The given figure of an egg apparatus of an angiosperm shows the entry of pollen tube for releasing the two male gametes. Which of the two from 
and 
, the two male gametes fuse with?
and 
and 
Text Solution
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In the given figure of an egg apparatus of an angiosperm, X-Egg nucleus, Y-Polar nuclei, Z-Synergid.
When the two male gametes are released from pollen tube into the cytoplasm of the synergid, one fuses with egg nuclei (X) to form zygote and other fuses with polar nuclei (Y) to produce a triploid primary endosperm nucleus.
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