The Flow of Energy in Ecosystems

A food chain/food web is intended to show relationships in an ecosystem. What do the arrows represent?

• The direction of population migration
• Differences in dietary habits
• Progressively smaller organisms
• The direction of the energy flow

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Use the diagram to answer the question.
The Mayfly is a food source for which 3 organisms?

• Frog, Dragon Fly and snake
• Frog, trout and dragon fly
• Frog, salamander and trout
• Frog and phytoplankton

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How would a population decrease in primary consumers affect the ecosystem?

• primary producers would suddenly decrease.

• Secondary consumer population would increase.

• Secondary consumer populations would eventually decrease.

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Which of the following statements is true based on the food chain shown here?

• Snakes get energy directly through plant consumption.

• Most insects are autotrophs.

• Mice and bugs have a parasitic relationship.

• Energy from photosynthesis will eventually transfer to snake.

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Unlike plants, animals cannot make their own food. How do animals obtain the energy they need?

• Animals are able to function without energy.

• Animals eat other organisms.

• Animals absorb chemicals from their environment.

• Animals collect solar energy.

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Which of the following is a producer in the food web shown?

• decayed matter

• tadpole

• snake

• algae

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An organism that makes its own food is known as a _______.

• secondary consumer

• decomposer

• producer

• primary consumer

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According to the food web, which of the following is true about lizards?

• ants consume lizards

• lizards are not consumers

• lizards eat snakes

• lizards consume ants

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Eating both plants and animals is a characteristic of

• herbivores

• decomposer

• carnivores

• omnivores

A living thing that feeds on the wastes and remains of plants and animals is called __?

• decomposer

• community

• consumer

• population

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