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Q.
Pollen embryo sacs are
Chhattisgarh PMTChhattisgarh PMT 2009
Solution:
Normally the number of nuclei in a mature pollen grain is two or three. But sometimes an increase in the number of nuclei in the male gametophyte may occur, which leads to the formation of female gametophyte embryo sac like structures called pollen embryo sacs.