Plant Responses to External and Internal Stimuli

Steven sets a brand new plant near the window. After several weeks Steven realizes the flower is starting to tilt towards the sunlight. What would be considered the stimuli in this scenario?

• Water

• The dirt in the flower pot

• The sunlight

• The window

Tags

NGSS.MS-LS1-8

Stimulus is like the "cause" and response is like...

• the cause

• the effect

• the reaction rate

• the response time

What are the two types of stimuli?

• External and internal stimuli

• External and intermediate stimuli

• Internal and extraterrestrial stimuli

Tags

NGSS.MS-LS1-8

A stimulus is _________

• process in which organisms grow larger.

• a change in the environment that causes a reaction

• a reaction to a change in surroundings

• the center of a cell

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Define response.

• Change in an organism’s environment that causes it to react.

• How the organism reacts to the stimulus.

Which type of plant tropism response is shown in the video?

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism

Which type of plant tropism response is shown in the video?

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism

Which type of plant tropism response is shown in the video? Hint: The roots are growing towards the water source.

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism

Which type of plant tropism response is shown in the video? Hint: Even though the plant is laying on its side, it starts growing up (away from the Earth's gravitational force).

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism

Any change in an organism’s environment that causes the organism to react. Example: The Sun would be this for a plant demonstrating phototropism.

• Stimulus

• Response

• Effect

• Force