Secondary nucleus is formed by.

Egg apparatus

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Fusion of two polar nuclei

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Degenerating synergids

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Antipodal cells

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Solution

The correct option is B Fusion of two polar nuclei
The secondary nucleus formed by the fusion of two polar nuclei is also called definitive nucleus. Vegetative nucleus and Generative nucleus are present in the young pollen grain when the Microspore divides mitotically to form a large vegetative cell and a small generative cell. Primary endosperm nucleus is formed by the fusion of male gamete with a diploid secondary nucleus.

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