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A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be

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

Correct answer: pentaploid

Solution

A diploid female produces haploid eggs, while a tetraploid male produces diploid pollen. In angiosperms, endosperm forms by fusion of two maternal polar nuclei with one paternal sperm, giving 1n + 1n + 2n = 5n, so it is pentaploid.

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