Living Things and Ecosystem Unit Review

When building a food chain or food web, what two questions should you ask yourself?

• What does it eat?

• Where does it live?

• What eats it?

• How might it adapt?

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If a rabbit population increases, a predator population will ​ (a)  

• increase
• decrease

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Would an increase in a rabbit population last forever?

• Yes

• No

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NGSS.MS-LS2-1

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In photosynthesis, vegetable plants use the ​ (a)   ​ from the ​ (b)   to convert air and water into ​ (c)   .

• energy
• sunlight
• sugar

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Students added the same amount and type of vegetable waste to each composter (picture). After several weeks, they noticed that the waste in composter 2 was breaking down faster than the waste in composter 1.

Which of the following changes could the students make to composter 1 so that waste breaks down more quickly?

• Drill many small holes in each side.

• Cover the top with a lid made out of wire mesh.

• Cover the top with a lid made out of plastic.

• Replace the wooden sides with thick plastic sides.

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NGSS.MS-ETS1-2

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Bacteria play an important role in the movement of matter in the students' model. Which of the following describes the role of bacteria in a composter?

• Bacteria in a composter are producers because they produce sugars.

• Bacteria in a composter are composters because they produce sugars.

• Bacteria in a composter are consumers because they recycle materials.

• Bacteria in a composter are decomposers because the recycle material.

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NGSS.MS-LS2-3

The students in Mrs. Jones' class cannot figure out why their plants are dying! The students provided their plants with sunlight, vinegar, and air. Here is a picture of their plant.

Which elements below should the students provide their plants with?

• Sunlight, baking soda, and air

• Sunlight, vinegar, and air

• Sunlight, water, and air

• Sunlight, salt water, and air

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In a food chain, how can an increase in the population of one organism impact another?

• No impact

• They become friends

• A decrease in competition

• It can increase or decrease depending on the organisms' roles

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What is a key difference between a food chain and a food web?

• One has animals, the other doesn't

• One uses sunlight, the other doesn't

• A food web represents multiple interconnected food chains

• They are the same thing

In the food chain, which type of organism is usually at the top?

• Predator

• Prey

• Producer

• Decomposer

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NGSS.MS-LS2-3