Food webs

Which group is not represented in the food web?

• producers

• primary consumers

• secondary consumers

• decomposers

What do the arrows in the food chain indicate about the flow of energy in an ecosystem?

• Energy is continuously recycled by the organisms in an ecosystem.

• Energy flows in one direction in an ecosystem, from producers to consumers.

• More of the available energy in an ecosystem is given to large animals than to small animals.

• Organisms at the end of the food chain receive more energy than those at the beginning.

Which group is not represented in the food web?

• producers

• primary consumers

• secondary consumers

• decomposers

What do the arrows in the food chain indicate about the flow of energy in an ecosystem?

• Energy is continuously recycled by the organisms in an ecosystem.

• Energy flows in one direction in an ecosystem, from producers to consumers.

• More of the available energy in an ecosystem is given to large animals than to small animals.

• Organisms at the end of the food chain receive more energy than those at the beginning.

In this energy pyramid, which organism would most likely be in level 2?

• bird

• fox

• caterpillar

• tree

Which one of the following is true of grass in an ecosystem?

• It converts oxygen to glucose.

• It produces carbon dioxide from oxygen and water.

• It produces glucose from carbon dioxide and water.

• It converts water to energy.

How would the removal of earthworms from the food chain affect the other organisms?

• The number of bass will increase.

• The number of crayfish will decrease.

• The crayfish will get their energy directly from the sun.

• The number of bass and ospreys (bird) will increase.

Interactions in an ecosystem result from the transfer of matter and energy from producers to consumers and eventually decomposers. What are the forms of energy transfer from numbers 1 through 4?

• Chemical energy to chemical energy

• Light energy to chemical energy

• Chemical energy to heat energy

• Heat energy to mechanical energy

The diagram shows part of an aquatic food web for a stable lake ecosystem in Connecticut. What is the source of energy for the algae?

• waves

• sunlight

• bacteria

• rotifers, water fleas and tadpoles

Suppose that a new predator of the rabbit migrated to this ecosystem. What is the most likely initial effect on the other organisms?

• More competition among the mice for food

• More competition among the hawks for food

• Less competition among snakes for food

• Less grass available for food