The Biosphere Review

What role do decomposers play in an ecosystem

• fossilize dead animals

• break down dead organisms and return their nutrients to the nutrient cycles

• increase biomass of a trophic level

• combine with consumers to create new limiting nutrients

Each of the following is an abiotic factor in the environment EXCEPT

• temperature

• soil

• sunlight

• plant life

What is a highly organized, structured environment in which all parts live in a delicate balance.

• Population

• Biosphere

• Ecosystem

• Community

The prefix a- means?

• adjective former

• land, earth

• record, writing

• not, without, lacking, deficient

The number and VARIETY of organisms in a given area is called its ______________.

• Biosphere

• Population

• Community

• Biodiversity

What is the leading cause of species extinction?

• overpopulation

• disease

• competition for resources

• habitat destruction

Which trophic level signifies the top of the food chain?

• producer

• decomposer

• primary consumer

• apex predator

How does a keystone predator influence its ecosystem?

• they control population sizes of other organisms

• they helps increase biodiversity in the ecosystem

• they fill a specific niche that no other organism could occupy

• all of the options are correct

Analyze the food web in the image. If all of the grasshoppers were to suddenly die off from a disease, what would be the outcome?

• Grass populations would increase

• Birds populations would decrease

• Grain populations would increase

• All of the options are possible outcomes

What does the arrow signify in a food chain?

• Transfer of energy

• What eats what

• How many organisms are present

• How much food an organism needs