Lesson 1 Ecological Principles

What is the correct order of ecological levels from smallest to largest?

• Biosphere → Community → Population → Organism → Ecosystem

• Organism → Population → Community → Ecosystem → Biosphere

• Population → Organism → Biosphere → Community → Ecosystem

• Ecosystem → Biosphere → Community → Organism → Population

What defines a biome?

• A single population of organisms

• A specific, naturally occurring ecological region (e.g., forest, wetland)

• The interaction between a predator and its prey

• A niche in which an organism lives

Which of the following is NOT a biotic factor?

• Sunlight

• Trees

• Insects

• Bacteria

Which of the following describes a niche?

• The role an organism plays in its environment

• The number of organisms in an area

• The physical location where an organism lives

• A group of species that compete for resources

Which of the following is an example of a population?

• All the trees in a forest

• A herd of deer in a national park

• A pond and all the living organisms in it

• The Earth’s biosphere

What is the difference between a community and an ecosystem?

• A community includes abiotic factors, while an ecosystem does not.

• An ecosystem includes both biotic and abiotic factors, while a community only includes biotic factors.

• A community consists of only one species, while an ecosystem consists of multiple species.

• Communities occur only in aquatic environments, while ecosystems occur everywhere.

Which biome is characterized by poor-draining soils and aquatic vegetation?

• Desert

• Taiga

• Wetlands

• Grasslands

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Which of the following is a characteristic of the taiga biome?

• Warm temperatures year-round

• High species diversity, like in rainforests

• Long, harsh winters with short summers

• Lack of trees and mostly grassland

What is the definition of ecology?

• The study of the universe and its origin

• The study of interactions between organisms and their environment

• The study of weather patterns over time

• The study of human history

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Which term describes all the living and non-living things that interact in a specific area?

• Population

• Community

• Ecosystem

• Biome

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