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Pollen grains are found only in Gymnosperms and Angiosperms.

1. Embryo sac is a female gametophyte which contains the egg apparatus.
2. Nucellus - 2n, antipodal cells - n
3. Antipodal cells - n, megaspore mother cell - 2n
4. Nucellus - 2n primary endosperm nucleus - 3n

Correct answer: Nucellus - 2n primary endosperm nucleus - 3n

Solution

Nucellus is part of the ovule’s sporophytic tissue, so it is diploid (2n). The primary endosperm nucleus forms when one male gamete fuses with the two polar nuclei, making it triploid (3n).

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