Problem 6 - Campbell Biology

Question

Level \(2 :\) Application/Analysis The observation that members of a population are uniformly distributed suggests that (A) resources are distributed unevenly. (B) the members of the population are competing for access to a resource. (C) the members of the population are neither attracted to nor repelled by one another. (D) the density of the population is low.

Step-by-Step Solution

Answer

Option (B) is correct as competition for resources leads to uniform distribution.

Step 1: Analyze the Uniform Distribution

A uniform distribution means members of the population are spaced evenly. Consider what might cause such a distribution pattern.

Step 2: Examine Resource Distribution

If resources were distributed unevenly, population members would cluster around these resources, leading to a clumped distribution rather than uniform. Therefore, option (A) is unlikely.

Step 3: Consider Competition for Resources

Competition for resources can lead to uniformly distributed members as they space out to access resources. Therefore, consider option (B).

Step 4: Evaluate Interaction Among Population Members

If population members are neither attracted to nor repelled by each other, they would be randomly distributed rather than uniformly. Hence, option (C) is not likely.

Step 5: Examine Population Density

Low population density would not necessarily result in uniform distribution. Members could still be randomly or clumped based on resource availability. Therefore, option (D) is unlikely.

Step 6: Select the Best Answer

Given the analysis, the most likely cause for uniform distribution is competition for resources. Select option (B).

Key Concepts

uniform distribution

Uniform distribution means members of a population are evenly spaced out. Imagine a group of plants in a garden that are planted exactly one foot apart from one another, making a neat grid-like pattern. This spacing suggests deliberate placement or inherent behavior allowing all individuals to utilize an evenly distributed resource. Uniform distribution is generally rare in nature because environmental factors and behaviors usually cause variability in spacing. However, when uniform distribution occurs, it often points to underlying factors such as interactions among individuals or specific environmental pressures.

resource competition

Resource competition is when individuals in a population vie for the same resources such as food, water, or light. This struggle for resources can often lead to a uniform distribution because each individual tries to maximize their own access to the resource by avoiding too much overlap with others. This can be seen in certain animal territories or plant spacing. Each individual maintains a certain distance from others to reduce competition, resulting in a regularly spaced pattern. Understanding resource competition helps us comprehend how individual behavior affects overall population structures.

population density

Population density refers to the number of individuals within a given area. High population density might lead to intense competition for scarce resources, causing individuals to spread out as much as possible, sometimes resulting in uniform distribution. Conversely, in areas with low population density, individuals might be distributed randomly or in clumps, depending on resource availability and social interactions. Thus, population density directly influences how individuals within a population are spaced relative to each other and their resources. Studying population density provides insights into the spatial organization and competition dynamics within ecological communities.