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

Describe the metabolism of lipids, Q. Describe the metabolism of lipids? ...

Q. Describe the metabolism of lipids? Fats are split into fatty acids and glycerol by the enzyme. They are absorbed in small intestine and recombined into fats. It is stored in

What is anti-arrhythmic pacemaker defibrillators, What is Anti-arrhythmic p...

What is Anti-arrhythmic pacemaker defibrillators ? Antiarrhythmic drugs (AADs) are classified according to whether they exert blocking actions predominantly on sodium, potassiu

Express how that system accomplishes that necessity, Name a system that acc...

Name a system that accomplishes that necessity and explain how that system accomplishes that necessity.

Explain secretion of parathormone and calcium blood level, What is the rela...

What is the relation between secretion of parathormone and the calcium blood level? The parathormone enhances the calcium blood level as it stimulates the resorption (remodelat

Plants, why roots grow downword

why roots grow downword

Explain about the browning reactions, Explain about the Browning Reactions?...

Explain about the Browning Reactions? The Browning Reactions are complex reactions which occur when foods are processed. In some the brown flavour is highly desirable and is in

Determine amount of intracellular potassium ions in neuron a, Determine amo...

Determine amount of intracellular potassium ions in neuron A Neuron A is a healthy neuron with all the usual ion channels.  When at rest with a membrane voltage of R millivolts

Define the nutritional and functional role of nickel, Minerals :-Nickel  ...

Minerals :-Nickel  Food Source      Plant foods  Nutritional Functional role Essential nutrient: Deficiency in humans unknown. Catalyst: hydrogenation in

Smooth muscles, Normal 0 false false false EN-IN X-NO...

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

How many cellular nuclei does the pollen tube of angiosperms, Q. How many c...

Q. How many cellular nuclei does the pollen tube of angiosperms have? What is ploidy of each of these nuclei? The pollen tube explicitly the mature male gametophyte of angiospe

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