Science 3rd Grade Quiz A4

Birds called lyrebirds are known for imitating the sounds of their surroundings. Some lyrebirds can mimic chainsaws, car alarms, and even camera shutters. How does mimicking these sounds benefit lyrebirds?

• The birds scare away predators by making loud noises.

• The birds attract other animals to their territory.

• The birds use the sounds to attract mates.

• The birds use the sounds to communicate with other birds in their group.

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People are working to protect coral reefs by reducing pollution and overfishing. How will these actions help coral reefs?

• They will make coral reefs bigger.

• They will provide food for the coral reefs.

• They will improve water quality and help coral reefs thrive.

• They will create more space for coral to grow.

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Monarch butterflies travel thousands of miles during their migration. Some butterflies migrate to warmer climates in the winter. How does this migration benefit monarch butterflies?

• It helps the butterflies avoid predators.

• It helps the butterflies find more food.

• It helps the butterflies avoid cold temperatures.

• It helps the butterflies find new habitats to live in.

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People can protect their skin from harmful UV rays by using sunscreen, wearing protective clothing, and staying in the shade. Which situation is most likely to increase the risk of skin damage?

• The person stays indoors during the hottest part of the day.

• The person applies sunscreen every two hours.

• The person spends a lot of time in direct sunlight without protection.

• The person wears a hat and sunglasses to protect their face.

Beavers build dams in rivers to create ponds where they can live safely. A new housing development is being built near a river where beavers live. How will this development most likely affect the beavers?

• The beavers will be able to find new places to build their dams.

• The beavers will have more space to create ponds.

• The beavers will lose their habitat and may have difficulty finding food.

• The beavers will have more protection from predators in the area.

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Kudzu is a plant that was brought to the United States in the late 1800s to prevent soil erosion. However, it grows quickly and chokes out other plants. What effect is most likely caused by the spread of kudzu?

• The number of different plant species in the area will increase.

• The soil will become healthier because there are fewer plants.

• Other plants will be crowded out, and their numbers will decrease.

• The climate in the area will become cooler because of the added vegetation.

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Asian carp were introduced into the United States to control algae in ponds. However, they started eating plankton that native fish rely on. What is the most likely effect of introducing Asian carp into new ecosystems?

• The number of native fish will increase because there is less competition for food.

• The water quality will improve because the carp help control algae.

• Native fish will have less food because the carp eat plankton.

• The number of predators will increase due to the larger number of fish.

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