Explicit Central Idea
Bats hunt at night when it is too dark to see clearly. They send out high-pitched sounds that bounce off objects and return as echoes. These echoes help bats locate insects and avoid crashing into trees or buildings.
A. Bats hunt only at night.
B. Echoes help bats locate insects and avoid crashing into objects.
C. Trees and buildings are dangerous to bats.
D. Bats make high-pitched sounds.
B. Echoes help bats locate insects and avoid crashing into objects.
What central idea is suggested in this paragraph?
Many animals depend heavily on their eyesight to learn about the world around them. However, bats and dolphins are often successful in places where visibility is poor. By using echoes, these animals can still locate food and avoid obstacles.
A. Most animals depend on their eyesight.
B. Bats and dolphins live in places with poor visibility.
C. Food and obstacles can be difficult to see.
D. Echolocation helps bats and dolphins overcome challenges when sight is not reliable.
D. Echolocation helps bats and dolphins overcome challenges when sight is not reliable.
Which TWO details best support the central idea that echoes help bats find food and avoid obstacles?
The sounds bats produce bounce off insects and nearby objects. The returning echoes help bats locate prey and avoid obstacles while flying.
A. The sounds bounce off insects and nearby objects.
B. The returning echoes help bats locate prey and avoid obstacles.
C. Bats produce sounds.
D. Bats fly.
✅ A. The sounds bounce off insects and nearby objects.
✅ B. The returning echoes help bats locate prey and avoid obstacles.
Which detail best supports the central idea that bats use echolocation to find food?
Bats send out sounds that bounce off insects. The returning echoes help bats determine where insects are flying.
A. Bats send out sounds.
B. The returning echoes help bats determine where insects are flying.
C. Insects can fly.
D. Bats are mammals.
B. The returning echoes help bats determine where insects are flying.
What central idea is suggested in this paragraph?
Dolphins make clicking sounds underwater. The sounds bounce off fish, rocks, and other objects before returning to the dolphin. The information from these echoes helps dolphins travel through cloudy water and find food.
A. Fish and rocks can be found underwater.
B. Dolphins make clicking sounds.
C. Dolphins use echoes to travel through cloudy water and find food.
D. Dolphins prefer to hunt in cloudy water.
C. Dolphins use echoes to travel through cloudy water and find food.
What central idea is suggested in this paragraph?
Ocean water is not always clear. Dolphins can still detect prey and identify obstacles because the echoes from their clicks provide information about the objects around them.
A. Ocean water is sometimes cloudy.
B. Dolphins use clicks underwater.
C. Obstacles can be found underwater.
D. Dolphins can depend on echolocation when visibility is limited.
D. Dolphins can depend on echolocation when visibility is limited.
Which TWO details best support the central idea that echolocation helps dolphins survive in the ocean?
Echolocation helps dolphins find prey, avoid obstacles, and learn about nearby objects. This ability allows dolphins to move safely through their environment.
A. Dolphins live in the ocean.
B. Dolphins learn about nearby objects. C. Echolocation helps dolphins find prey.
D. Echolocation helps dolphins avoid obstacles.
C. Echolocation helps dolphins find prey.
D. Echolocation helps dolphins avoid obstacles.
Which detail best supports the central idea that dolphins use echolocation to gather information?
Dolphins make clicking sounds. The returning echoes provide information about nearby objects, including their location and size.
A. The returning echoes provide information about nearby objects.
B. Dolphins make clicking sounds.
C. Objects have different sizes.
D. Dolphins live in groups.
A. The returning echoes provide information about nearby objects.
What central idea is suggested in this paragraph?
Although bats and dolphins live in different environments, both animals use echolocation to locate food and avoid obstacles. The returning echoes help them move safely through their surroundings.
A. Bats and dolphins live in different environments.
B. Bats and dolphins use echolocation to locate food and avoid obstacles.
C. Dolphins are better at echolocation than bats.
D. Echolocation only works in darkness.
B. Bats and dolphins use echolocation to locate food and avoid obstacles.
What central idea is suggested in this paragraph?
Researchers placed obstacles in a bat's flight path during a nighttime study. The bats changed direction before reaching the obstacles, even though there was very little light. The bats responded to information from returning echoes.
A. Bats use information from echoes to travel safely around obstacles.
B. Obstacles can change a bat's flight path.
C. Researchers study bats at night.
D. Bats prefer to fly in very little light.
A. Bats use information from echoes to travel safely around obstacles.
Which TWO details best support the central idea that echolocation helps bats move safely through dark environments?
