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The ploidy of the primary endosperm nucleus (PEN) in angiosperms is:

AHaploid (n)
BTriploid (3n)
CDiploid (2n)
DTetraploid (4n)
Answer & Solution
Correct answer: B. Triploid (3n)
PEN forms from the fusion of two haploid polar nuclei + one haploid male gamete = **triploid (3n)**. **Hence the endosperm tissue developing from PEN is also 3n.**
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