Ecosystem Energy Flow and Food Webs

What is the main direction of energy flow in an ecosystem?

• From consumers to producers

• From decomposers to producers

• From primary producers through various consumers

• From carnivores to herbivores

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What is a food chain?

• A group of animals living together

• A series of organisms in which energy is transferred from one organism to another

• A type of plant found in the ocean

• A web of all the plants in an ecosystem

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What are primary producers in the Pacific Ocean and other aquatic ecosystems often called?

• Zooplankton

• Carnivores

• Phytoplankton

• Herbivores

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What does the illustration in Figure 3-4 show?

• The migration patterns of birds

• The feeding relationships within a marsh ecosystem

• The water cycle in a marsh

• The process of photosynthesis

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Which organism in the food web is classified as a primary producer?

• Algae

• Alligator

• Panther

• Vulture

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According to the food web, which animal is a carnivore?

• White-tailed deer

• Grass shrimp

• Panther

• Algae

What role do detritus, bacteria, and associated fungi play in the food web?

• Herbivore

• Decomposer

• Omnivore

• Carnivore

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If the population of algae decreased significantly, which group of organisms would be affected first in the food web?

• Vultures

• Grass shrimp and worms

• Alligators

• Panthers

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Using the food web, explain what might happen to the panther population if the white-tailed deer population decreased.

• Panther population would increase due to more food

• Panther population would decrease due to less food

• Panther population would stay the same

• Panther population would become omnivores

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What role do decomposers play in food webs?

• They convert dead material into detritus and release nutrients.

• They are always primary producers.

• They only eat living plants.

• They are top predators in the food web.

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