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Positive and Negative Geotropism

tipo de documento Biologie - Expérimentation/Travaux pratiques

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We all know that plants can’t walk from place to place, but they do move their stems, leaves, and roots in response to their environment. It just happens too slowly for us to see. These plant movements are called tropisms. In a positive tropism, the plant moves towards the stimulus. One familiar example is positive phototropism, in which a plant moves towards sunlight. Time lapse photography allows us to appreciate the tropisms of plants. This video shows the positive phototropism of sprouting snow peas. Note how the pea sprouts move back and forth with each day.Plants can also move away from stimulus; this is called a negative tropism. Some plants move away from bright light, this tropism is called negative phototropism

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