How many haploid nuclei are present in a matu | vedclass

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(C) In most angiosperms,pollen grains are shed at the $2$-celled stage. These $2$ cells consist of one vegetative cell and one generative cell. The ge

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(C) In most angiosperms,pollen grains are shed at the $2$-celled stage. These $2$ cells consist of one vegetative cell and one generative cell. The generative cell later divides to form $2$ male gametes. Therefore,at the time of fertilization (when the pollen tube reaches the micropyle),the pollen grain contains $3$ haploid nuclei: $1$ vegetative nucleus and $2$ male gamete nuclei.

How many haploid nuclei are present in a mature pollen grain at the time of its release or when it reaches the stigma/micropyle?

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