Fertilization in earthworm, Biology

Assignment Help:

In earthworms, when the ovaries mature, the clitellum secretes a viscous substance in the form of a girdle. This girdle hardens in to a cocoon around the clitellum. The ova are discharged into cocoon. When this cocoon moves over the spermathecae openings, the sperms which are already collected from another worm and stored in the spermathecae are discharged into the cocoon. The cocoon finally, comes out of the body and fertilization takes place in the cocoon. As it is taking place outside the body, it is called as "external fertilization".


Related Discussions:- Fertilization in earthworm

Define the nutritional and functional role of iodine, Minerals :- Iodine  ...

Minerals :- Iodine  Food Source      Iodised salt, sea food, plants and animals grown in areas where soil iodine is not depleted. Nutritional Functional role Esse

Male reproductive disorders-blockage of ducts, Blockage of ducts In so...

Blockage of ducts In some bulls there is a blockage of the transport of sperm through the epidydimis usually caused by a congenital non-patency of some part of the vasa effere

Illustrate the structure and functions of aqueous humour, Illustrate the St...

Illustrate the Structure and functions of aqueous humour Aqueous humour is a clear fluid that fills the anterior and posterior chambers of the eye and permeates the vitreous. I

Solar energy input, Solar Energy Input We know that the spectral distri...

Solar Energy Input We know that the spectral distribution and the intensity of solar radiation incident on the earth's surface are known. Of the enormous'amount of energy that

Define the concept of public nutrition, Define the Concept of Public Nutrit...

Define the Concept of Public Nutrition? The rapidly changing global trends in the area of food consumption patterns, lifestyles and environment have a tremendous impact on the

Post removal technique using prs kit, Post removal Technique using PRS kit ...

Post removal Technique using PRS kit -Transmetal efficiently doming the post head . -Select suitable sized trephine . -Place drop of RC prep on the post head as lubrican

Explain bone resorption, An  osteoclast  is a type of bone cell that absorb...

An  osteoclast  is a type of bone cell that absorbs bone tissue by removing its mineralized matrix and breaking up the  organic bone. This process is known as bone resorption

Gene recombinations, Which of the recombination process(transformation, con...

Which of the recombination process(transformation, conjugation and transduction) would be most likely to occur in the natural environment?

Name the organism included in symbiotic nitrogen fixation, Name the organis...

Name the organism included in symbiotic nitrogen fixation. What are the components needed for this pure? Determine their role. Differentiate among inbreeding and heterosis. The

Which organ releases the female gamete under formation, Q. What is the orga...

Q. What is the organ that releases the female gamete under formation? How is this release triggered? What is the organ that collects the released gametes? The organ that libera

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd