Ecosystem Check In Review

Which best explains what happens to the available energy in an ecosystem as it flows from a lower trophic level to a higher trophic level?

• Energy increases because there is an increase in the types of organisms in the higher trophic levels

• Energy decreases because organisms in higher trophic levels need less energy than those in lower trophic levels.

• Energy remains stable because the trophic levels of an ecosystem are always in a balanced state.

• Energy decreases because some of the energy is used during the life processes of organisms.

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Which is a benefit of planting different crops on the same field during the year?

• It increases the size of vegetables

• It adds iron to the soil.

• It increases water runoff

• It slows down the loss of soil minerals.

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NGSS.MS-LS1-5

What is the main function of stomata in the leaves of plants?

• gas exchange

• photosynthesis

• water absorption

• protection

If people plant trees in areas where trees were removed due to deforestation, how will the environment most likely be affected?

• It will decrease the biodiversity in the area.

• It will decrease the effects of flooding in the area

• It will increase the risk of potential landslides in the area.

• It will increase the atmospheric carbon dioxide levels in the area.

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

This graph shows the relationship between predator and prey over several years. Which best explains why the predator/prey population changes?

• Changes occur because of seasonal changes.

• Increases in the prey population cause a decrease in the predator population.

• Increases in the predator population result in an increase in the prey population.

• Decreases in the predator population result in an increase in the prey population.

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Which is the best way to protect bald eagles from extinction?

• create clones of the most fit eagles

• provide them more food

• protect their natural habitats

• increase natural predators

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NGSS.MS-LS2-1

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Which trait is least likely to be affected by environmental conditions?

• Weight

• Skin color

• Blood type

• Intelligence

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NGSS.MS-LS1-5

In corn plants, tallness is dominant over shortness. A corn plant which is heterozygous tall is crossed with a plant which is homozygous tall. What percentage of the offspring will be tall?

• 25%

• 50%

• 75%

• 100%

A population of deer moves to an area where another population of deer live. Since the deer are the same species, they are able to mate. What will most likely happen to the combined deer populations if there are no limits on resources such as food and water?

• There will be an increase in disease in the population.

• The number of deer born into the population will decrease.

• The population of deer will exhibit more negative physical characteristics.

• Genetic variation will increase within the population.

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NGSS.MS-LS4-4

Which provides the best evidence that animals have evolved from simple to more complex forms?

• fossil evidence

• analogous structures

• vestigial structures

• radioactive dating

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NGSS.MS-LS4-1

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