2.1 Quiz Review

Which of the following is a biotic factor in the prairie ecosystem

• water

• sunlight

• soil

• grass

Answer explanation

Grass is the only living organism out of these choices.

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The place where an organism lives and that provides the things the organism needs is called its

• habitat

• population

• species

• community

Answer explanation

habitats provide shelter as well as life supporting materials for an organism to survive.

The smallest unit of ecological organization is a single

• population

• community

• organism

• ecosystem

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Which of the following is an example of a population?

• The cats and dogs in your neighborhood

• The bushes and grass in the park

• The rocks in a rock collection

• The gray wolves in a forest

Answer explanation

Members of population must be the same LIVING interbreeding species.

An organism's particular role in its habitat, or how it makes its living, is called its

• carrying capacity

• ecosystem

• competition

• niche

Answer explanation

a niche is a particular role a species fills in its habitat, usually species that fill a niche avoid interspecies competition.

The behaviors and physical characteristics of species that allow them to live successfully in their environment are called

• habitats

• limiting factors

• biotic factors

• adaptations

Answer explanation

species need to adapt or they will eventually be outcompeted and become extinct. "adapt or die"

The struggle between organisms to survive in a habitat with limited resources is called

• competition

• predation

• symbiosis

• parasitism

Answer explanation

Most ecosystems on the planet have some form of competition, competition keeps populations in check and creates balance in a habitat.

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When a jellyfish paralyzes a tiny fish with its poisonous tentacles, the fish is the

• predator

• prey

• host

• parasite

Answer explanation

The jellyfish (predator) has special adaptations to help it catch the more agile fish (prey).

A close relationship between two species that benefits at least one of the species is called

• natural selection

• symbiosis

• adaptation

• competition

Answer explanation

Symbiosis can present itself in many different forms, depending on the relationship of the species involved.

The Escherichia coli that live in your intestine and help break down food are an example of which type of interaction?

• competition

• mutualism

• parasitism

• predation

Answer explanation

The bacteria survive off the waste in your intestine while simultaneously helping you clear your gut of unwanted waste. Both species are benefitting from the relationship.

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