4th Grade Science : Life Science
Study concepts, example questions & explanations for 4th Grade Science
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Example Questions
Example Question #7 : Argue That Animals Have Structures For Survival
Animals rely solely on external structures to help them survive.
False
True
False
Animals have many internal structures which they rely on for survival. For example, the lungs, brain, and heart are all internal structures necessary for survival. Some animals have less common internal structures, too, like antifreeze proteins in the blood of Antarctic fish.
Example Question #2 : Argue That Animals Have Structures For Survival
Which of the following is NOT a structure that helps an animal survive?
Lungs
Fur Patterns
All of these are structures that help animals survive.
Antlers
All of these are structures that help animals survive.
Antlers are an example of an external structure that animals may use for protection or fighting. Fur patterns can help animals camouflage themselves as protection. Lungs help an animal breathe in its environment.
Example Question #2 : Argue That Animals Have Structures For Survival
Darrell says that elephants’ size is the only thing that helps them survive in their habitats. Why is Darrell’s argument wrong?
Elephants have tusks that they can use to protect themselves.
Elephants have long trunks that can pick up food and suck up water.
All of these arguments are reasons why Darrell’s argument is wrong.
Elephants have large ears and wrinkly skin, which helps them stay cool.
All of these arguments are reasons why Darrell’s argument is wrong.
While animals’ size can undoubtedly assist them in their efforts to survive, elephants have several other structures that they rely on for survival, including their ears and skin, which keep them cool, their trunks which they use to eat and drink, and their tusks that they use for protection.
Example Question #1 : Argue That Animals Have Structures For Survival
Platypus have a "sixth-sense" that allows them to hunt underwater: electroreception. To find meals in the mud, it uses its bill to detect movements and subtle electric fields produced by its prey. Receptors on the bill detect changes in pressure and motion. Two types of receptors track the electrical signals produced by small prey when they contract their muscles. The platypus moves its head side-to-side to determine the direction and distance of its next meal by collecting and processing this sensory information. The platypus has about 40,000 of these special receptors.
Electroreception is an example of an ______________ structure.
External
Internal
Internal
Electroreception is an internal structure. Internal structures are the inner pieces and parts which keep animals alive. A platypus cannot survive without electroreception, or, the ability to perceive electrical stimuli.
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