Show with the help of an activity that ‘the stem of a plant always grows upwards and away from gravity’.
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The directed growth responses that make the plant grow in direction of or away from a stimulus are known as tropic movements. Directed growth of plant caused by light is known as phototropism. Positive phototropism is a movement towards the light source while negatively refers to away from it. Gravitropism/geotropism is growth response of plant in direction of gravity. Positive geotropism is the movement towards the center of the earth while negatively refers to away from it. Growth responses towards or away from moisture are known as positive or negative hydrotropism respectively.
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