Internal and External Stimuli

A fox spots a rabbit in a field. The fox begins to chase the rabbit, and the rabbit runs away. Which best describes the rabbit's behavior in response to the stimulus of being chased?

• It is a tropism.

• It is a fight-or-flight response.

• It is a response caused by hunger.

• It is a response caused by an internal stimulus.

Tags

NGSS.MS-LS1-8

Which word best describes the response the seedlings are showing?

• homeostasis

• stimulus

• hibernation

• phototropism

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-8

What is homeostasis?

• changes in a species over time

• the response of an organism to a stimulus

• the ability of an organism to reproduce

• the balance in an organism's internal environment

Tags

NGSS.HS-LS1-3

An example of an internal stimulus is 

• thirst

• temperature

• light.

• noise

Tags

NGSS.MS-LS1-8

Which of these is an example of a plant responding to an internal stimulus?

• a leaf wilting because of lack of water

• the stem of a sunflower bending toward light

• a leaf closing when a bee brushes against it

• the roots of a tree growing downward, in the direction of gravity

The diagram shows the cell of a plant. What can you infer about the plant this cell came from by observing the plant cell?

• The plant needs sunlight.

• The plant is healthy.

• The plant is wilting.

• The plant is photosynthesizing.

Tags

NGSS.MS-LS1-6

Dina is relaxing by walking her dog on a warm, sunny afternoon. Dina feels sweaty, and she sees that her dog is panting. Which is the most likely stimulus causing these responses in both Dina and her dog?

• hunger

• high temperature

• thirst

• light from the sun

Tags

NGSS.MS-LS1-8

What are two distinct ways an organism can respond to changes in the environment?

• physically and behaviorally

• through homeostasis and hibernation

• behaviorally and through migration

• physically and through homeostasis

Which of the following demonstrates forces that change the motion of an object?

• a boy stares out a window

• a girl dreams as she sleeps

• a rock rests on the ground

• a seedling emerges from the soil

Tags

NGSS.MS-PS2-2

Organisms can change in order to adapt to their conditions. What might a plant growing in a dark corner of an otherwise sunny room do to adapt to its conditions, and what is this response called?

• The plant will die; this is called death.

• The plant will stop all life processes; this is called dormancy.

• The plant will bend and grow toward the light; this is called phototropism.

• The plant will slow down all life processes; this is called hibernation.

Tags

NGSS.MS-LS1-5