Ecosystems: Succession & Basics

Look at the diagram below of a food web. The arrows show the direction of energy flow. Each arrow points from the organism that is consumed to the organism that consumes it. Use the information in the food web to answer the question.

• hey use sunlight to make their own food.

• They give off oxygen for animals to breathe.

• They provide camouflage for small animals

• They make nutrients available to plants.

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Examine the food chain below. What will happen if a drought causes the population of grass to decrease?

• The population of decomposers will decrease because there are less organisms dying.

• The population of owls will not be affected because they are predators who do not eat grass.

• The population of mice will decrease because there will be less food available due to the drought.

• The population of grasshoppers will increase because they will find a different, better food source.

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Examine the food web below. ​Matter and energy both move through this food web. Which important organism is missing from this food web?

• A consumer is missing. Consumers compete with organisms for food and other resources.

• A predator is missing. Predators are important because they maintain the population numbers in the organisms they eat.

• A decomposer is missing. Decomposers break down dead plants and animals recycling matter back into the ecosystem.

• A producer is missing. Producers are important because they convert light energy into a form that the other organisms can use.

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A forest area is being used for a new housing development. Most of the trees have been removed to make room for the new houses. Predict the impact that this will have on the birds in the area.

• The bird populations will stay the same because humans love birds.

• The bird populations will decrease because humans see them as pests.

• The bird populations will increase because humans do not interfere with wild animals.

• The bird populations will decrease due to competition for resources such as food and nesting sites.

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If the population of frogs decreased, then what would increase?

• foxes

• hawks

• caterpillars

• snakes

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​Based on the above graph, what were the peak years for the zebra mussel population?

• 1992, 1997, 2007

• 1997, 2001, 2006

• 1992, 2008

• 1992, 1994, 1996, 1998, 2000, 2002, 2004, 2006, 2008

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