Test: Factors Affecting Population Sizes - JAMB MCQ

Biotic factors refer to living components of an ecosystem. Disease is a biotic factor as it involves interactions between organisms. Temperature (A), rainfall (B), and pH (D) are abiotic factors, which are non-living components that can also influence populations, but they do not fall under the category of biotic factors.

Abiotic factors are non-living components of an ecosystem. Space availability (C) is an abiotic factor that affects population sizes by limiting the physical area in which organisms can live. Predation (A), reproductive ability (B), and competition (D) are biotic factors as they involve interactions between living organisms.

Biotic factors such as food availability (B) can limit population growth by influencing the availability of resources necessary for survival and reproduction. Topography (A), pressure (C), and rainfall (D) are abiotic factors that may affect populations, but they do not directly relate to limiting population growth due to biotic interactions.

Abiotic factors like temperature (C) can directly influence population sizes by affecting the physiology and behavior of organisms. Pest infestation (A), disease outbreak (B), and reproductive ability (D) are biotic factors that involve interactions between organisms.

Reproductive ability (C) is a biotic factor that can lead to competition among individuals within a population, as individuals compete for mates and reproductive resources. Rainfall (A), pH (B), and space (D) are abiotic factors that do not directly relate to competition among individuals.

Topography (C) is an abiotic factor that can influence population sizes by creating physical barriers or unique habitats that affect the distribution and abundance of organisms. Predation (A), disease (B), and food availability (D) are biotic factors that involve interactions between organisms.

Predation (D) is a biotic factor that can regulate population sizes by controlling the abundance of prey species through predation. Space (A), temperature (B), and rainfall (C) are abiotic factors that may indirectly influence population sizes but do not regulate populations through predation.

pH (C) is an abiotic factor that can impact population sizes by affecting the availability of suitable habitats or influencing physiological processes in organisms. Disease (A), competition (B), and reproductive ability (D) are biotic factors that involve interactions between organisms.

Space (B) is a biotic factor that can influence population sizes by determining the availability of physical areas for individuals to occupy, leading to competition for resources. Rainfall (A), temperature (C), and pH (D) are abiotic factors that do not directly relate to competition among individuals.

Temperature (C) is an abiotic factor that can directly impact population sizes by affecting metabolic rates, reproduction, and other physiological processes in organisms. Pest infestation (A), disease outbreak (B), and competition (D) are biotic factors that involve interactions between organisms.