Q11 of 53 Page 12

What is self-incompatibility?

Self-incompatibility is a genetic mechanism that prevents self-pollination (i.e., pollination from same flower or other flowers of same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.


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9

Can an unfertilised, apomictic embryo sac give rise to a diploid embryo? If yes, then how?

 10

Which are the three cells found in a pollen grain when it is shed at the three celled stage?

 12

Name the type of pollination in self-incompatible plants.

 13

Draw the diagram of a mature embryo sac and show its 8-nucleate, 7-celled nature. Show the following parts: antipodals, synergids, egg, central cell, polar nuclei.