Potato multiplies vegetatively by

In angiosperms, the female gametophyte is represented by the

In angiosperms, syngamy is required for the formation of

Ginger is multiplied vegetatively by means of

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Pollen tube is produced by

Exine of pollen grains is composed of

Ovules are also called

Ploidy level of endosperm in angiosperms is generally

The fusion of second male gamete with secondary nucleus is called