Ecosystem Dynamics and Population Growth

The video tutorial covers key concepts in ecosystems and ecology, including biotic and abiotic factors, population dynamics, niche concepts, limiting factors, carrying capacity, and biotic relationships. It explains population growth models like J-curve and S-curve and concludes with a homework assignment and review instructions.

What is the primary difference between biotic and abiotic factors?

• Biotic factors are nonliving, while abiotic factors are living.

• Biotic factors are living, while abiotic factors are nonliving.

• Biotic factors include water and light, while abiotic factors include animals.

• Biotic factors are always visible, while abiotic factors are not.

Which of the following best describes a realized niche?

• The niche that is only occupied during certain seasons.

• The theoretical habitat of a species.

• The specific conditions where a species actually lives.

• The full range of conditions under which a species can survive.

What is a limiting factor in an ecosystem?

• A factor that only affects abiotic components.

• A factor that increases the population size indefinitely.

• A factor that restricts the growth of a population.

• A factor that has no impact on population dynamics.

Interspecific competition occurs between:

• Members of the same species.

• Members of different species.

• Abiotic and biotic factors.

• Predators and their prey.

Which relationship involves one organism benefiting while the other is harmed?

• Mutualism

• Symbiosis

• Commensalism

• Parasitism

What is an example of mutualism?

• A tree providing shade to a plant.

• Cleaner fish removing parasites from a shark.

• A tapeworm living in a host.

• A lion hunting a zebra.

What characterizes a J-curve in population growth?

• A steady increase followed by a plateau.

• Growth that fluctuates around a carrying capacity.

• Exponential growth without leveling off.

• Rapid growth followed by a sharp decline.

What is the carrying capacity of an environment?

• The maximum number of species that can be supported indefinitely.

• The minimum number of species needed for survival.

• The average number of species in an ecosystem.

• The number of species that can be supported temporarily.

Which of the following is a characteristic of an S-curve in population growth?

• Population remains constant over time.

• Population grows and stabilizes around a carrying capacity.

• Population decreases steadily.

• Population grows rapidly and then crashes.

What might happen if a population overshoots its carrying capacity?

• The carrying capacity will increase.

• The population will continue to grow indefinitely.

• The population will stabilize immediately.

• The population may experience a die-off.