Secondary nucleus formed by the fusion of two polar nuclei is also called

Vegetative nucleus

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Definitive nucleus

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Generative nucleus

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Primary endosperm nucleus

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Solution

The correct option is D Definitive nucleus
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.
So, the correct answer is B.

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