Grade 12 Biology Assessment

Which of the following is NOT a component of an ecosystem?

• Producers

• Consumers

• Decomposers

• A single organism

What is the primary source of energy in an ecosystem?

• Water

• The Sun

• Heat

• Soil

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

• Temperature

• Soil composition

• Water availability

• Plants

In an ecological study, which term describes the role of an organism within its environment?

• Niche

• Habitat

• Population

• Community

What is the term for the movement of water through an ecosystem?

• Nitrogen cycle

• Carbon cycle

• Water cycle

• Energy flow

A community of organisms interacting with each other and their physical environment is called:

• A habitat

• An ecosystem

• A population

• A biome

Which of the following processes converts atmospheric nitrogen into usable compounds for plants?

• Denitrification

• Nitrogen fixation

• Photosynthesis

• Respiration

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

• An organism that consumes other organisms for energy

• An organism that synthesizes its own food using sunlight

• An organism that decomposes dead organic matter

• An organism that provides shelter for other organisms

Which is a characteristic of a population in an ecological study?

• All living organisms in a given area

• Only one species in a defined area

• The interactions between organisms and their environment

• The physical and chemical factors of the environment

Which term refers to the variety of species in a given ecosystem?

• Population density

• Species diversity

• Biome

• Biotic index