Question 4 Page 122 - Chapter 7 Class 10 - Control and Coordination

Last updated at April 16, 2024 by

How do auxins promote the growth of a tendril around a support?

 

Answer

MOVEMENT DUE TO GROWTH IN PLANTS - Teachoo.jpg

Auxins promote growth of a tendril by

  • The stem and leaf tendrils are sensitive to touch.
  • When they come in contact with the support , auxins are synthesized and it diffuses to the other side of the plants.
  • This makes the rate of growth of tendrils less as against the other parts of the plants.
  • The tendrils cling on to a support (eg. bamboo stick) and grows on by circling around the stem for support.
  • This is a growth that is directional (up the support) and so it appears as movement.
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Transcript

MOVEMENT DUE TO GROWTH IN PLANTS Stem tendril Leaf tendril Weak stem Bamboo stick (for support) Bamboo stick (for support)

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo