Final answer:
Syngamy is the fusion of two gametes to form a zygote, while triple fusion involves one sperm cell combining with two polar nuclei during double fertilization in flowering plants. Porogamy is the entry of the pollen tube through a micropyle to enable sperm cells to fertilize the egg.
Step-by-step explanation:
Syngamy is the process of the union of two gametes in fertilization, leading to the formation of a zygote. This is a crucial step in sexual reproduction in a vascular plant, which is a type of plant with a network of tubes for transporting water and nutrients. The process of syngamy ensures genetic diversity and involves two steps: plasmogamy, which is the fusion of the cell membranes, and karyogamy, which is the fusion of the nuclei.
Triple fusion refers to a unique event in the sexual reproduction of flowering plants where one sperm cell fuses with two polar nuclei to form the triploid endosperm, a nutritive tissue that supports the developing embryo. This is part of the process called double fertilization, which also includes the syngamy of one sperm cell with the egg.
Porogamy is a type of fertilization process where the pollen tube, through which the sperm cells travel, enters the ovule through the micropyle, a tiny opening in the ovule's integuments. This allows the sperm cells to reach the egg cell for fertilization.