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

Methods of virus, How Viruses Multiply? Obligatory parasitism - Outsi...

How Viruses Multiply? Obligatory parasitism - Outside cells viruses are nonliving, inactive   particles but after entering into live cells these multiply fast by replication

Dilute this concentration of cells to yield 300 cells, For a particular ass...

For a particular assay, you require cells at a concentration of 300 cells per ml. In your flask of cells growing you counted a sample using a hemacytometer and found that you have

Explain acylglycerols, Explain acylglycerols The most abundant class of...

Explain acylglycerols The most abundant class of food lipids is the acylglycerols, also known as glycerol esters of fatty acids, which dominate the composition of depot fats in

Obelia, why is it consideredto have an intermideate grade oforganisation

why is it consideredto have an intermideate grade oforganisation

What would be in the solution, Before you solve the problem organize your t...

Before you solve the problem organize your thoughts on paper in the following manner. A) What will my answer look like? What units will I be using? B) What do I need to know

Protozoa., show me the schamatic diagram of chrysomoeba?

show me the schamatic diagram of chrysomoeba?

How auxins act helping the lateral growth of the stem, How auxins act helpi...

How auxins act helping the lateral (secondary) growth of the stem? The Auxins stimulate the formation of conductive vessels, phloem and xylem, promoting the thickening of the s

Define the role of fluorine in human body, Define the role of Fluorine in H...

Define the role of Fluorine in Human Body? Fluorine is potentially a toxic element. Its essentiality for humans is not established although the role of fluoride in providing pr

Allele-specific ligation, Allele-specific ligation  is the technique permit...

Allele-specific ligation  is the technique permitting discrimination of two allele at locus by giving two short synthetic oligonucleotides which would bind ajjacent to teach other

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