3rd Grade Science : Explain how trait variations give survival advantages

Study concepts, example questions & explanations for 3rd Grade Science

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Example Questions

Example Question #1 : Characteristics Among Species

Which plant does NOT have a trait variation that would give it a survival advantage?

Possible Answers:

Cactus, Green, Flower, Prickly, Color

Spur, Plant, Prickly, Nature, Thorns

Rose, Flowers, Nature, Love, Romantic

Flower, Bloom, White, Summer, Daisy

Correct answer:

Flower, Bloom, White, Summer, Daisy

Explanation:

The daisy does not have a trait variation that gives it a survival advantage. All of the other plants have a defense mechanism, thorns. The cactus, the rose, and the spurred bush all have spikey thorns on the stems to protect the plant from being eaten. This is a trait variation that gives it an advantage over other plants in the area that do not have a way to protect themselves.

Example Question #1 : Explain How Trait Variations Give Survival Advantages

Are all animals in a group the same? Why or why not?

Possible Answers:

No; All animals in a group are not the same because some like different things.

No; All animals in a group are not the same because some develop trait variations.

Yes; All animals are the same in a group because they have the same parents.

Yes; All animals are the same in a group because they are the same species.

Correct answer:

No; All animals in a group are not the same because some develop trait variations.

Explanation:

All animals in a group are not the same. Animals inherit traits from their parents as well as learn them based on observation and teaching. Over time animals' characteristics will vary depending on their conditions and survival needs. An animal may develop camouflage or other defense tactics to protect itself and keep it from being eaten. As demands for survival change, so do animal traits.

Example Question #3 : Explain How Trait Variations Give Survival Advantages

Which animal is demonstrating a trait that leads to a survival advantage?

Possible Answers:

Snake, Python, Boa Constrictor, Reptile

Owl, Camouflage, Wildlife, Bird Of Prey

Nature, Bird, Animal, Swan, Spring, Owl

Peacock, Peafowl, Pattern, Plumage

Correct answer:

Owl, Camouflage, Wildlife, Bird Of Prey

Explanation:

The animal that is demonstrating a trait that gives it a survival advantage is an owl. It is so well camouflaged with the tree that a predator is less likely to see it. Over time animals and plants will have variations in their traits that help them to survive in their specific conditions. The animals or plants that can adapt will outlive those who cannot.

Example Question #1 : Explain How Trait Variations Give Survival Advantages

Which answer choice best explains what the term variation means? Example: The moth's variation in color pattern helps it blend in with the bark.

Possible Answers:

The term variation means something that stays the same or constant.

The term variation means something numerous or plentiful.

The term variation means a change or difference in something.

The term variation means beautiful and fancy.

Correct answer:

The term variation means a change or difference in something.

Explanation:

The term variation refers to something that changes or is different. When there is a variation in color or pattern, like in the example, that means there is a change in the shade or design. Animals and plants may also have a variation in traits, which means that over time their characteristics may change or adapt to the environment they are living in to help them survive.

Example Question #5 : Explain How Trait Variations Give Survival Advantages

Explain how the cheetahs' variation in traits has given it a survival advantage above other animals.

Cheetah, Animal, Wildlife, Leopard

Possible Answers:

The cheetah has very sharp claws that help it dig tunnels for hiding.

The cheetah is very attractive so other animals like it.

The cheetah hunts animals that no other predators want to eat.

The cheetah can run very fast to catch its prey.

Correct answer:

The cheetah can run very fast to catch its prey.

Explanation:

The cheetah is just one of many predators in Africa, hunting for food daily. The cheetah has a variation in its traits that makes it unique and well suited for the environment it lives in and the prey it hunts. The cheetah has developed over many years the ability to run incredibly fast. When hunting gazelles and other fast land animals, the cheetah has to be able to outrun and catch the prey. These high speeds have helped the cheetah survive while other predators have not done so well.

Example Question #6 : Explain How Trait Variations Give Survival Advantages

Plants and animals have variations in their physical and behavioral traits. How do these variations provide advantages to their survival?

 

Possible Answers:

Variations in traits allow plants and animals to adapt to changes in the environment to increase their survival chances.

Variations in traits allow plants and animals to adapt to changes to the environment.

Variations in traits do not provide any advantage for the plant or animal.

Variations in traits allow plants and animals to adapt to changes in the environment to decrease their survival chances.

 

Correct answer:

Variations in traits allow plants and animals to adapt to changes in the environment to increase their survival chances.

Explanation:

Traits can be learned or inherited and aid animals and plants in survival. Variations are changes or differences. A variation in a trait is a change or difference in the trait. As plants or animals need to adapt to changes in their environment, their characteristics may need to adjust as well. An example would be if insects or animals are eating a plant over many years, it may develop thorns or spikes to keep it from being eaten. This change in structure and traits give the plant a survival advantage.

