7.13AB External and Internal 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.

Which word best describes the response the seedlings are showing?

• homeostasis

• stimulus

• hibernation

• phototropism

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.MS-LS1-3

An example of an internal stimulus is 

• thirst

• temperature

• light.

• noise

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-LS1-2

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 type of tropism is occurring here?

• phototropism

• thigmotropism

• gravitropism

• tropictropism

What type of tropism is response to touch? 

• Gravitropism
• Phototropism
• Thigmotropism
• Hydrotropism

Changes in an organism's environment that cause a response

• Tropism
• Hormone
• Stimuli
• Response

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4