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

State the definition of temperature, State the Definition of Temperature ...

State the Definition of Temperature Temperature may be defined as degree or amount of body heat.  It is the balance between heat produced and heat lost by the body.  It is meas

Define briefly about the selenium, Define briefly about the Selenium? T...

Define briefly about the Selenium? The element selenium was discovered in 1817 in association with the element sulphur. However, selenium as an essential nutrient remained unre

Define the parts of specific immune or defense mechanisms, The specific imm...

The specific immune (defense mechanisms) response can be broadly classified into two types: a)  Cell mediated immune response: This  is achieved through large number of acti

Sucession, what is the model of tolerence mpdel of sucession

what is the model of tolerence mpdel of sucession

Describe the method of molecular photo copying, Question 1: "Plant tiss...

Question 1: "Plant tissue culture now has direct commercial applications" Explain. Describe plant tissue culture Illustrate importance of plant tissue culture Sho

Air pollution - environmental pollution, Air Pollution - Environmental Poll...

Air Pollution - Environmental Pollution The threat due to air pollution became apparent only when some severe episodes caused human casualty in USA, Britain (London) and Japan

What are the hyphae and the mycelium of pluricellular fungi, What are the h...

What are the hyphae and the mycelium of pluricellular fungi? The major structures of pluricellular fungi are the hyphae (threadlike filaments made of contiguous uni or multinuc

Explain mitosis properly, Q. Does the mitosis properly occur after or befor...

Q. Does the mitosis properly occur after or before the interphase? Is it a simple "point of view" issue? Mitosis have to be considered a succeeding phase after interphase since

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