Scientists measured the spot size of guppies (small fish) in two different populations. Which population has more guppies with large spots?

The population in Venezuela has more guppies with large spots.

They both have the same number of guppies with large spots.

The population in Brazil has more guppies with large spots.

These bar graphs do not show which population has more guppies with large spots.

Hummingbirds with longer beaks can get food from long flowers. Hummingbirds with shorter beaks cannot reach the nectar in long flowers. If a hummingbird can’t easily reach its food, it will die.The diagrams below show three possible hummingbird populations.

Populations 2 and 3 will survive.

Only population 2 will survive because it is the only population with variation.

All the populations will survive because the hummingbirds will change the length of their beaks if they need to.

Populations 1 and 2 will survive.

Ducks with thicker feathers are more likely to stay warm and survive in cold water. But, in warm water, thicker feathers can make the ducks overheat and die.The diagram below shows a population of ducks that live in an area of an ocean. Based on the change to the population, how did the environment change?

The water became warm and with each generation, more ducks with thin feathers survived long enough to pass on the gene for thin feathers to their offspring.

The water became warm and the ducks with thick feathers changed to have thin feathers.

The water became warm and since ducks with thin feathers were more likely to survive, both kinds of ducks passed on the gene for thin feathers to their offspring.

There is a kind of snake that can be born with red or yellow skin. Eagles hunt these snakes, but snakes that are the same color as their environment are harder for the eagles to see and catch. The diagram below shows a population of snakes that live in an environment where there was yellow sand and red dirt. At time 1, the population had the same number of yellow and red snakes. At time 2, after many generations, there were many more red snakes and fewer yellow snakes in the population. How did the environment change between time 1 and time 2? How did the population change?

There was more red dirt in the environment so with each generation, more red snakes survived long enough to pass on the gene for red skin to their offspring.

You cannot tell how the environment changed. With each generation, more snakes passed on the gene for red skin to their offspring.

There was more red dirt in the environment and since red snakes are more likely to survive, the yellow snakes changed to have red skin.

There was more red dirt in the environment and since red snakes are more likely to survive, so both kinds of snakes passed on the gene for red skin to their offspring.

Scientists measured the height of the giraffes in two different populations. Which population has the largest number of tall giraffes?

The population in Somalia has the largest number of tall giraffes.

The population in Niger has the largest number of tall giraffes.

Both populations have the same number of tall giraffes.

These bar graphs do not show which population has more tall giraffes.

Seals with thicker blubber (fat) are more likely to stay warm and survive in cold ocean waters. But, in warm ocean waters, thicker blubber can make the seals overheat and die. The diagrams below show three possible seal populations. If their environment changes to have warm water, which of the following seal populations will most likely survive?

Populations 1 and 2 will most likely survive.

Populations 2 and 3 will most likely survive.

Only Population 2 will survive because it is the only population with variation.

All the populations will survive because the seals will change the thickness of their blubber if they need to.

Blue jays with thinner beaks can easily reach and eat the seeds inside pinecones. Blue jays with thicker beaks can easily open and eat seeds with hard shells.The diagram below shows a population of blue jays that live in a forest. How did the environment change between time 1 and time 2? How did the population change?

There were more trees that had pinecones with seeds so with each generation, more blue jays with thin beaks survived long enough to pass on the gene for thin beaks to their offspring.

There were more trees that had pinecones with seeds and since blue jays with thin beaks are more likely to survive, the blue jays with thick beaks changed to have thin beaks.

There were more trees that had pinecones with seeds and since blue jays with thin beaks are more likely to survive, both kinds of blue jays passed on the gene for thin beaks to their offspring.

You cannot tell how the environment changed but with each generation, more blue jays passed on the gene for thin beaks to their offspring.

Lizards with shorter legs are better at climbing trees than lizards with longer legs. This makes lizards with shorter legs better at escaping from the floods that sometimes cover the islands. The diagram below shows a population of lizards that live on an island. How did the environment change between time 1 and time 2? How did the population change?

There were more floods. With each generation, more lizards with short legs survived long enough to pass on the gene for short legs to their offspring.

You cannot tell how the environment changed. With each generation, more lizards passed on the gene for short legs to their offspring.

There were more floods. Lizards with short legs are more likely to survive, so the lizards with long legs changed to have short legs.

There were more floods. Lizards with short legs are more likely to survive, so both kinds of lizards passed on the gene for short legs to their offspring.

Scientists measured the beak length of a population of birds in a lake in 1960. They measured the beak length of the bird population again in 2010. When was there more variation in the beak lengths of the birds by the lake?

There was more variation in 1960.

There was the same amount of variation in 1960 and in 2010.

These bar graphs do not show the amount of variation in the population.

There was more variation in 2010.

What was the likely cause for the change in the rough-skinned newt population?

Snakes became part of the environment

The newts started eating poisonous plants

It is impossible to tell what happened to the rough-skinned newts.

What can be predicted to change in the newt population if the snakes in the environment begin to develop more of a resistance to the rough-skinned newt poison?

Newts with lower poison levels will continue to decrease leaving fewer variations

It is impossible to tell what happened to the rough-skinned newts.

Newts will mutate a new form of defense

Newts will start producing a different poison

How do new traits enter the population?

Random mutations occur when the genes are passed down from parent to offspring.

Parents choose to have offspring with a different trait.

Mutations will cause helpful traits to appear in the population.

Which of the following is an example of a behavioral adaptation?

Both migrating in winter and being nocturnal

In a population of beetles, the ones with green shells are eaten more frequently by birds than the ones with brown shells. Over time, what is likely to happen to the population?

The number of brown-shelled beetles will increase.

The number of green-shelled beetles will increase.

The shell color of the beetles will not change.

The beetles will develop a new defense mechanism.

Natural Selection Unit Test

Authored by Shelby Sonke

Science

6th - 8th Grade

NGSS covered

Used 21+ times

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36 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An instruction for making a protein molecule

Gene

Adaptive Trait

Extinct

Mutation

Natural Selection

Tags

NGSS.MS-LS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Having died out completely and no longer alive anywhere on Earth.

Extinct

Adaptive Trait

Gene

Mutation

Natural Selection

Tags

NGSS.MS-LS4-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A random change to a gene that sometimes results in a new trait

Mutation

Adaptive Trait

Extinct

Gene

Natural Selection

Tags

NGSS.MS-LS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Any difference in traits between individual organisms

Variation

Adaptive Trait

Extinct

Gene

Mutation

Tags

NGSS.MS-LS4-4

NGSS.MS-LS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A trait that makes it more likely that an individual will survive in a specific environment

Adaptive Trait

Extinct

Gene

Mutation

Natural Selection

Tags

NGSS.MS-LS4-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A type of large molecule that performs important functions inside organisms.

Protein Molecule

Adaptive Trait

Extinct

Gene

Mutation

Tags

NGSS.MS-LS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A group of the same type of organism living in the same area

Population

Adaptive Trait

Extinct

Gene

Mutation

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Natural Selection Unit Test

An instruction for making a protein molecule

Having died out completely and no longer alive anywhere on Earth.

A random change to a gene that sometimes results in a new trait

Any difference in traits between individual organisms

A trait that makes it more likely that an individual will survive in a specific environment

A type of large molecule that performs important functions inside organisms.

A group of the same type of organism living in the same area

A trait that makes it less likely that an individual will survive in a specific environment

The process by which the distribution of traits in a population changes over many generations

A specific characteristic of an individual organism

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