How much time is generally required by the pi | vedclass

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(B) In the life cycle of $Pinus$ (a gymnosperm),pollination occurs when pollen grains are transferred to the ovule. However,the pollen tube growth is

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Thirteen months

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(B) In the life cycle of $Pinus$ (a gymnosperm),pollination occurs when pollen grains are transferred to the ovule. However,the pollen tube growth is very slow. It generally takes about $13$ months from the time of pollination to the time of fertilization,during which the male gametophyte matures and fertilization eventually occurs.

How much time is generally required by the pine plant from pollination to fertilization?

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