Science Form 3_Chap 1.3 Stimuli and Responses in Plants

What is stimuli?

• changes in an organism’s environment that cause a response.

• plant’s response to the number of hours of darkness in its environment.

• substances that act as chemical messengers within plants.

• growth toward a stimulus.

what type of tropism is occurring here?

• Phototropism

• Thigmotropism

• Geotropism

• Hydrotropism

What is an example of a stimulus for plants?

• Touch

• Light

• Gravity

• Water

• all of the above

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

NGSS.MS-LS2-1

Mimosa sp. responds to touch by folding its leaves inwards when touched. The responds occurs rapidly.

• Thigmotropism

• Phototropism

• Geotropism

• Nastic movement

When the plant grows toward the light.

• Negative hydrotropism

• Positive geotropism

• Negative phototropism

• Positive phototropism

When the plant grows toward the stimuli

• Positive
• Negative

When the plant grows away from the stimuli

• Positive 
• Negative

Tags

NGSS.MS-LS1-5

What type of tropism response to water?

• Hydrotropism

• Geotropism

• Thigmotropism

• Phototropism

A vine plant brushes against a fence and wraps itself around the fence. To what stimulus is the plant responding?

• phototropism

• hydrotropism

• thigmotropism

• geotropism

Plant’s roots grow down, anchoring it into the soil. To what stimulus is the plant responding?

• thigmotropism

• hydrotropism

• phototropism

• geotropism