such as lichens that break down rock to create soil.
Question 4: An organism that occupies a broad ecological niche and tolerates a wide range of environmental conditions is called:
- A specialist
- A generalist (Correct answer)
- A pioneer species
- A keystone species
Correct answer: A generalist
Generalists (eurytopic species) can exploit many different types of food, habitats, and conditions, making them highly adaptable compared to specialists.
Question 5: In the context of evolution, convergent evolution produces organisms that are:
- Closely related with similar traits
- Distantly related but with similar traits due to similar environments (Correct answer)
- Identical in genotype and phenotype
- Related through a recent common ancestor
Correct answer: Distantly related but with similar traits due to similar environments
Convergent evolution occurs when unrelated species independently evolve similar traits in response to similar environmental pressures, such as dolphin and shark body shapes.
Question 6: Which term describes the total variety of genes, species, and ecosystems in a region?
- Genetic drift
- Biodiversity (Correct answer)
- Ecological resilience
- Biomass
Correct answer: Biodiversity
Biodiversity encompasses genetic diversity, species diversity, and ecosystem diversity, and is critical for ecosystem stability and function.
Question 7: The process by which plants release water vapor through their leaves, contributing to the water cycle, is called:
- Transpiration (Correct answer)
- Evaporation
- Condensation
- Respiration
Correct answer: Transpiration
Transpiration is the release of water vapor through stomata in plant leaves, accounting for a significant portion of water movement in the hydrological cycle.
CLEP Biology Ecology & Evolutionary Processes 3
Which ecological concept describes the maximum population size an environment can sustain indefinitely?