Ecology Test 1 Review

1. Which is an abiotic factor that MOST limits the number of frogs living in a pond?

• the color of the water

• the number of predators

• the temperature of the water

• the populations of producers

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An aquatic food web is shown. If acid rain causes a decrease in the number of mayfly nymphs, which population will decrease the MOST in number?

• trout

• frogs

• birds

• snails

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In a forest ecosystem, a food chain might look like this. If the green plants are destroyed in a forest fire, which short-term effect will this have on the organisms in this food chain?

• Most mountain lions will leave the area.

• Rabbits will obtain their energy from coyotes.

• There will be fewer rabbits for coyotes to eat.

• There will be more coyotes for mountain lions to eat.

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The barred owl has been moving into the habitat of the spotted owl. This could lead to a reduction in the spotted own population if the...

• two owl species cannot interbreed.

• barred owl is a secondary consumer.

• barred owl is better adapted to habitat changes.

• spotted owl is dependent on local producers.

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Which BEST describes the effect on another population in the food web 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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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 are 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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Changes to abiotic factors in an environment can impact biotic factors. Which statement is the BEST example of this situation?

• Heavy rainfall increases soil erosion.

• Melting glaciers cause sea levels to rise.

• Cold temperatures cause rocks to weather.

• Drought conditions increase competition among consumers.

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Mice, rabbits, bobcats, and squirrels all live in a brush ecosystem. Which animals would have the MOST difficult time surviving if the population of the other three animals continued to decrease?

• mouse

• squirrel

• bobcat

• rabbit

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Which of these is an abiotic element of a desert ecosystem?

• sand

• cactus

• lizard

• scorpion

Which of these organisms is a producer in a marine ecosystem?

• fish

• gull

• algae

• worm

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