LS2-4 Review

A population of deer recently increased in size. Which most likely could have caused the deer population to increase?

• A disease was spreading.

• Their habitat was destroyed.

• Food sources were hard to find.

• Their predators were disappearing.

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Bluebirds, beetles, wood ducks, squirrels, and owls all will nest in holes in hollow trees. A food web that includes these animals is shown. If many hollow trees were removed from the area, which would most likely increase?

• competition for food between squirrels and owls

• competition for food between beetles and squirrels

• competition for nest sites between beetles and owls

• competition for nest sites between bluebirds and wood ducks

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Which best describes the effect on another population in the food web below if nearly all of the field mice are removed?

• The number of lynx will increase.

• The amount of grass will decrease.

• The amount of seeds will increase.

• The number of ferrets will decrease.

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In 1989, an oil spill off the coast of Alaska led to a decline in the populations of many organisms. Which of the following populations was most likely affected by the drop in populations of fish, otters, and seals?

• deer

• eagles

• frogs

• snakes

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A rainforest area is experiencing a severe drought. As a consequence, the insect population has decreased. What will the insect-eating birds most likely do as a result of the drought?

• stop searching for food until it begins to rain

• begin reproducing to increase population

• move to a new area to find food

• start the process of hibernation

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Bald eagles were once in danger of extinction. Since being protected by laws, the bald eagle population has grown. Bald eagles eat a variety of organisms including snakes. How did the increase in the population of bald eagles most likely affect snakes living in eagle habitats?

• The increase reduced the number of snakes.

• The increase forced the snakes to change habitats.

• The increase made the snakes find new food sources.

• The increase caused the snakes to develop new traits.

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Look at the oval below.

• Parts of a Food Web

• Levels of a Food Chain

• Parts of an Ecosystem

• Levels of an Energy Pyramid

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A fishing technology company invents a new kind of net that dramatically increases the catches of squid from the ocean. Based on the food chain provided, which is the most likely effect this advanced fishing technology will have on ocean organisms?

• a decrease in fish numbers

• an increase in whale numbers

• a decrease in seal numbers

• an increase in plankton numbers

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