Science 3rd Grade A11

Male tree frogs produce loud calls at night to attract mates. Some male tree frogs also perform movements, such as throat inflations and leg kicks, to get attention. How do these behaviors provide male tree frogs with advantages in surviving or reproducing?

• These behaviors help tree frogs find food.

• These behaviors warn other frogs of danger.

• These behaviors attract female tree frogs.

• These behaviors help tree frogs stay hidden.

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Some desert plants rely on seasonal rain to survive, but climate change is causing less rainfall in these regions. Scientists are studying ways to direct water to these plants to help them grow. How will providing water help these plants?

• Water will help the plants stay hydrated and grow.

• Water will make the soil too soft for plants to grow.

• Water will wash away the plants' roots.

• Water will attract animals that eat the plants.

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Bats play an important role in pollinating flowers by carrying pollen from one plant to another. Without bats, many plants would struggle to produce fruit or seeds. Which situation will most likely cause a decrease in fruit production?

• The number of bats in the area decreases.

• The plants receive extra nutrients in the soil.

• The plants grow in an area with more sunlight.

• More bats migrate to the region.

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People need iron to help their bodies produce healthy red blood cells. People can get iron from foods like spinach, red meat, and beans. Without enough iron, a person may feel tired and weak. Which situation will most likely cause a person to feel weak?

• The person eats foods rich in iron every day.

• The person avoids foods that contain iron.

• The person takes vitamins that include iron.

• The person eats beans, which are a good source of iron.

The spotted salamander lives in forests in the eastern United States. Some of the salamander’s needs include:

Damp soil to burrow in

Ponds or wetlands for laying eggs

Insects and worms for food

Protection from larger animals that eat salamanders

A company plans to build a parking lot in an area where spotted salamanders live. How will this most likely affect the salamanders?

• More salamanders will die because they will lose their burrowing and breeding areas.

• More salamanders will survive because they will find better places to lay their eggs.

• More salamanders will survive because the parking lot will attract more insects to eat.

• More salamanders will die because the pavement will provide more places for predators to hide.

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Burmese pythons are large snakes that were introduced into the Florida Everglades. They have no natural predators in the area and eat many native animals, including birds, mammals, and reptiles. What effects will most likely result from the introduction of Burmese pythons into the Everglades? Select two correct answers.

• Some native animal populations will decline as pythons eat more prey.

• The number of large predators, such as alligators, will decrease due to competition with pythons.

• Small rodents and birds will increase in number because pythons do not hunt them.

• The Everglades ecosystem will improve as pythons help control prey populations.

• The python population will continue to grow due to the lack of natural predators.

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The diagram shows two parent Golden Retrievers and their puppy.
Which statements identify traits the puppy most likely inherited from its parents?

Select the two correct answers.

• Curly fur from its mother

• A golden coat from both parents

• Short legs from its father

• Floppy ears from both parents

• A black nose from its mother

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