The two pre-fertilization events from the given list are namely as follows: i) Gametogenesis and ii) Pollination.
i. Gametogenesis- It is the process in which two types of gametes (male and female) formed.
ii. Pollination- Pollination is the process in which the transfer of pollen grains from the anther to the stigma of the flower takes place.
iii. Syngamy- Syngamy is referred to as an event of the double fertilization in which the fusion of gametes takes place.
iv. Embryogenesis- The process of development of an embryo from the zygotes is known as embryogenesis.
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