Q.If the tip of the pollen tube enters into the embryo sac of the ovule through micropyle then it is called

After germinating on a receptive stigma, the pollen tube grows chemotropically through the tissue of the style, guided by chemical signals from the pistil, and enters the ovary. Its path to the ovule may follow one of several routes, but entry through the micropyle -- termed porogamy -- is by far the most common in flowering plants. Less commonly the tube enters through the chalaza (chalazogamy, e.g. Casuarina) or through the integuments at some other point (mesogamy). Whatever the route, the pollen tube ultimately penetrates one of the synergids of the embryo sac through its filiform apparatus, and its tip r …