L.17.2

Which of these statements best describes a niche in an ecosystem?

• The role of a species in its ecosystem.
• The way a species interacts with other species.
• The way a species consumes energy.

The image shows a food web in a Florida ecosystem, with arrows pointing to the consumer. A new organism moves into the ecosystem. It eats pine borers. Which animals in the food web will compete with the new organism for food?

• squirrel and salamander
• fox and hawk
• kinglet and fox
• salamander and kinglet

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NGSS.MS-LS2-1

Which is a predator/prey relationship?

• a hawk eating a mouse
• a fish layin eggs in a stream
• a mistletoe plant living on a tree
• a plant using sunlight to make food

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NGSS.MS-LS2-2

Which of the following organisms is a producer?

• a fox
• a colony of ants
• a sunflower
• a mushroom

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How would one describe the role or a producer?

• They make their own food using energy from the sun, which consumers eat

• they are never consumed by herbivores

• a producer breaks down the dead organisms in an ecosystem

• producers are most likely to eat other producers and be predators.

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NGSS.MS-LS2-3

Three species of robin live in a park. If the red breasted robin's start moving into the speckled robin's territory, what would be the likely result?

• The red breasted robin would fight and compete with the speckled robin for food and shelter.

• The speckled robin would leave without a fight.

• Both species of robin would go extinct due to disease.

• A third species of robin would come in and attempt to live there too.

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Which of these options describe the role of a decomposer in an ecosystem?

• Decomposers break down dead plants and animals, returning the nutrients back to the soil and water.
• Decomposers hunt and eat consumers to control the population.
• Decomposers are most likely to be found at the beginning of the food web, since they are producers.
• Decompsers are organisms that are stricly herbivorous

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NGSS.MS-LS2-3

Apex predators are not very common in food webs and ecosystems. Most of the organisms in a food web are producers, like grass and other plants. Why are there so few apex predators in foodwebs?

• Very little energy is passed on as it moves through a food chain, only about 10%. Most is lost as heat.
• The apex, or weak, predaors are not capable of producing many offspring.
• Apex predators are not top predators. They are poor hunters.
• Apex predators cannot compete with primary consumers for resources.

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In this food web, which organism is the producer?

• the lion
• The goat
• the green plant
• the rabbit

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Apex, or quaternary, predators eat tertiary consumers. Tertiary consumers eat secondary consumers, who eat primary consumers, who eat producers. In the food web, which organisms are secondary consumers?

• heron and frog
• frog and mosquito
• alligator and orchid
• turtle and heron

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NGSS.MS-LS2-3