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If an angiospermic male plant is diploid and female plant tetraploid, the ploidy level of endosperm will be

1. haploid
2. triploid
3. tetraploid
4. pentaploid

Correct answer: pentaploid

Solution

In angiosperms, endosperm forms when one sperm nucleus fuses with the two polar nuclei. A diploid male plant produces haploid sperm, while a tetraploid female plant produces diploid egg and polar nuclei, so the endosperm gets 1 set from sperm and 4 sets from the two polar nuclei combined, making it pentaploid.

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