Science Earth's Resources Ecosystems

This graph shows how the population in the United States has changed over time.

• The population has steadily decreased over time

• The population has steadily increased over time

• The population increased and then decreased

• The population decreased and then increased

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What happens when the population of prey decreases?

• The population of predator will increase

• The population of predator will increase and then decrease

• The population of predator will not be affected

• The population of predator will decrease shortly after

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How are the populations of predators and prey related?

• If there is not enough prey, the predators will die out

• If there is too much prey, the predators will die out

• If there are not any predators, the prey will die out

• If there are too many predators, the prey will overpopulate

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How are ecosystems disrupted?

• Due to the care and excessive maintenances of natural spaces.

• As a result of creating new natural resources.

• Due to the occupation, pollution and destruction of natural spaces.

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When does the extinction of a species occur?

• When there are only five individuals left.

• When the youngest individuals die, but the adults remain.

• When the last individual dies.

• FIrst and 3rd option are right.

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What is the correct definition of a population.

• Groups of individuals of the same species.

• Made up of the different populations living together.

• All the organisms living in a habitat AND the non-living parts of the habitats e.g. an ocean.

• Trying to get enough resources.

Organisms that make up the living part of an ecosystem.

• abiotic
• biotic factors
• ecology
• ecosystems

Which of the following factors do plants compete for?

• Light, space, water & mates

• Water, mates, space & mineral ions

• Space, water, mineral ions & light

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Below is an example of a simple food chain.

Acorn → Squirrel → Fox → Mountain Lion 

What will most likely happen if squirrels are removed from the food chain?

• The fox will eat acorns
• The fox population will decrease
• The trees will produce fewer acorns.
• The mountain lion population will increase

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How do the population sizes of predator & prey change in a stable community?

• The size of the predator population continuously increases.

• The size of the prey population continuously decreases.

• The sizes of both populations rise and fall in cycles.

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