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 body mass index (bmi), Define Body Mass Index (BMI)? Weight for ...

Define Body Mass Index (BMI)? Weight for height as a marker of nutritional status has the advantage that it is independent of other factors that affect foetal outcome such as m

Explain vaccine of typhoid, Typhoid  Typhoid vaccine is recommended for...

Typhoid  Typhoid vaccine is recommended for travellers to developing countries in Central and South America, Africa and Asia, especially if they plan a long stay or may be livi

Mycoplasmosis-contagious caprine pleuropneumonia (ccpp), Contagious caprine...

Contagious caprine pleuropneumonia (CCPP) Mycoplasma mycoides subsp. capri (Mmc) is the main causative agent of caprine pleuropneumonia, a serious malady of goats in our countr

How to produce a similar sickling effect, Which of the following amino acid...

Which of the following amino acids would you expect to produce a similar sickling effect if placed at position 6? Select all that apply. 1. Arginine 2. Leucine 3. Lysine

Define itraconazole, Define Itraconazole Itraconazole is FDA-approved f...

Define Itraconazole Itraconazole is FDA-approved for treatment of blastomycosis, histoplasmosis (non-meningeal) and aspergillosis in patients who are intolerant of or refractor

Determine the significance of mesoglea, Determine the significance of Mesog...

Determine the significance of Mesoglea. The jellylike layer found between endodermal and ectodermal cell layers of diploblastic organisms. It acts as a type of cement holding t

What is more and less biologically complex, What is more and less biologica...

What is more and less biologically complex out of whey protien and ice cream and why?

Pulmonary ventilation, Pulmonary Ventilation: Pulmonary ventilation is th...

Pulmonary Ventilation: Pulmonary ventilation is the process by which gasses flow between the atmosphere and lung alveoli. Air moves into the  lungs when air pressure  inside the

Define regulation of malice enzyme by starvation & refeeding, Define regula...

Define regulation of malice enzyme by starvation & refeeding? ME catalyzes the oxidative decarboxylation of malate to pyruvate and CO 2 simultaneously generating the reduced

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