Question

what is difference between syngamy and triple fusion?

Answer 1

Syngamy :
In angiosperms one male gamete fuse with egg cell and forms zygote. This phenomenon is known as syngamy.
Triple fusion :
The fusion of male gamete with diploid secondary nucleus to produce triploid primary endosperms nucleus (PEN) is known as triple fusion.

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Answer 2

in angiosperms one male gamete fyse with a egg cell and form zygote is known as syngamy. 
where as
the fusion of male gamete  with diploid secondary nucleus to produce triploid primary endosperms nucleus (pen) known as triple fusion