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 the estimation of inorganic phosphorus, Explain the Estimation of I...

Explain the Estimation of Inorganic Phosphorus? Most methods estimating inorganic phosphorus use the reaction between the phosphate and an acid molybdate. The hexavalent molybd

Define assessment of selenium status, Define Assessment of Selenium Status?...

Define Assessment of Selenium Status? Blood glutathione (GSH) peroxidase activity is directly related to blood selenium up to a level of 1.27 μmoles/L. Beyond this point, the a

An the heat capacity of water, Q. Can the heat capacity of water be conside...

Q. Can the heat capacity of water be considered small or large? What is the biological consequence of that characteristic? From Thermology it is acknowledged that the quantity

Archaeological records of human campsites, Archaeological Records of Human ...

Archaeological Records of Human Campsites Archaeological records of human campsites indicate that early humans started out as small bands of hunters who supplemented kills wit

Function of dopamine in consciousness, Q. Function of Dopamine in conscious...

Q. Function of Dopamine in consciousness? An increase in dopamine activity produces an increase in wakefulness. Dopaminergic neurons in the ventral tegmental areas are constant

How to increase the levels of physical activity, How to increase the levels...

How to increase the levels of physical activity? The benefits of physical fitness should be spread among the public through mass media. 1. Physical activity should be encour

Explain casein, Explain Casein Casein is an important example of protei...

Explain Casein Casein is an important example of protein, which can be boiled without apparent change in stability. The exceptional stability of casein makes it possible to boi

Nursing interventions in rheumatic fever, Nursing Interventions Pr...

Nursing Interventions Primary goals in acute rheumatic fever are:  Control and eradication of the infecting organism.  Prevent cardiac complications.  Relieve

Name the compound that is phosphorylated for atp formation, What is the com...

What is the compound that is phosphorylated for ATP formation? What is the resulting compound when ATP liberates energy? ATP, or adenosine triphosphate, is produced after the

Continuous suture technique-prosthetic aortic valve, Continuous suture tec...

Continuous suture technique: Monofilament 2'0' prolene sutures, which slide through easily, are used for this technique. three double armed prolene sutures are taken and with val

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