Ecosystem

A population is made up of organisms that 

• are made up of many different species
• are all members of the same species
• represent several different levels in an energy pyramid
• represent at least three links in a food chain

which of the following changes in a limiting factor could reduce the size of a fish population in a pond?

• a decrease in the number of predators
• a decrease in herbicide use on the shore
• a decrease in the food supply 
• an increase in the area the fish can live in

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• water
• fish
• sunlight
• rocks

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this time pick an abiotic factor

• fish
• plant
• heron
• rocks

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A behavior or a physical characteristic that helps an organism survive and reproduce is called ___.

• a mutation
• a selection
• a variation
• an adaptation

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A heavy rainstorm washed fertilizer from a farm field into a pond, causing an increase in the amount of algae.  What is the best explanation for this growth?

• The pond system contained too few consumers.
• The runoff contained a nutrient for the pond ecosystem.
• The pond system included few producers.
• The aldae were living in the runoff before it entered the pond.

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During which part of the water cycle does water return to Earth?

• evaporation
• runoff
• condensation
• precipitation

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During the water cycle, how does water get up into the atmosphere?

• evaporationand transpiration
• transpiration and precipitation
• evaporation and precipitation
• frenchfries and ketchupation

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Which is an example of commensalism?

• fleas and dogs
• hummingbirds and flowers
• lions and rabbits
• birds and the trees they nest in

which is an example of mutualism?

• impalas and birds that eat ticks
• birds and the trees they nest in
• tapeworms and their host
• tigers and the monkeys they eat

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