Choose the INCORRECT statement regarding to the syngamy:

Syngamy refers to the post fertilisation event.

The correct answer is Option (3) -Syngamy refers to the post fertilisation event.

The most vital event of sexual reproduction is perhaps the fusion of gametes. This process called syngamy results in the formation of a diploid zygote. It is a fertilisation event not a post fertilisation event. The term fertilisation is also often used for this process. The terms syngamy and fertilisation are frequently used though, interchangeably. 

In most aquatic organisms, such as a majority of algae and fishes as well as amphibians, syngamy occurs in the external medium (water), i.e., outside the body of the organism. Organisms exhibiting external fertilisation show great synchrony between the sexes and release a large number of gametes into the surrounding medium (water) in order to enhance the chances of syngamy. This happens in the bony fishes and frogs where a large number of offspring are produced. 

    In many terrestrial organisms, belonging to fungi, higher animals such as reptiles, birds, mammals and in a majority of plants (bryophytes, pteridophytes, gymnosperms and angiosperms) syngamy occurs inside the body of the organism. In all these organisms, egg is formed inside the female body where they fuse with the male gamete.