Ecosystems Review: Question Preview (ID: 20084)

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Which is not an example of interaction in an ecosystem?
a) Caves and holes in the ground can provide shelter or dens for coyotes.
b) Water from a lake evaporates, forms clouds, and rains back down to earth.
c) Beavers need to live near water and trees.
d) Bees pollinate flowers, and flowers provide food for bees.

Which are examples of nonliving elements of an ecosystem?
a) rocks, trees, rivers, fish, soil
b) soil, bacteria, sunlight, lakes, caves
c) rocks, soil, lakes, sunlight, rain
d) rivers, streams, grass, mountains, sunlight

What are primary consumers?
a) organisms that eat plants
b) organisms that eat plants and animals
c) organisms that get energy from the sun
d) organisms that eat dead organisms

What trophic level is a maple tree?
a) primary consumer
b) producer
c) decomposer
d) herbivore

Where does all food energy come from?
a) the moon
b) plants
c) bacteria
d) the sun

What happens if some of the top consumers are removed from an ecosystem, like the wolves in Yellow Stone?
a) The populations of decomposers will decrease and there will be too many dead organisms.
b) The population of lower level consumers will decrease and there won't be enough organisms to eat the plants.
c) The population of both producers and lower level consumers will increase.
d) The population of lower level consumers will increase and they will eat too many of the producers.

What is a symbiotic relationship?
a) A relationship between two organisms of different species where each organism benefits from the partnership.
b) A relationship between two organisms of different species where only one organism benefits from the partnership.
c) A relationship between two organisms of different species where one organism benefits and the other is harmed.
d) A relationship between an organism and the nonliving parts of its habitat.

Why are there fewer tertiary consumers than producers in an ecosystem?
a) They often hibernate so they don't need as much food.
b) They need to eat less because each tropic level has more energy.
c) Tertiary consumers often fight and kill each other for food.
d) They need to eat a high number of other consumers to get enough energy; energy is lost at each trophic level.

The organisms below are all decomposers except
a) Worms
b) Mushrooms
c) Moss
d) Shrimp

Bacteria are an important part of a food web because
a) They break down dead plants and animals which returns nutrients to the soil.
b) They produce food for plants.
c) They can make an animal sick so that it dies.
d) They provide energy for herbivores.

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