Why do leaves drop off seasonally? Give reason. Give an example to show positive and negative geotropism.
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Answer:
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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Answer:
leaves drop off seasonally,mainly in summer season to avoid transpiration because they need water nd during transpiration there is a loss of water from the surface of leave by tiny pores present on it so plants mainly shade off there leave during summer season .
positive geotropism:growth of roots inside the earth
negative geotropism:growth of shoots toward upward direction.
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