Which type of fertilization takes place in frogs? What is the disadvantage of this type of fertilization?

Frogs undergo external fertilization, where eggs and sperms are released into water and fusion occurs outside the female's body. During breeding season, male frogs clasp females in an embrace called amplexus, and as the female releases eggs into the water, the male simultaneously releases sperms over them to maximize fertilization chances. This process typically occurs in ponds, streams, or temporary pools where environmental conditions trigger synchronized reproductive activity.

The primary disadvantage of external fertilization is its extremely low efficiency and high gamete wastage. Since fertilization depends on sperms randomly encountering eggs in an aquatic environment, vast numbers of gametes must be produced to ensure sufficient fertilization—yet many eggs remain unfertilized and countless sperms never reach any egg. Additionally, developing embryos face severe survival challenges: they are completely exposed to predators, water pollution, temperature fluctuations, desiccation if pools dry up, and fungal or bacterial infections. This vulnerability necessitates producing hundreds or thousands of eggs per female to ensure enough offspring survive to adulthood, representing a significant energy investment with no guaranteed return. Furthermore, external fertilization restricts frogs to breeding near water bodies, limiting habitat options and making reproduction impossible in dry conditions. In contrast, organisms with internal fertilization enjoy much higher fertilization success rates, can reproduce in terrestrial environments, and often provide parental care to protect developing embryos, though this strategy typically involves producing fewer offspring per reproductive event.