Ecosystems and Food Webs

Some beetles break down the remains of dead animals. Some mushrooms break down the remains of dead trees. How do these actions most benefit plants?

• By returning nutrients to the soil

• By releasing oxygen into the air

• By making space for new animals

• By decreasing the population of herbivores

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Some facts about a bird called the painted redstart are listed in the box above. Which fact best describes one way this bird changes its environment to meet its needs?

• Fact 1

• Fact 2

• Fact 3

• Fact 4

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Some facts about birds called Cattle Egrets are listed below. Which of these facts best describes how these birds depends on other animals to survive?

• Fact 1

• Fact 2

• Fact 3

• Fact 4

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The table lists ways that four organisms obtain energy. Which organism obtains energy without depending on another organism?

• Oak tree

• Mushroom

• Cottontail Rabbit

• Mountain Lion

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A student observes the following activities while walking in a park. Which of these living organisms was interacting with another living organism in the environment?

• Fire ant

• Blue jay

• Bee

• Hawk

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When living things battle each other for resources, it is called

• producing
• recycling
• cooperation
• competition

An ecosystem is made up of all the ___________ and _____________ factors in an area. 

• not/without
• Limiting Factor/ Carrying Capacity
• Living/ Nonliving
• life/ biotic factor

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Two or more food chains that share links make a 

• community
• fossil
• food web

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The owl receives energy from which organisms?

• grasshopper and mouse
• mouse and rabbit
• rabbit and butterfly
• butterfly and frog

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Which organism is the top predator in this food web?

• leopard seal
• killer whale
• elephant seal
• crabeater seal

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