When pollen tube enters through micropyle, the process is called

Step-by-step solution

The pollen tube may enter the ovule by following one of three routes given below: (1) Porogamy Pollen tube enters the ovule through micropyle, e.g., most angiosperms. (2) Mesogamy Pollen tube enters the ovule through integuments (e.g., Cucurbita) or through funiculus (e.g., Pistacia). (3) Chalazogamy Pollen tube enters the ovule through chalazal tissues, e.g., Casuarina, Beta vulgaris, Juglens regia, etc.