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I have read that most plant cells lack centrioles, though it may be seen in some lower plants. But what about the gametophyte of higher plants, angiosperms specifically?

As this diagram shows- enter image description here

The generative cell lacks a cell wall, as far as I know. But the generative cell also has to divide into the male gametes- how does this division occur without cell-plate formation? Is it via centrioles?

If this division occurs with the help of centrioles, how do they arise, since somatic cells divide by cell-plate formation?

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