Types of Fertilization Depending upon the place of entry of the pollen tube into the ovule, three types of fertilization have been
recognized. They are Porogamy, Chalazogamy and Mesogamy.
Porogamy - It the most common type of fertilization seen in angiosperm plants. In porogamy, the entry of
the pollen tube into the ovule takes place through the micropyle.
Chalazogamy - In chalazogmay, the pollem tube enters thorugh the chalaza. It can be seen in Casuarina
plants.
Mesogamy - Mesogamy is seen in Cucurbita plants. Here, the pollen tube enters through the integuments of
the ovule.
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