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

Translation in eukaryotes, Transcription in eukaryotes, a much more complex...

Transcription in eukaryotes, a much more complex procedure than in prokaryotes. In the eukaryotes, translation and transcription take place in several cellular compartments that ar

Name the term concerning with genetic principals of humans, Which of the be...

Which of the below refers to science concerned with the application of genetic principles to improvement of the human species? a) Eugenics b) Assortive mating c) Holandri

Define ecosystems science and large-scale ecology, Define Ecosystems scienc...

Define Ecosystems science and large-scale ecology? Many of today's most pressing problems are regional or global in nature including for instance, the effects of land cover and

Life cycle of malarial parasite, Life cycle of malarial parasite Whe...

Life cycle of malarial parasite When the mosquito sucks the blood, gametocytes enter its digestive system. They migrate into the walls of the digestive system and undergo

Urine collection, Urine Collection: Untimed or random urine specimens ...

Urine Collection: Untimed or random urine specimens are suitable only for few chemical tests (mainly qualitative test). Usually urine sample is collected over a predetermined

Explain pediculosis and scabies, Pediculosis and scabies  Phthirus pubi...

Pediculosis and scabies  Phthirus pubis (pubic lice), which can be found on eyelashes, back, axillary and leg hairs as well as pubic areas, and Sarcoptes scabiei infestation (s

What do you mean by linnaeus binomial system, Q. What do you mean by Linnae...

Q. What do you mean by Linnaeus binomial system? Almost a century after Bauhin the great Swiss naturalist Carolus Linnaeus (1707-1778) published the two monumental works the "S

What is the secondary structure of a protein, What is the secondary structu...

What is the secondary structure of a protein? The secondary protein structure is formed by the manner its amino acids interact by the intermolecular bond. These interactions ma

Exon, Exon are those parts of a genomic DNA sequence which will be represe...

Exon are those parts of a genomic DNA sequence which will be represented in final, mature mRNA t A contiguous segment of the genomic DNA which codes for a polypeptide in the gene.

Blood plasma - circulation, Blood Plasma - Circulation Centrifugation...

Blood Plasma - Circulation Centrifugation of blood results in its separation into two portions - a packed mass of cells which constitute around 45 per cent of the volume of t

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