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 risk factors and some epidemiological data, This assignment is a 15...

This assignment is a 1500 word 'clinical update' journal article. The format for this article is similar to that of the 'ANF clinical update' series published in the Australian Nur

Special anatomic considerations in posterior maxilla, What are the special ...

What are the special anatomic considerations in posterior maxilla?  Posterior maxilla has very poor  quality of bone demanding special consideration in implant placement. These

Cutin, CUTIN It is a lipid formed by polymerization and cross-esterific...

CUTIN It is a lipid formed by polymerization and cross-esterification of hydroxy fatty acids. Cutin occurs inside outer epidermal walls of plant surfaces as bringing agent t

What are holandric genes, What are holandric genes? The Holandric genes...

What are holandric genes? The Holandric genes are genes situated in the nonhomologous region of the Y chromosome. Holandric genes condition phenotypes that emerge only in men s

Which type of defense cell do bacteria attract, Which type of defense cell ...

Which type of defense cell do bacteria attract and cause to multiply during the inflammation process? What is the name given to the waste material produced by the inflammation trig

What are the colors absorbed by plants, Q. What are the colors (of the elec...

Q. What are the colors (of the electromagnetic spectrum) absorbed by plants? What would happen to photosynthesis if the green light waves that reach a vegetable were blocked? C

Pluripotent scs:grouping of stem cells, Pluripotent SCs : Characterizing...

Pluripotent SCs : Characterizing more restricted abilities for differentiation.their sources are some celles blastocyst (5-14 days) embroys, so can from over 200 cells types i.e

Locomotion in annelida, Locomotion in Annelida Before we discuss the ...

Locomotion in Annelida Before we discuss the details of locomotion in annelids, we have to recapitulate the major subdivisions of the phylum Annelida. Phylum Annelida contain

How many asymmetric carbons ribose has, How many asymmetric carbons are the...

How many asymmetric carbons are there in ribose and glucose?

Concentration gradient and passive and active transport, Q. What is the rel...

Q. What is the relationship between concentration gradient and passive and active transport? Passive transport is the movement of substances across membranes in favour of their

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