Which of the following best describes a key similarity and a key difference between exponential and logistic growth models in population biology?

• A. Both models assume unlimited resources, but only the logistic model incorporates a carrying capacity.
• B. Both models predict population growth will eventually stop, but only the exponential model includes environmental resistance.
• C. Both models describe how populations grow over time, but the logistic model includes a carrying capacity that limits growth.
• D. Both models show populations declining after reaching carrying capacity, but only the exponential model shows a lag phase.

Answer: (C)

Verified step by step guidance

1. Understand the two growth models: Exponential growth describes population growth without resource limitations, resulting in a J-shaped curve. Logistic growth incorporates resource limitations and environmental resistance, resulting in an S-shaped curve.
2. Identify the key similarity: Both models describe how populations grow over time, focusing on changes in population size.
3. Identify the key difference: The logistic growth model includes a carrying capacity (K), which is the maximum population size that the environment can sustain. Exponential growth does not account for carrying capacity.
4. Clarify the role of carrying capacity in logistic growth: Carrying capacity limits population growth as resources become scarce, causing the growth rate to slow and stabilize.
5. Review the incorrect options: Exponential growth does not include environmental resistance or a carrying capacity, and neither model predicts populations declining after reaching carrying capacity or a lag phase.