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

Explain about pergingival regenerative therapy, Explain about Pergingival R...

Explain about Pergingival Regenerative Therapy In case of one stage implants being treated or when the prosthesis has to be maintained a  Pergingival Regenerative Therapy is d

Describe in brief about retina, Describe in brief about retina The reti...

Describe in brief about retina The retina is a highly complex layer of nervous tissue. The photoreceptors are rods and cones for scotopic and photopic vision respectively. The

Explain nutritional properties of the eggs, Explain nutritional properties ...

Explain nutritional properties of the eggs Drying of eggs under normal conditions causes little loss of the nutritional properties of the eggs. Vitamin A, vitamin B, thiamine,

Which organs are protected by the skull, Which organs are protected by (a) ...

Which organs are protected by (a) the skull, (b) the rib cage, (c) the vertebrae?   a) The skull safe the brain, b) the rib cage safes the heart, lungs, liver and spleen,

How the allele frequencies in a population, A dominant allele will always i...

A dominant allele will always increase in frequency over time. Yes No Q44. When a gene has two alleles, the allele frequencies in a population automatically move toward an equilibr

Most appropiate hypothesis about the origin of life on earth, What is the m...

What is the most accepted hypothesis about the origin of life on earth? How does it compare to the other main hypotheses? The heterotrophic hypothesis is the strongest and most

What is retrograde peri-implantitis, Retrograde Peri-Implantitis It has...

Retrograde Peri-Implantitis It has been described by Misch as implant failure probably due to bone microfractures caused by premature implant loading or overloading, other form

Draw a class diagram, Draw a class diagram: You are required to provid...

Draw a class diagram: You are required to provide a practical implementation in C++ for the following class diagram. You have to provide the solution in the form of classes in

Walrasian model, Normal 0 false false false EN-IN X-N...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Meiosis comprises two separate divisions, All of the following make meiosis...

All of the following make meiosis different from mitosis; EXCEPT A. Meiosis comprises two separate divisions. B. Meiosis only occurs during embryonic development. C. Chromoso

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