Changes

When trees develop leaves in the spring, changes occur on the forest floor. Why does the development of leaves cause changes on the forest floor?

• Rainfall increases

• Sunlight is reduced

• Wind speed increases

• Animal migration is stopped

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NGSS.MS-LS1-6

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What is a likely consequence of cutting down rainforests?

• A decrease in the amount of air pollution on Earth

• An increase in the number of plants living on Earth

• A decrease in the variety of organisms living on Earth

• An increase in the number of arctic ecosystems on Earth

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS2-5

A science teacher bought some tomatoes that were still green and not yet ripened. He placed half of them in the refrigerator and half on a kitchen table at room temperature. After 4 days, the tomatoes in the refrigerator were still green, while those on the table were red and ripe. Which of the following is the BEST reason for the difference in ripening?

• Tomatoes need sunlight to ripen

• There was not enough air in the refrigerator

• The tomatoes placed in the refrigerator were just bad

• Tomatoes do not ripen well at cold temperatures

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NGSS.MS-LS1-5

If disease removed a species of plant from a food web, how would that ecosystem MOST LIKELY be affected?

• All of the plants in the ecosystem would become extinct

• The organisms that eat the plant would become extinct

• Consumers of the plant would have a smaller food source

• Producers in the ecosystem would have a smaller energy supply

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A certain type of wildflower grew in a sunny meadow. Over several years, nearby trees formed a shade canopy over the entire meadow. Many years later, the wildflowers no longer grew in the meadow. Which factor directly led to the extinction of this population of wildflowers?

• The building of large cities

• Pollution from nearby homes

• Overpopulation of plant-eating organisms

• A change in the wildflower’s habitat

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NGSS.MS-LS1-5

NGSS.MS-LS2-4

A woodland is cut down so a shopping center and many new houses can be built over the next two years. What will MOST LIKELY occur in the local ecosystem in the next five years?

• Wildlife will compete less for food

• More species of birds will live there

• Water levels will be lower when it rains

• Rain will wash more pollution into creeks

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NGSS.MS-ESS3-4

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

The diagram shows an area before and after a housing development was built there. Tall pine trees grow very well in East Texas. However, these trees do not do well in parts of West Texas. Which of the following is MOST important in determining where a plant can grow and survive?

• Wind

• Climate

• Tides

• Sunshine

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

What is the primary reason for the change in color of leaves during autumn?

• Chlorophyll breakdown

• Increased sunlight

• Higher temperatures

• Increased rainfall

Which of the following changes is a chemical change?

• Melting ice

• Burning wood

• Boiling water

• Breaking glass

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

How does the change in temperature affect the solubility of most solids in water?

• Increases solubility

• Decreases solubility

• No effect

• Solubility becomes zero

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NGSS.MS-PS1-4