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  • (a) State one difference and one similarity between geitonogamy and xenogamy.    (b) Explain any three devices developed in flowering plants to discourage self pollination and encourage cross pollination.   

(a) State one difference and one similarity between geitonogamy and xenogamy.  

 (b) Explain any three devices developed in flowering plants to discourage self pollination and encourage cross pollination. 

 

 

 

 
 
 
 
 

Answers (1)

(a) Difference : In geitonogamy pollen grains from one flower are transferred to stigma of another flower on the same plant whereas in Xenogamy the pollen grains are transferred to the stigma on another plant.

Similarity: In both types, pollen grains from anther is transferred too stigma of another flower.

(b)

  • Pollen release and stigma reciptinity not synchronised / hence the maturity of stigma and pollen are differnet.
  • Anther and stigma are placed at different positions so that pollen cannot come in contact with stigma of same flower.
  • Self incompatibility / Self sterility
  • Production of unisexual flowers.
Posted by

Priyanka Kumari

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