Living Environment

Why is the flow of energy within a food web complex?

• Most organisms are consumed by more than one species of organisms.

• The usable energy decreases with each subsequent lower feeding level.

• The greatest amount of energy lies at the higher-level consumer.

• Most organisms eat only one type of food within their own ecosystem

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NGSS.MS-LS2-3

The diagram is of a food web. The arrow between the ferns and the insects represents the

• fact that the ferns and the insects required the same nutrients.

• energy in the ferns that is being transferred to the insects.

• the movement of the ferns into the insects ecosystem.

• nutrients in the insects flowing to the ferns

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NGSS.MS-LS2-3

A disease kills an organism that is a secondary consumer in a food web, and the organism decays. What is the next thing that happens to the energy in the organism's body?

• It is transferred to producers.

• It is transferred to decomposers.

• It is transferred to other secondary consumers.

• It is transferred to tertiary consumers.

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The image shows a food web. Which best describes the only part of the food web that is not living and provides the main source of energy?

• Sun

• Mushroom

• Seeds

• Grasses

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The diagram models a desert food web. Which of the following shows a correct energy food chain for this food web?

• Snakes → Desert mice → Cottontail rabbits → Cactus plants

• Gambel's quails → Cholla plants → Fungi → Bobcats

• Cactus plants → Desert mice → Snakes → Hawks

• Scorpions → Bacteria → Hawks → Snakes

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NGSS.MS-LS2-3

The diagram is of a food web. Select three organisms that pass energy to the primary consumers

• ferns

• trees

• insects

• rodents

• small leafy plants

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NGSS.MS-LS1-6

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The diagram is of a food web. Ferns get their energy from:

• trees

• insects

• the Sun

• Earth

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NGSS.MS-LS1-6

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Read the passage about the food web: Food webs show a what-eats-what relationship in nature. A food web includes producers, decomposers, first-level consumers, second-level consumers, and third-level consumers. All of these organisms must rely on one another for the transfer of matter and energy through the food web. Matter is not only transferred from one organism to the next, it is also restored to the environment for future use. What would most likely happen if the decomposers were removed from the food web?

• There would be more energy to pass around.

• The consumers would have more food to eat.

• There would be less competition for animals that rely on plants for food.

• The decaying matter would not be returned back into the environment

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NGSS.MS-LS2-3

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What is the original source of almost all the energy in Earth's ecosystems?

• carbohydrates

• sunlight

• water

• starch

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During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to drink from a pond on a farm. What is the most probable explanation for this behavior?

• It needs to find different foods to eat.

• An abiotic factor in its environment has changed.

• It is looking for a mate.

• A biotic factor in its environment has changed.

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NGSS.MS-LS2-1

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