Science LEAP practice Session 3

Humans have 6 million smell receptors. Rabbits have 100 million smell receptors. Most dogs have 1 billion smell receptors. Using this information, which statement best explains why a dog's brain can process more information about smell than a rabbit's brain can?

• Dogs take in different kinds of information with their smell receptors than rabbits do.

• Dogs process information from their noses and tongues to learn about their surroundings.

• Dogs have a smaller range of vision than rabbits do and learn to rely on their memories about smells.

• Dogs take in more information because they have at least 10 times as many smell receptors as rabbits have.

Which statement best describes how a rabbit processes information that is taken in by the rabbit's eyes?

• A rabbit's eyes send images to its brain so that the rabbit can see a place to hide.

• A rabbit's eyes send signals to its muscles so that the rabbit can run from danger.

• A rabbit's eyes send signals to its brain so that the rabbit can decide how to respond.

• A rabbit's eyes send images to its ears and nose so that the rabbit can take in more information.

Tags

NGSS.MS-LS1-8

Which statement best describes how a rabbit knows whether it is in danger?

• The rabbit's eyes recognize the shape of a predator.

• The rabbit's brain compares memories to information from the environment.

• The rabbit's ears and nose remember what a predator sounds and smells like.

• The rabbit's brain combines visual, scent, and sound information into a complete image.

Tags

NGSS.MS-LS1-8

Some dog breeds hunt rabbits by sight. The rabbits see the dogs before the dogs get close to them. When the rabbits realize there is danger, they start running. The dogs chase after the moving rabbits. Which explains why dogs are able to hunt by sight and how rabbits can see the dogs before they get close?

• Dogs have eyes that are facing forward which allow them to easily see and track rabbits.

• Rabbits have eyes on the sides of their heads that give them a wider range of vision.

• Dogs have eyes that face forward that allow them to easily see and follow rabbits. Rabbits have eyes on the sides of their heads that allow them to see the dogs before they get close to them.

• Dogs use their great sense of smell to track the rabbits.

Tags

NGSS.3-LS4-2

NGSS.4-LS1-2

Ana strikes the flint hard with the steel rod and then strikes the same flint more gently. Jon notices that one strike is louder than the other. Which statement best explains why Jon hears a difference between the volume of the hard strike and the volume of the soft strike?

• More energy is transferred from the objects to the air when two objects collide at a higher speed.

• The flint transfers all the energy to the air in the hard strike.

• The flint absorbs all the energy in the soft strike, so no energy is transferred to the air.

• More energy is produced when a spark is created, causing more energy to be transferred to the air.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS4-1

Ana strikes the flint hard with the steel rod. Which claim is best supported by the observation that a spark is produced when the flint is struck hard?

• Energy is transferred to the flint.

• Heat is transferred to the flint.

• Matter is transferred to the flint.

• Energy is transferred to Ana.

Tags

NGSS.MS-PS3-5

A spark is produced when the flint is struck hard by Ana with the steel rod. Which evidence best supports that energy has been transferred to the flint?

• The flint gains mass.

• Ana's hand develops a bruise.

• Heat and light are created.

• The flint is colder after it is struck.

Tags

NGSS.MS-PS3-5

Jon measured the air temperature around a rock before and after he struck it many times with the steel rod. The temperature before striking was 18 degrees Celsius, and the temperature after striking was 19 degrees Celsius. Which best explains why the temperature of the air increased?

• Light energy from the Sun reflected off the steel rod.

• Heat energy transferred to the surrounding air when the objects collided.

• Motion energy stored in the rock was released into the air when the rock was hit.

• Heat energy stored in the steel rod was released into the air after the rod hit the rock.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Jon and Ana investigate whether materials other than a steel rod and flint can be used to start a fire. They push a stick of wood against a groove in a board made of a softer wood. Which question could Jon and Ana investigate to determine whether this method can start a fire?

• Does the stick absorb energy from the air to create a spark?

• Does the stick create heat energy when it is pushed against the board?

• Does the stick react with the oxygen in the air to create a spark?

• Does the stick create heat and light energy when it first touches the board?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-5

Which two pieces of evidence would support the claim that fire could be made by two materials that were being rubbed together?

• the presence of sparks between the materials being rubbed together

• a scent in the air that smells like wood

• deep scratches being made on one of the materials

• a temperature change in the air close to the materials

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4