7.L.1.3

What might most likely happen if an ecosystem lost all its decomposers?

• Consumers would not be able to obtain food and their populations would quickly decrease.

• Nutrients would remain in waste products and remains of dead organisms, and would not be recycled.

• The food web would gain nutrients because there would be no organisms breaking them down or consuming them.

• Producers would multiply until they reached the carrying capacity of the habitat.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Think of all the components that contribute to the flow of energy and matter in a food web. Which of the following groups forms the base of the food web?

• consumers

• decomposers

• producers

• scavengers

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Why are there so few third-level consumers and how does this fit with the energy pyramid?

• because there is less energy available at the bottom of the pyramid

• because of the energy and heat loss at each level of the pyramid

• because they use the most energy competing for food in the pyramid

• because they have the fewest sources of food for energy in the pyramid

Tags

NGSS.MS-LS2-3

This food chain shows some of the plants and animals that could be observed in a meadow ecosystem. What is the source of energy for the snake?

• the toad

• the owl

• the beetle

• green plants

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the primary source of energy used by producers during photosynthesis?

• thermal energy from the sun

• light energy from the sun

• chemical energy from food and oxygen

• chemical energy from carbon dioxide and water

Tags

NGSS.MS-LS1-6

What is the primary role of decomposers in an ecosystem?

• to control the population of producers and consumers

• to compete with producers for energy and other resources

• to provide a source of energy for the producers in the ecosystem

• to recycle energy and materials from dead producers and consumers

Tags

NGSS.MS-LS2-3

Ecosystems have producers, decomposers, and consumers. Carnivores and omnivores are both consumers in an ecosystem. Which of the following is a characteristic of omnivores that makes them DIFFERENT from carnivores?

• Omnivores eat only plant materials.

• Omnivores always eat live animals

• Omnivores eat both dead plants and animals.

• Omnivores are able to produce their own food.

As you move up the levels of an energy pyramid, how does the energy available to each level compare?

• There is much more energy available at higher levels.

• There is the same amount of energy available for each level.

• There is a little less energy available at lower levels.

• There is much less energy available at higher levels.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

All organisms take energy from their environment. Every organism needs this energy in order to grow and reproduce. How do producers get energy?

• They obtain energy by eating plants, bacteria, and algae.

• They extract chemical energy from decaying organic matter.

• They extract energy from the chemicals in soil, air, and water.

• They capture energy from sunlight and manufacture their own food.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Each organism has its own role in an ecosystem. Organisms can be producers, consumers, or decomposers. Which of these organisms can be classified as a decomposer?

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