 

Example Question #7 : Explain How Trait Variations Give Survival Advantages

The saguaro cactus has adapted in many ways to the harsh environment it lives in. The roots of a juvenile cactus reach as far as two meters and grow even more extensive as the cactus ages. Widespread roots systems allow the caucus to gather as much moisture as possible from the desert soil. This trait variation enables the cactus to collect water when rainfall is so rare. The saguaro has a large barrel-shaped stem that allows it to store water. It has no leaves, so it does not lose water to transpiration. One trait that varies from other plants is the long thorns on the stem of the cactus. These thorns keep animals away, so they don't drink the water inside.

Which variation(s) of traits give the saguaro cactus a survival advantage?

Possible Answers:

Thorns

Barrel-shaped stem

All of the answer choices are correct

Widespread roots

Correct answer:

All of the answer choices are correct

Explanation:

The saguaro cactus has several traits that give the plant a survival advantage in the desert. Widespread roots, thorns, and a barrel-shaped stem all help the cactus stay alive in the harsh environment. Deserts have very little water, and the saguaro cactus has adapted to survive these conditions.

Example Question #8 : Explain How Trait Variations Give Survival Advantages

The saguaro cactus has adapted in many ways to the harsh environment it lives in. The roots of a juvenile cactus reach as far as two meters and grow even more extensive as the cactus ages. Widespread roots systems allow the caucus to gather as much moisture as possible from the desert soil. This trait variation enables the cactus to collect water when rainfall is so rare. The saguaro has a large barrel-shaped stem that allows it to store water. It has no leaves, so it does not lose water to transpiration. One trait that varies from other plants is the long thorns on the stem of the cactus. These thorns keep animals away, so they don't drink the water inside.

How do these trait variations give the cactus an advantage in the desert?

Possible Answers:

Their adaptations help them increase water intake when it is available.

All answer choices are correct.

Their adaptations help them store water when it is available.

Their adaptations help them decrease water loss when it is available.

Correct answer:

All answer choices are correct.

Explanation:

The saguaro cactus can decrease its water loss, increase water intake, and can store water when needed. The barrel-shaped stem stores water that the widespread roots collect. The cactus has long thorns to keep animals away and prevent them from drinking the cactus' water. These trait variations or adaptations help the plant to survive in the desert.

Example Question #9 : Explain How Trait Variations Give Survival Advantages

Skunks have black, brown, or grey fur with a bright white stripe down the center of their backs. This stripe serves as a warning to anything that might try to attack it. When frightened or threatened, a skunk will spray a stinky, musky liquid at its predator. The skunk will give a warning that it's about to spray by arching its back, raising its tail high in the air, turning its back toward the enemy, and stomping its front feet. The smell stays on the predator and can even get into their eyes. The spray can reach a predator up to 15 feet away!

How does this trait variation give the skunk a better chance at survival?

Possible Answers:

The odorous spray helps the skunk hide in the forest.

The size of the skunk helps it run faster than predators.

The weight of the skunk makes it too heavy to be carried away.

The colors and odorous spray help keep the skunk from being eaten.

Correct answer:

The colors and odorous spray help keep the skunk from being eaten.

Explanation:

The first trait variation that gives skunks a survival advantage is their dark fur with the bright, white stripe. This stripe serves as a first phase warning for predators who may be tempted to eat it. The second trait variation involves the odorous spray. If the predator is still not deterred, the skunk will raise its tail and threaten to spray the other animal. If the skunk needs to defend itself further, it will cover the predator in a stream of stinky spray. These defense mechanisms are traits the skunk can use to help it survive.

Example Question #10 : Explain How Trait Variations Give Survival Advantages

Skunks have black, brown, or grey fur with a bright white stripe down the center of their backs. This stripe serves as a warning to anything that might try to attack it. When frightened or threatened, a skunk will spray a stinky, musky liquid at its predator. The skunk will give a warning that it's about to spray by arching its back, raising its tail high in the air, turning its back toward the enemy, and stomping its front feet. The smell stays on the predator and can even get into their eyes. The spray can reach a predator up to 15 feet away!

Skunks have unique trait variations that will allow it to survive in ways other animals cannot. A skunks fur pattern, fur color, and spray will enable it to catch more prey than other animals.

Possible Answers:

False

True

Correct answer:

False

Explanation:

A skunks fur pattern, fur color, and spray will NOT enable it to catch more prey than other animals. These specific variations allow the skunk to defend itself against predators. These are survival traits that the skunk has adapted over many years.

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