Science 3rd Grade A9

Male crickets chirp by rubbing their wings together. The faster they chirp, the more likely they are to attract a mate. How does chirping provide male crickets with an advantage in reproducing?

• Chirping helps them find food.

• Chirping warns other insects of danger.

• Chirping attracts female crickets.

• Chirping helps them blend into their environment.

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NGSS.MS-LS1-4

Farmers grow crops in areas with rich soil. However, heavy rainfall can wash away the top layer of soil, which makes it harder for plants to grow. How can planting trees near farmland help crops grow better?

• Trees take water away from the crops.

• Trees block sunlight that crops need to grow.

• Tree roots help hold the soil in place, preventing it from washing away.

• Tree branches create strong winds that remove harmful insects from the crops.

Bats help many fruit plants reproduce by carrying pollen from one flower to another. Without bats, these plants would struggle to produce fruit. Which situation will most likely cause a decrease in fruit production?

• More bats move into the area.

• The plants receive plenty of water and nutrients.

• The bat population in the area decreases.

• More fruit plants are grown in the area.

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NGSS.MS-LS2-1

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People need iron in their diets to help their bodies produce healthy blood cells. Iron can be found in foods like red meat, spinach, and beans. Which situation will most likely cause a person to become weak and tired?

• The person eats iron-rich foods every day.

• The person avoids foods that contain iron.

• The person drinks orange juice, which helps absorb iron.

• The person eats a balanced diet that includes beans and vegetables.

The eastern box turtle lives in forests and grassy fields. These turtles need: - A safe place to lay eggs - Leaf piles to hide in - Warm, damp areas to search for food - Protection from predators like raccoons and foxes A new highway is being built through a forest where eastern box turtles live. How will this most likely affect the turtles?

• More turtles will die because they will have fewer places to hide.

• More turtles will die because new predators will move into the area.

• More turtles will survive because they will have more space to roam.

• More turtles will survive because they will have an easier time finding food.

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NGSS.MS-LS2-1

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Lionfish are a non-native species that were accidentally introduced into the Atlantic Ocean. These fish have sharp, venomous spines and reproduce rapidly. They eat large amounts of smaller fish, including species that help keep coral reefs healthy. Which effects will most likely be caused by the introduction of lionfish into new ecosystems? *(Select two correct answers.)*

• Some native fish populations will decrease.

• The coral reef ecosystem will become healthier and more balanced.

• Native predators will increase in number as they eat more lionfish.

• The population of smaller fish will decline as lionfish consume them.

• The water will become clearer as lionfish reduce algae-eating fish populations.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The diagram shows two parent dogs and their puppy. Which traits did the puppy most likely inherit from its parents? Select the two correct answers.

• Floppy ears from its mother

• A straight tail from its father

• A curly tail from its mother

• A spotted fur pattern from its father

• A solid fur color from both parents

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NGSS.MS-LS3-2

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