Class 11 Biology Plant Growth Development Vernalisation


  • There are plants for which flowering is either quantitatively or qualitatively dependent on exposure to low temperature, this phenomenon is termed vernalisation.
  • Vernalisation refers specially to the promotion of flowering by a period of low temperature.
  • Some important food plants, wheat, barley, rye have two kinds of varieties: winter and spring varieties.
  • The ‘spring’ variety is normally planted in the spring and come to flower and produce grain before the end of the growing season.
  • Winter varieties, if planted in spring, would normally fail to flower or produce mature grain within a span of a flowering season.
  • Another example of vernalisation is seen in biennial plants, which are monocarpic plants that normally flower and die in the second season.

For example- sugerbeet, cabbages, carrots.


Fig. Vernalisation

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