Plant Responses

Tropism

Directional growth or movement of a plant in response to an external stimulus

Phototropism

Growth/movement of a plant toward (positive) or away from (negative) a directional light source, typically blue light

Gravitropism

Innate ability of plants to grow in response to gravity, directing roots downward (positive) and shoots upward (negative)

Thigmotropism

Biological phenomenon where plants grow or move in response to physical contact or touch (positive is to, negative is away)

Heliotropism

Movement of plant parts to follow the sun's path maximizing light absorption for energy, warmth, and enhanced growth

Nastic Movements

Non-directional plant responses to stimuli that are usually rapid, reversible, and independent of the stimulus position (Kiley plant)

Seismonastic Movements

From touch/temperature/shaking

Sleep Movements

Daily movements, depend on light changes