<P> Another germination event during the life cycle of gymnosperms and flowering plants is the germination of a pollen grain after pollination . Like seeds , pollen grains are severely dehydrated before being released to facilitate their dispersal from one plant to another . They consist of a protective coat containing several cells ( up to 8 in gymnosperms , 2 - 3 in flowering plants ) . One of these cells is a tube cell . Once the pollen grain lands on the stigma of a receptive flower ( or a female cone in gymnosperms ) , it takes up water and germinates . Pollen germination is facilitated by hydration on the stigma , as well as by the structure and physiology of the stigma and style . Pollen can also be induced to germinate in vitro ( in a petri dish or test tube ) . </P>
<P> Another germination event during the life cycle of gymnosperms and flowering plants is the germination of a pollen grain after pollination . Like seeds , pollen grains are severely dehydrated before being released to facilitate their dispersal from one plant to another . They consist of a protective coat containing several cells ( up to 8 in gymnosperms , 2 - 3 in flowering plants ) . One of these cells is a tube cell . Once the pollen grain lands on the stigma of a receptive flower ( or a female cone in gymnosperms ) , it takes up water and germinates . Pollen germination is facilitated by hydration on the stigma , as well as by the structure and physiology of the stigma and style . Pollen can also be induced to germinate in vitro ( in a petri dish or test tube ) . </P>
where does the germination of pollen grains take place
where does the germination of pollen grains take place
on the stigma of a receptive flower ( or a female cone in gymnosperms )
on the stigma of a receptive flower ( or a female cone in gymnosperms )