tropism

• Phénomène biologique désignant l'orientation ou le mouvement de croissance d'un organisme, généralement une plante, en réponse à un stimulus externe tel que la lumière ou la gravité.

A biological phenomenon referring to the involuntary orientation or growth movement of an organism, typically a plant, in response to an external stimulus such as light or gravity.

1. Involuntary orientation responseC1formalscientific

   An involuntary orienting response of an organism, involving positive or negative reaction to a stimulus source.

   Tropisme (réaction d'orientation involontaire)

   • The plant exhibited positive tropism by growing towards the sunlight.
   • Negative tropism causes roots to grow away from light.
   • Scientists studied the tropism of bacteria in response to chemical gradients.