4th Grade - Science - Ecosystems, Food Chains, & Food Webs

Which is the initial source of energy in most ecosystems?

• sunlight

• decomposers

• nutrients in soil

• oxygen in the air

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NGSS.MS-LS2-3

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Marc gets a pet rabbit for his birthday. He looks online and learns that rabbits are herbivores. Which of the following foods might he feed his new pet?

• meat scraps

• lettuce

• bacteria

• dead insects

Carla wants to show how living things get energy. Which sequence is correct?

• Decomposer -> Consumer -> Sunlight -> Producer

• Consumer -> Sunlight -> Producer -> Decomposer

• Producer -> Decomposer -> Producer -> Consumer

• Sunlight -> Producer -> Consumer -> Decomposer

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NGSS.MS-LS2-3

The picture below shows some animals you can find in grassland food chains. Which animal is the carnivore?

• 1 - squirrel

• 2 - mouse

• 3 - snake

• 4 - rabbit

An ecosystem includes this food chain.

pine seed -> mouse -> snake -> hawk

What would happen if all the mice died from a disease?

• The snakes would eat pine seeds instead of mice

• The producers would stop making food

• The population of snakes would decrease

• The population of snakes would increase

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A new shopping center was built on a vacant lot. The table shows the numbers of plants before and after construction. Which of these statements is true based on these data?

• Humans did not change the environment

• There were fewer total plants before the shopping center was built

• There were more kinds of plants before the shopping center was built.

• There were more kinds of plants after the shopping center was built.

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NGSS.MS-LS2-1

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What will most likely occur if wolves disappear from Isle Royale?

• Moose populations will stabilize

• Moose populations will decrease

• The diversity of plants will increase

• Balsam firs trees will become rarer

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NGSS.MS-LS2-1

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A new highway is planned to replace a pond habitat where a frog population lives. How will this change most likely affect the frog population?

• The frog population will double

• The frog population will increase

• The frog population will decrease

• The frog population will not change

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Emily is studying animals that live in marshes. She makes the following graphs to show how the number of fish and marsh birds changed in a certain area over time. What most likely happened when the number of fish was highest?

• The bird population began to decrease

• The birds moved away for lack of food

• The fish population continued to increase

• The bird population increased because there was more food

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NGSS.MS-LS2-3

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Organisms that break down wastes and the remains of dead organisms are called

(a)  

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