At night, bats send out high-pitched sounds that bounce off nearby objects. The returning echoes tell bats where trees, branches, and other obstacles are located. This helps bats avoid collisions while flying.
A. Bats send out high-pitched sounds.
B. The returning echoes tell bats where obstacles are located.
C. This helps bats avoid collisions while flying.
D. Bats fly at night.
B. The returning echoes tell bats where obstacles are located.
C. This helps bats avoid collisions while flying.
Which detail best supports the central idea that echolocation helps bats travel safely?
Even in complete darkness, bats can identify trees and branches before reaching them. This allows bats to change direction and avoid collisions.
A. Bats fly in darkness.
B. Bats can change direction.
C. Trees and branches are obstacles.
D. Bats can identify trees and branches before reaching them.
D. Bats can identify trees and branches before reaching them.
What central idea is suggested in this paragraph?
Scientists have observed bats flying through forests without hitting branches. Even in complete darkness, bats can identify the location of nearby objects by listening to returning echoes.
A. Bats live in forests.
B. Branches are obstacles for bats.
C. Echolocation helps bats navigate safely in darkness.
D. Scientists study bat behavior.
C. Echolocation helps bats navigate safely in darkness.
What central idea is suggested in this paragraph?
During a search for food, a dolphin produced rapid clicking sounds. As the clicks bounced off nearby fish, the dolphin quickly changed direction and moved toward its prey. The dolphin successfully located food without relying on sight.
A. Dolphins change direction while swimming.
B. Dolphins can use echolocation to locate prey.
C. Dolphins depend on nearby fish to create sound waves.
D. Dolphins swim faster when hunting.
B. Dolphins can use echolocation to locate prey.
Which TWO details best support the central idea that dolphins use echolocation to gather information about their surroundings?
When dolphins make clicking sounds, the echoes that return provide information about nearby objects. Dolphins can learn an object's location, size, and shape even when visibility underwater is poor.
A. Dolphins make clicking sounds.
B. Dolphins can learn an object's location, size, and shape.
C. Visibility underwater is sometimes poor.
D. The echoes provide information about nearby objects
B. Dolphins can learn an object's location, size, and shape.
D. The echoes provide information about nearby objects.
What central idea is suggested in this paragraph?
Researchers found that both bats and dolphins can continue finding food even when conditions make it difficult to see. Bats rely on echoes while flying through darkness, and dolphins rely on echoes while swimming through cloudy water.
A. Darkness and cloudy water make finding food impossible.
B. Bats and dolphins search for food in different places.
C. Echolocation helps bats and dolphins find food when visibility is poor.
D. Bats use echolocation more effectively than dolphins.
C. Echolocation helps bats and dolphins find food when visibility is poor.
What central idea is suggested in this paragraph?
When a dolphin's clicks strike an object, echoes return with information about that object's location, size, and shape. Dolphins use this information to understand their surroundings.
A. Dolphins communicate through clicks.
B. Objects underwater vary in size and shape.
C. Echoes provide dolphins with information about their surroundings.
D. Dolphins swim near many different objects.
C. Echoes provide dolphins with information about their surroundings.
What central idea is suggested in this paragraph?
Bats and dolphins live in very different habitats, yet both depend on echoes to gather information about the world around them. This allows each animal to find what it needs and avoid dangers in its environment.
A. Bats and dolphins live in different habitats.
B. Echoes travel through air and water.
C. Animals depend on their environments.
D. Echolocation helps both bats and dolphins survive in their environments.
D. Echolocation helps both bats and dolphins survive in their environments.
Which TWO details best support the central idea that bats and dolphins use echolocation in similar ways?
Although bats live in the air and dolphins live in the water, both animals rely on returning echoes. These echoes help them locate food and avoid obstacles in their environments.
A. Dolphins live in the water.
B. Both animals rely on returning echoes.
C. Bats live in the air.
D. The echoes help them locate food and avoid obstacles.
B. Both animals rely on returning echoes.
D. The echoes help them locate food and avoid obstacles.
Which TWO details best support the central idea that echolocation helps bats gather information about their surroundings?
Bats send out high-pitched sounds that bounce off objects around them. The returning echoes help bats determine the location of insects, trees, and other objects while flying.
A. Bats send out high-pitched sounds.
B. The returning echoes help bats determine the location of insects.
C. Bats fly while using echolocation.
D. The returning echoes help bats determine the location of trees and other objects.
B. The returning echoes help bats determine the location of insects.
D. The returning echoes help bats determine the location of trees and other objects.