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How does chemical coordination occur in plants?



  • Plants do not have nervous systems or muscles for movement.
  • But they have hormones for chemical coordination.
  • Hormones are chemical messengers that respond to internal and external stimuli.
  • They are produced in small quantities in a part of the plant and then transported through xylem, phloem or by diffusion to other parts.
  • They may promote or inhibit growth


For example let us consider sunflowers growing towards the sunlight.

  • Once the plant detects sunlight , the hormone auxin is secreted at the shoot tips .
  • The secreted auxins diffuse towards the shady side of the plant
  • This makes the cells on the shady side grow longer
  • Thus, the plant appears to bend towards light


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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo