A plant will recognize a pathogenic invader

Plants respond to environmental stimuli in a variety of ways, including: Tropisms: Turning toward or away from a stimulus, such as light, gravity, water, movement of the sun, and touch. For example, plant roots always grow downward because specialized cells in root caps detect and respond to gravity. Photomorphogenesis: Light-mediated changes in growth. Phytochrome is a plant pigment protein that mediates morphological changes in response to red and far-red light. Movement in response to stimuli: Plants can respond to touch, vibrations, rainfall, or wind. For example, the "touch-me-not"... Show more

Plants respond to environmental stimuli in a variety of ways, including:
Tropisms: Turning toward or away from a stimulus, such as light, gravity, water, movement of the sun, and touch. For example, plant roots always grow downward because specialized cells in root caps detect and respond to gravity.
Photomorphogenesis: Light-mediated changes in growth. Phytochrome is a plant pigment protein that mediates morphological changes in response to red and far-red light.
Movement in response to stimuli: Plants can respond to touch, vibrations, rainfall, or wind. For example, the "touch-me-not" (mimosa pudica) and the Venus fly trap (dionaea muscipula) respond to touch.
Plant hormones: Hormones control plant responses, such as how they grow

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