Mesogamy is a pollen tube that enters the embryo sac through the funiculus or the integument.
The term for the entry of the pollen tube into the ovule through the micropyle is "micropylar penetration." This process is essential for fertilization to occur in plants.
Pollen grain absorbs sugary secretions of the stigma, swells in size, exine (Outer wall of the pollen grin)ruptures and intine (Inner wall of the pollem grain) develops into a long tube called pollen tube. it passes through out the length of style and enters into the ovary and then into ovule by either of three methods. porogamy : It enters into the ovule through the micropyle.(Opening of the ovule) chalazogamy : It enters through the chalaza. Mesogamy : It enters either through integuments or through funicle. (Stalk of the ovule)...