Investigation 2: Ecosystems and Food Webs

Which of the following are biotic factors in an ecosystem?

• rain, sunlight, and plants

• plants, animals, and bacteria

• temperature, animals, and plants

• animals, minerals in the soil, and rain

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NGSS.MS-LS2-2

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What is a producer’s job in an ecosystem?

• to make food and oxygen for animals

• to help plants grow

• to break down dead plants and animals

• to eat plants and other animals and produce carbon dioxide

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NGSS.MS-LS1-6

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Why are animals important to an ecosystem?

• They produce oxygen

• They eat bacteria

• The produce carbon dioxide

• They help break down dead plants

What is the difference between a biotic factor and an abiotic factor?

• Biotic factors include elements like weather and temperature, while abiotic factors produce carbon dioxide and oxygen

• Biotic factors are living things and abiotic factors are non-living things

• Biotic factors exist in an ecosystem, but abiotic factors do not

• Biotic factors are non-living things and abiotic factors are living things

What is an ecosystem?

• the pattern of weather that affects a particular area

• the life cycle of a plant, from seed to flower

• all living things in a particular environment, like a forest or a desert

• a community or organisms that interact with their environment

Which of the following correctly shows the cycle of biotic factors in an ecosystem?

• Bacteria produce food and oxygen, animals eat the plants, breathe the oxygen, and produce carbon dioxide, and plants break down dead animals and produce minerals

• Plants produce food and oxygen, bacteria eat the plants, breath the oxygen, and produce carbon dioxide, animals break down dead plants and produce minerals that help plants grow

• Plants produce food and oxygen, animals eat the plants, breathe the oxygen, and produce carbon dioxide, and bacteria break down dead plants and animals and produce minerals that help plants grow

• Animals produce food and oxygen, bacteria eat the plants, breath the oxygen, and produce carbon dioxide, and plants break down dead animals and produce minerals

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

What would happen if there were no abiotic factors in an ecosystem?

• Plants would be unable to grow and produce oxygen for the animals

• Animals would grow and flourish

• The ecosystem would get too much rain

• Bacteria would become the consumer instead of the decomposer

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Which of the following do omnivores eat?

• plants only

• plants and meat

• meat only

• they make their own food

What is a food web?

• a community of animals and plants that interact with their environment

• a web created by a spider to trap its food

• a complex network of food chains in an ecosystem

• one line of different levels of consumers in an ecosystem

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NGSS.MS-LS2-2

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Which is a characteristic of animals that are in the same food web?

• They are in the same ecosystem

• They only eat plants

• They only eat meat

• They are all decomposers