Question

explain fertilization and development in Pheretima​

Answer 1

Answer:

During copulation, two earthworms get attached through their ventral surface with their anterior end pointing in opposite direction. The male genital aperture become erected and inserted into the spermathecal pore of each other. ... The fertilization in earthworms is external and takes place in the cocoons.

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Answer 2

Fertilization and development in Pheretima:

• Pheretima is a long, narrow and cylindrical shaped earthworms that belong to the Phylum Annelida.

• Earthworms are hermaphrodites which means the presence of 'both male and female reproductive organs' in the same organism.

• External fertilisation takes place in Pheretima.

• Fertilization and development occur inside the Cocoons

• The cocoons are deposited in the soil.

• When the earthwarms are in mating, exchange their sperms between them. It is called as copulation.

• After copulation, the worms are separated from each other.

• When the ovaries mature, they produce cocoons which are produced by the gland cells of Clitellum.

• Inside the cocoon, the sperm and the egg fuses.

• The fertilised egg grows as a young worm. Here there is no larval stage.

Learn more about Pheretima, Annelida

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