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Question

 The following picture shows positive .
 
  1. geotropism
  2. hydrotropism
  3. phototropism
  4. thigmotropism


Solution

The correct option is B hydrotropism
Growth towards water is called hydrotropism. Roots show positve hydrotropism. Phototropism is in reponse to light; thigmotropism is in response to touch; geotropism is in response to gravity. The picture indicates growth of roots towards water showing positive hydrotropism.

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