Step 1: Understanding syngamy.
Syngamy refers to the fusion of male gamete with the female gamete during fertilization.
Step 2: Syngamy in angiosperms.
In angiosperms, one male gamete fuses with the egg cell (oosphere) to form a diploid structure called the oospore.
Step 3: Differentiating related terms.
Egg and oosphere refer to the female gamete before fertilization.
PEN (Primary Endosperm Nucleus) is formed by triple fusion, not syngamy.
Step 4: Conclusion.
Hence, the product of syngamy in angiosperms is the oospore.