A pond contains a large cluster of jelly-like eggs laid by a female frog. What is the most likely mode of fertilisation in frogs?
External fertilisation in water
Frogs are amphibians that reproduce sexually, and their reproduction is closely tied to water bodies such as ponds.
During breeding, the female frog releases a large number of eggs, covered in a protective jelly-like coating, directly into the water.
The male frog then releases sperm over these eggs outside the body, so fertilisation takes place externally in the surrounding water rather than inside the female's body.
Hence, the most likely mode of fertilisation in frogs is external fertilisation in water.
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