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Q. In general, pollen tube enters the ovule through

J & K CETJ & K CET 2012Sexual Reproduction in Flowering Plants

Solution:

The pollen tube enters the ovule in majority of cases through micropyle by a process termed porogamy or it may enter through chalaza (chalazogamy) as in Casuarina.
In rare cases the pollen tube may pierce through integuments (mesogamy) as in Populus, Cucurbita.