If resources limit how large a population can become, scientists call this limit the population's what?

If resources limit how large a population can become, scientists call this limit the population's what?

• A. Carrying capacity
• B. Growth rate
• C. Limiting factor
• D. Biotic potential

Answer: (A)

The idea being tested is how the availability of resources sets a maximum size for a population. When there isn’t enough food, water, space, or other necessities, a population can’t grow beyond what the environment can support over time. This limit is called carrying capacity—the largest population that the environment can sustain indefinitely given the resources available. Once a population reaches carrying capacity, births tend to balance deaths and the numbers level off, though the exact number can shift if resources become more or less abundant. Growth rate describes how fast the population is changing, not the ultimate size it can reach. A limiting factor is a condition that slows or stops growth, but it’s the factor that can constrain growth rather than defining the exact maximum size. Biotic potential is the maximum possible growth under ideal conditions, not the real-world limit set by resource availability.

The idea being tested is how the availability of resources sets a maximum size for a population. When there isn’t enough food, water, space, or other necessities, a population can’t grow beyond what the environment can support over time. This limit is called carrying capacity—the largest population that the environment can sustain indefinitely given the resources available. Once a population reaches carrying capacity, births tend to balance deaths and the numbers level off, though the exact number can shift if resources become more or less abundant.

Growth rate describes how fast the population is changing, not the ultimate size it can reach. A limiting factor is a condition that slows or stops growth, but it’s the factor that can constrain growth rather than defining the exact maximum size. Biotic potential is the maximum possible growth under ideal conditions, not the real-world limit set by resource availability.