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

What are the genotype and phenotype of the unknown male, For Dalmation dog,...

For Dalmation dog, the spotted condition is dominant to non-spotted. a) Using a Punnet square, show a cross between two heterozygous parents. b) A spotted female Dalmation dog is m

Exchange list vs. food composition tables for menu planning, Define Exchang...

Define Exchange list vs. Food composition tables for menu planning? A dietician is frequently expected to make quick, yet reasonably accurate estimation of the nutritive value

Absorption of glucose, Normal 0 false false false EN-IN...

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

Prognosis, The course and ultimate prognosis of ARF is usually directly rel...

The course and ultimate prognosis of ARF is usually directly related to the severity of carditis. The course and prognosis also depends upon recurrence of rheumatic fever. In pre-p

Male reproductive system - penis, PENIS - Intromittent organ. Erecti...

PENIS - Intromittent organ. Erectile, its apex is penis glanse. Covered by prepuce (part of skin). Main function is insemination (To transfer sperms in vagina in deep).

Transpiration the only way through which leaves lose water, Is the transpir...

Is the transpiration the only way through which leaves lose water? The Plants don't only lose water as vapor as by transpiration. Leaves also lose liquid water by a phenomenon

Essentiality of phosphorus for growth of microorganism, Define Essentiality...

Define Essentiality of Phosphorus for Growth of Micro-Organism Phosphorus is used in the form of phosphate salt by microorganisms. It is involved in formation of nucleic acids,

Under which conditions aerobic cells carry out fermentation, Q. Under which...

Q. Under which conditions do aerobic cells carry out fermentation? Some cells that usually obtain energy from aerobic cellular respiration can perform fermentation when oxygen

Define solubility affecting absorption of dietary iron, Define Solubility a...

Define Solubility affecting absorption of dietary iron? Solubility is crucial for non-haem iron absorption as the inorganic iron salts have to be solubilized in the intestine f

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