Unit 1- 1a & 1b

Which list correctly orders the levels of biological organization from smallest to largest?

• Population → Organism → Community → Ecosystem → Biosphere

• Organism → Population → Community → Ecosystem → Biosphere

• Organism → Community → Population → Ecosystem → Biosphere

• Biosphere → Ecosystem → Community → Population → Organism

Which of the following best defines a habitat?

• The specific place where an organism lives

• The process of energy flow in a food web

• The role an organism plays in its environment

• The total number of species in an area

What term describes all the populations of different species living and interacting in a particular area?

• Biosphere

• Habitat

• Community

• Organism

Which of the following best describes a population in an ecosystem?

• All the communities in a biome

• All the plants and animals in a habitat

• All the organisms of the same species living in a specific area

• All the abiotic factors in an area

What is the main difference between a community and an ecosystem?

• A community is larger than an ecosystem

• A community is the same as an ecosystem

• A community includes abiotic factors, while an ecosystem includes only biotic factors

• A community includes only biotic factors, while an ecosystem includes both biotic and abiotic factors

Which term refers to the variety of living organisms in a particular ecosystem?

• Niche

• Habitat

• Population

• Biodiversity

Biodiversity refers to

• extinct species

• the variety of species on Earth

• nonrenewable resources

• the rate of species decline

Answer explanation

Biodiversity refers to the variety of species on Earth. It is the total number of different species of plants, animals, and microorganisms in a given area. Biodiversity is important because it contributes to the stability and resilience of ecosystems, as well as providing numerous benefits to humans, such as food, medicine, and clean water. The correct choice is 'the variety of species on Earth'.