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

Can you explain mitotic apparatus, Q. What is mitotic apparatus? Mitoti...

Q. What is mitotic apparatus? Mitotic apparatus is the set of aster fibers, radial structures around each centriole pair, plus the spindle fibers, fibers that extend across the

Define starches, Normal 0 false false false EN-IN X-N...

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

Explain about simple proteins, Explain about Simple proteins Simple pro...

Explain about Simple proteins Simple proteins are those which are made of amino acid units only joined by peptide bond.  Upon hydrolysis they yield a mixture of amino acids and

Explain the secondary structure of proteins, Explain the Secondary structur...

Explain the Secondary structure of proteins The secondary structure of a protein involves the way that the chain of amino acid either twists or folds back upon itself to form a

Gene pool, Natural selection can therefore mean differential reproduction a...

Natural selection can therefore mean differential reproduction among members of the sarne gene pool. We earlier said that selection would promote those alleles that give rise to ph

The seven levels of taxonomy, how are the listed from largest group to smal...

how are the listed from largest group to smallest group

Reaction wood - root and shoot morphogenesis, Reaction Wood - Root and Shoo...

Reaction Wood - Root and Shoot Morphogenesis As a plagiotropic branch elongates, it might be expected to bend, downwards because of its increased weight and distance from the

Define energy requirements of infants, Define Energy requirements of infant...

Define Energy requirements of infants? Energy: Energy requirements of infants are based on the energy intake through breast milk by infants of well-nourished mothers. Based on

State the types of blood vessels, Blood Vessels There are three types o...

Blood Vessels There are three types of blood vessels. They are: 1) Arteries: Arteries carry blood from heart to different organs. They have thick wall. 2) Veins: Vein

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