Population growth analysis: The transitional middle portion of a logistic population growth curve represents which type of growth behaviour?

Introduction / Context:
The logistic growth curve is widely used in biology and demography. It has three phases: lag phase, exponential (geometric) phase, and stationary phase. This question tests the recognition of the middle phase.

Given Data / Assumptions:

• Curve type: Logistic (S-shaped).
• Middle portion: Represents rapid growth before resource limitations act.

Concept / Approach:
The middle part of a logistic curve shows exponential (geometric) growth, as resources are abundant and population grows rapidly. Later, growth slows down due to limiting factors.

Step-by-Step Solution:

Verification / Alternative check:
Population models in civil engineering planning confirm that exponential growth precedes saturation in urban populations.

Why Other Options Are Wrong:

• Logarithmic growth: Refers to slower, diminishing growth, not the rapid stage.
• First over curve: Not a standard term in growth modelling.
• A constant rate: Refers to arithmetic growth, not logistic mid-phase.

Common Pitfalls:

• Confusing logarithmic with geometric growth due to similar wording.
• Believing population always grows linearly, ignoring saturation effects.

Final Answer:
Geometric growth