Stimuli and Response in Plants (1)

Examples of stimuli detected by plants

Light, water, gravity and touch

Two types of plants responses

Tropism and Nastic movement

Definition of tropism

Tropism is a directional response towards the stimulus in plants

Definition of positive tropism

Part of plants that grow to the direction of the stimulus

Defintion of negative tropism

Parts of plants that grow to the opposite direction of the stimulus

Definition of phototropism

Plants response towards light

Defintion of hydrotropism

Plants response towards water

Defintion of geotropism

Plants response towards gravity

Definition of tigmotropism

Plants response towards touch which forming tendrils and twinning stem

Defintion of nastic movement

Nastic movement is a non-directional response to stimulus in plants as an example response to touch