Ecosystem Components and Interactions

The video introduces ecosystems, explaining their complex organization and the roles of biotic and abiotic components. It covers energy flow, starting from the sun, through producers and consumers, and the cycling of nutrients. The lesson discusses population density, its regulation by limiting factors, and the impact of abiotic and biotic factors on ecosystems. Examples illustrate how changes in these factors can affect population sizes.

What does the prefix 'bio' signify in the context of ecosystems?

• Life

• Air

• Water

• Earth

Which component is responsible for the energy flow in ecosystems?

• Water

• Soil

• Sun

• Air

What is the term for a group of organisms of the same species living in a specific area?

• Biosphere

• Population

• Community

• Ecosystem

Which of the following is a density-dependent factor?

• Competition

• Weather

• Pollution

• Natural disasters

What is a characteristic of density-independent factors?

• They are triggered by crowding.

• They affect populations regardless of size.

• They are mostly biotic.

• They affect only large populations.

Which of the following is an abiotic factor?

• Fungi

• Temperature

• Animals

• Plants

How do abiotic factors influence biotic components in an ecosystem?

• They are not necessary for biotic survival.

• They provide essential nutrients and conditions.

• They provide energy for photosynthesis.

• They are consumed by herbivores.

What happens to a population if it cannot adapt to a change in abiotic factors?

• It will remain stable.

• It will increase in size.

• It will migrate successfully.

• It will decrease in size.

Which of the following is an example of a biotic factor?

• Bacteria

• Minerals

• Water

• Sunlight

What is the role of decomposers in the nutrient cycle?

• They compete for resources.

• They break down organic matter.

• They consume producers.

• They produce energy from sunlight.