Explain the site of syngamy and its types in different organisms.

(N/A) Syngamy (fertilisation) occurs either outside or inside the body of the organism. Based on this,it is classified as external or internal fertilisation.
External Fertilisation: In most aquatic organisms,such as a majority of algae and fishes as well as amphibians,syngamy occurs in the external medium (water). This is called external fertilisation. Organisms exhibiting external fertilisation show great synchrony between the sexes and release a large number of gametes into the surrounding medium (water) to enhance the chances of syngamy.
In bony fishes and frogs,a large number of offspring are produced. $A$ major disadvantage is that the offspring are extremely vulnerable to predators,threatening their survival up to adulthood.
Internal Fertilisation: In many terrestrial organisms,such as fungi,higher animals (reptiles,birds,mammals),and a majority of plants (bryophytes,pteridophytes,gymnosperms,and angiosperms),syngamy occurs inside the body of the organism. This is called internal fertilisation.
In these organisms,the egg is formed inside the female body where it fuses with the male gamete.
In organisms exhibiting internal fertilisation,the male gamete is motile and reaches the egg for fusion.
Although a large number of male gametes are produced,the number of eggs produced is significantly lower.
In seed plants,non-motile male gametes are carried to the female gamete via pollen tubes.