1D Formative

What is the effect of removing prey from a food chain?

• All predators above them will die or suffer.

• The prey's predator will die or suffer, but everybody else should be fine.

• The prey will always, eventually, come back

• The predators population will grow

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If the mouse population becomes sick and decreases, which statement about the food web will be true?

• The grass population will decrease.

• The hawk population will increase.

• The grass population will increase.

• The wildflower population will decrease.

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NGSS.MS-LS2-1

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A population of mice lives in a barn community. A cat population has just joined the community. What will happen?

• Mouse and cat populations both go up?
• Mouse and cat populations both go down
• Mouse population goes down as cat population goes up
• Mouse population goes up as cat population goes down

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NGSS.MS-LS2-1

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Which statement best describes what would happen in this ecosystem if the phytoplankton were removed from the food web?

• Copepods and krill would fill the vacant niche.

• The number of heterotrophs would increase.

• The food web would be disrupted, and organisms would die.

• The food web would remain stable.

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Several owls live in a forest. The owls prey on mice. Hawks also prey on mice. Which might happen if several hawks move to the forest where the owls live?

• The number of owls will increase, and the number of hawks will decrease.

• The number of owls and hawks will increase.

• The number of mice will increase, and the number of owls will decrease.

• The number of owls and mice will decrease.

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NGSS.MS-LS2-1

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What happens when you remove sea otters from the ecosystem?

• Kelp forests disappears

• There are less fish

• Plant Plankton disappear

• Rainforest ecosystems change

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The diagram shows the cycling of nutrients in an ecosystem. The removal of which of the following groups would cause an immediate decrease in the amount of energy flowing through the system? 

• Producers
• Consumers
• Decomposers
• Inorganic nutrients

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Human population growth has led to a reduction in the populations of predators throughout natural ecosystems across the United States. Scientists consider the loss of these predators to have a

• positive effect, because an increase in their prey helps to maintain stability in the ecosystem

• positive effect, because predators usually eliminate the species they prey on

• negative effect, since predators have always made up a large portion of our food supply

• negative effect, because predators have an important role in maintaining stable ecosystems

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NGSS.MS-LS2-4

Which of the following is most likely to cause an increase in the croaker population?

• an increase in the anchovy population

• a decrease in the crab population

• a decrease in the bluefish population

• a decrease in the algae population

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NGSS.MS-LS2-1

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A drought has hit this grassland biome. How will this effect the rabbit population?

• The rabbits will increase in number.
• The rabbit population will stay the same.
• The rabbit population will decrease.
• The rabbit population will become extinct immediately.

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