Ecosystem Dynamics and Biodiversity

The video introduces fifth-graders to ecosystems, focusing on the interaction of living and nonliving elements, energy flow, and the importance of diversity. It explains biotic and abiotic components, populations, communities, and the concept of niches. The video also discusses competition, limiting factors, and human impact on ecosystems, emphasizing the need for balance and conservation.

What is the primary source of energy for ecosystems?

• The Sun

• The Moon

• Volcanoes

• Wind

Which of the following is a biotic component of an ecosystem?

• Air

• Plants

• Water

• Rocks

What term describes a group of the same species living in an ecosystem?

• Niche

• Population

• Habitat

• Community

What is a limiting factor in an ecosystem?

• A type of plant

• A predator in the ecosystem

• A resource that restricts population growth

• A resource that is abundant

How do organisms with narrow niches differ from those with broad niches?

• They eat a wide range of foods

• They migrate frequently

• They have a specific way of living

• They can live in a variety of environments

What is the role of a niche in an ecosystem?

• It is the physical space an organism occupies

• It is the complete role or function of an organism

• It is the climate of the ecosystem

• It is the food chain position

Why is biodiversity important in an ecosystem?

• It increases the complexity of the food web

• It simplifies resource availability

• It reduces competition

• It limits the number of species

Which ecosystems are typically more diverse?

• Deserts

• Polar regions

• Coral reefs

• Urban areas

How do human activities impact ecosystems?

• They have no effect

• They increase biodiversity

• They always improve habitats

• They can reduce the number of species

What is one consequence of overhunting in ecosystems?

• Enhanced food availability

• Increased species diversity

• Decreased population of important species

• Improved habitat conditions