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Solution


Q.

What is the fate of the male gametes discharged in the synergid              [2019]
1 One fuses with the egg and other fuses with central cell nuclei.  
2 One fuses with the egg, other(s) degenerates in the synergid.  
3 All fuse with the egg.  
4 One fuses with the egg, other(s) fuse(s) with synergid nucleus.  

Ans.

(1)

During double fertilisation in angiosperms, one male gamete fuses with the egg to form the diploid zygote (syngamy or generative fertilisation). The diploid zygote finally develops into embryo. The other male gamete fuses with the two polar nuclei (or secondary nucleus) to form the triploid primary endosperm nucleus, PEN (triple fusion or vegetative fertilisation).