Exponential growth

Definition

Exponential growth describes a situation where the rate of population increase becomes more rapid in proportion to the growing total number or size. This type of growth occurs when resources are abundant and environmental conditions are ideal.

5 Must Know Facts For Your Next Test

1. Exponential growth is represented by a J-shaped curve on a graph of population size over time.
2. It occurs when the per capita rate of increase remains constant.
3. In natural populations, exponential growth is usually unsustainable due to environmental limits such as food and space.
4. Bacteria often exhibit exponential growth under ideal laboratory conditions.
5. Exponential growth can lead to overshooting carrying capacity, resulting in population crashes.

Review Questions

• What shape does exponential growth form on a graph?
• Why is exponential growth typically unsustainable in natural populations?
• How might exponential growth affect a population's long-term survival?

Related terms

Carrying Capacity: The maximum population size that an environment can sustainably support.

Logistic Growth: A type of population growth where the rate decreases as the population reaches carrying capacity, forming an S-shaped curve.

Per Capita Rate of Increase: The average individual contribution to the total population growth rate.