Chapter 2: Control and Coordination

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Control and Coordination


How does phototropism occur in plants?


Phototropic movement or Phototropism – In this movement, the growth of plant parts occurs in response to light. The stem of plants usually moves towards light called positive phototropism. The root of plants grows in the opposite direction of light. So, it is called negative phototropism. It occurs due to the plant hormone called auxin. When the light falls on one part of the plant, the secretion of auxin hormone increases on the other part of the plant. Hence, the plant appears to bend towards the light due to the growth in the length of cells on the shady part.

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