ecosystem review quiz

A physical disruption to an ecosystem occurred when a new store was built were a forest and grassland were. Which of the following would provide evidence that the addition of the store to this forest affected populations?

• The amount of water taken in by grassland and tree roots will affect the flooding of the area.

• The trees that were not cut down during the construction of the store continued to grow and other trees were added around the store.

• There were fewer species of nesting birds living in the forest and fewer small animals like rabbits grazing in the field.

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The Ellyn beaver rely on spring rains to rise river banks so they can create their homes and get enough food. This spring rain levels have been low. Which of the following observations would provide evidence that the population of Ellyn beaver was affected by a change in the environment?

• Ellyn beavers will eat trees more because they are nervous about the lack of water causing more river erosion.

• All beavers will just migrate south were there is always more water.

• Fewer Ellyn Beavers will build nests in the river and the population might go down.

• Birds will decrease in population as the beaver starts eating their food sources.

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A change in biodiversity can affect…

• Plant life in a region
• Animal life in a region
• Humans
• Oceans/ fresh water
• All of the above

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Define Dynamic

• The ability to recover from a disturbance

• Constant change or progress

Define Ecosystem

• A group of individuals of the same species

• All the biotic and abiotic factors of an environment

• Constant change or progress

Define Population

• A group of individuals of the same species

• Constant change or progress

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Biotic factors

• soil

• plants & bacteria

• temperature

• water

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An increase in algae does what to the ecosystem?

• Blocks out the sun from lower plants so there is not enough oxygen for fish and cost more to make save drinking water.

• Blocks out the sun from lower plants so there is too much oxygen for fish and biotic factors

• only affects abiotic factors

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A _________________habitat has many different species and is better prepared to recover from a disaster or pest infestation.

• Monoculture
• Polyculture

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Changes to an ecosystem’s biodiversity can have a direct effect on humans because humans –

• inhabit all areas of the Earth’s ecosystems.
• use minerals from the ground to make things
• rely mostly on solar power for energy.
• depend on the Earth’s natural resources.

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