Biodiversity

Which of the following situations is MOST HARMFUL to an ecosystem's food web or food chain?

• introduction of a similar producer
• loss of one of the top consumers
• increase in the population of producers
• disease killing the producers

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The graph above shows the variation in the deer population in the Kaibab Plateau from 1905 to 1939. Between 1907 and 1923, the natural predators of deer were eliminated from the area by hunters. What was the most likely reason for the decline in the deer population after 1924?

• The deer stopped competing for resources because they had no predators.
• The increased number of deer led to increased competition for resources.
• A large number of deer left the region in search of new predators.
• The removal of predators caused fewer resources to be available to the deer.

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NGSS.MS-LS2-1

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In a particular habitat, owls eat mice and mice eat grass. If the owl population suddenly grows, then most likely

• the number of mice will decrease and the amount of grass will not change.
• the number of mice will increase and the amount of grass will increase.
• the number of mice will increase and the amount of grass will not change.
• the number of mice will decrease and the amount of grass will increase.

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NGSS.MS-LS2-1

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All living and nonliving things that surround an animal are part of its

• food chain
• life cycle
• atmosphere
• habitat

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Deer usually travel in groups of 2-3 sometimes more. How does staying in a group increase one deer’s chance to pass on his genes to the next generation?

• It increases the deer’s chances of survival.
• It protects the deer from the cold.
• It allows the deer to eat.
• It gives the deer time to think.

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Which habitat exhibits the greatest biodiversity?

• A habitat with 15 different species with about 300 individuals each
• A habitat with 10 different species with about 75 individuals each
• A habitat with 4 different species with about 150 individuals each
• A habitat with only one species with about 2000 individual

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NGSS.MS-LS2-1

What is the MOST likely consequence if a fungal disease killed the grass in this WOODLAND ECOSYSTEM?

• Only the rabbits would be affected, because they are the ones who eat the grass.
• The blueberry bush would begin to grow wild, because it would have more space to grow.
• Nothing would happen; the animals would eat something else.
• The ecosystem would most likely be disrupted, because the grass is one of its primary producers

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NGSS.MS-LS2-1

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Currently sharks are on a rapid decline due to overfishing. If sharks go extinct will this affect the biodiversity of the ocean?

• No, sharks are not important.
• No, sharks will only affect the seal populations.
• Yes, it will disrupt the entire food chain in the ocean.
• Yes, but only a little.

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Some students are studying a vacant city lot as a small ecosystem. Which of the following yields the most information for evaluating the biodiversity of this ecosystem?

• identifying all of the species found living in the ecosystem
• testing the speed of decomposition of organic matter in the ecosystem
• creating a food-web diagram among key species in the ecosystem
• observing the feeding habits of the insect predators in the ecosystem

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NGSS.MS-LS2-5

How can humans best help an endangered species avoid extinction?

• they can feed the animals
• they can put the animals in a zoo
• they can protect the animal’s habitat
• they can take the animal to new habitats

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