Botany - Sexual Reproduction in Flowering Plants Question with Solution | TestHub

When Tetraploid female is crossed with diploid male then

Diploid male$\left(2\mathrm{n}\right)$- Microspore mother cell$\left(2\mathrm{n}\right)$- Pollen grain$\left(\mathrm{n}\right)$-Male gamete$\left(\mathrm{n}\right)$

Tetraploid female$\left(4\mathrm{n}\right)$- Megaspore mother cell (4n)- Megaspore$\left(2\mathrm{n}\right)$- Embryo sac$\left(2\mathrm{n}\right)$

Embryo = Male gamete + Female gamete$\mathrm{ }=\mathrm{n}+2\mathrm{n}=3\mathrm{n}$

Endosperm = Male gamete + Secondary nucleus$=\mathrm{n}+4\mathrm{n}=5\mathrm{n}$

Fruit is developed by ovary which is sporophytic in nature. 4n ploidy is present in ovary so fruit has also 4n ploidy.