(B) In $Pinus$,the male gametophyte is highly reduced and is confined to only a limited number of cells. The pollen grain at the time of shedding cons

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(B) In $Pinus$,the male gametophyte is highly reduced and is confined to only a limited number of cells. The pollen grain at the time of shedding consists of $4$ cells: $2$ prothallial cells,$1$ generative cell,and $1$ tube cell. Therefore,the male prothallus in $Pinus$ contains $2$ prothallial cells.