How can we say that fish exhibits external fertilisation ? - Vidyadip

Question

How can we say that fish exhibits external fertilisation ?

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Answer

Female fish lays eggs in water while male fish releases sperms in water. Sperms swim and reach the eggs of fish randomly due to water currents.
When a sperm comes in contact with the viable egg, nuclei of both the cells fuse to form a zygote. This process of fertilisation takes place in water outside the female body, hence fertilisation is external in fishes.

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