6th Science

Which of these events would lead to an increase in the size of a population?

• More squirrels are born than die.

• Some squirrels emigrate in search of food.

• New predators are added to the ecosystem.

• A large number of squirrels die because of a forest fire.

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Resources needed to grow: (select all that apply)

• food

• water

• shelter

• coffee

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An abiotic resource is:

• tree

• bacteria

• sunlight

• plants

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A biotic resource is:

• sunlight

• bacteria

• water

• rainfall

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Which of these is the most likely reason that a population in an ecosystem could have a sharp decline?

• The number of prey suddenly increases.

• The number of predators suddenly decrease.

• The competition for the same resource suddenly drops.

• The abiotic resources in the environment suddenly drop.

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Without other changes to a population, which of these will cause a population to increase in size?

• The birth rate equals the death rate.

• The birth rate is less than the death rate.

• The birth rate is greater than the death rate.

• The birth rate and the death rate both equal zero.

When animals compete for resources, it limits the availability of resources to both populations. For example, if a population of hyenas increase, then it may lead to a __________ in lion population.

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A drought can cause plants to produce fewer seeds than usual, limiting food resources for small mammals. This would lead to a _____________ in population

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Corn crops left in the field provide abundant food for mice and other small mammals. This leads to an __________ in population.

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Some natural events can limit resource availability that leads to a decrease in population. Click all that are natural events:

• competition

• increase in predators

• wildfires

• droughts

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