HS LS 2-1 Population Dynamics and Growth Models

Define the term "carrying capacity" in your own words.

• The maximum land area that an environment can sustain indefinitely.
• The average population size that an environment can sustain indefinitely.
• The minimum population size that an environment can sustain indefinitely.
• The maximum population size that an environment can sustain indefinitely.

Explain why understanding carrying capacity is important in ecology.

• Carrying capacity is important for managing and conserving natural resources, predicting population dynamics, and making informed decisions for sustainable development.
• Carrying capacity is only relevant for small-scale ecosystems
• Understanding carrying capacity is only important for urban planning
• Carrying capacity has no impact on ecology

Describe how the carrying capacity of an environment can be affected by human activities.

• Human activities can reduce the carrying capacity of an environment.
• Human activities have no impact on the carrying capacity of an environment.
• Human activities always increase the carrying capacity of an environment.
• Carrying capacity is not affected by human activities.

Give an example of a real-world ecosystem and explain how its carrying capacity might have changed over time.

• A desert ecosystem; due to factors such as excessive rainfall, overpopulation of herbivores, or lack of predators.
• An ocean ecosystem; due to factors such as pollution, overfishing, or introduction of invasive species.
• A grassland ecosystem; due to factors such as extreme weather events, decrease in herbivore population, or natural disasters.
• A forest ecosystem; due to factors such as climate change, deforestation, introduction of new species, or human activities.

Imagine a scenario where a population of deer exceeds the carrying capacity of its habitat. Predict what might happen to the deer population and the ecosystem as a whole.

• The deer population will increase due to abundance of food and resources
• The deer population may decline due to lack of food and increased competition for resources, leading to habitat degradation and disruption of ecological balance.
• The ecosystem will become more balanced and stable
• The deer population will migrate to a new habitat and thrive

Explain the difference between exponential growth and logistic growth in the context of population growth models.

• Exponential growth is limited, while logistic growth is unlimited.
• Exponential growth is unlimited, while logistic growth is limited by carrying capacity.
• Exponential growth is affected by carrying capacity, while logistic growth is not.
• Exponential growth occurs in a closed system, while logistic growth occurs in an open system.

A population of rabbits in a forest ecosystem has an initial population of 100 rabbits. The carrying capacity of the forest is estimated to be 1000 rabbits. The population of rabbits grows at a rate of 0.1 per year (10% growth rate). Calculate the population size after 5 years using the logistic growth model.

• 500.25
• 800.67
• 200.89
• 377.54

In a hypothetical population of bacteria, the carrying capacity of the environment is 500 bacteria. If the initial population size is 50 bacteria and the growth rate is 0.2 per hour (20% growth rate), calculate the population size after 10 hours using the logistic growth model.

• Population size after 10 hours is 300 bacteria
• Population size after 10 hours is 50 bacteria
• Population size after 10 hours is 454 bacteria
• Population size after 10 hours is 600 bacteria

Discuss why the logistic growth model is more realistic than the exponential growth model when describing population growth in a limited environment.

• The logistic growth model assumes unlimited resources
• The logistic growth model does not consider population size
• The logistic growth model ignores limiting factors and competition
• The logistic growth model accounts for limiting factors such as available resources and competition, which are present in real-world environments.

A population of fish in a lake has been steadily increasing over the past few years. The lake is well-stocked with food, and there are no natural predators for the fish in the lake. Predict what might happen to the fish population in the future if the lake's carrying capacity is reached. What factors might limit the growth of the fish population in the lake?

• The fish population will continue to increase indefinitely
• The fish population will decrease rapidly
• The fish population will migrate to a different lake
• The fish population will stabilize or decline