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

Determine the width of attached gingiva at implant site, Width of Attached ...

Width of Attached Gingiva at Implant Site The zone of attached gingiva needs to be intact and of adequate width to protect (by separating) the tissue around the implant. If it

Nucleic acids, Why is the number of bonds important in nucleic acids

Why is the number of bonds important in nucleic acids

Sporophytic and gametophytic self-incompatibility, Sporophytic and Gametoph...

Sporophytic and Gametophytic Self-Incompatibility Besides the categories based on morphology, self incompatibility can be further classified into sporophytic or gametophytic t

Define the high blood plasma levels of progesterone, Z is a healthy adult f...

Z is a healthy adult female who ovulates in each menstrual cycle; Z is not pregnant.  During Z's menstrual cycle, high blood plasma levels of progesterone   A. Occur just prior

Fermentation, outline the process of yeast fermentation stating all enzymes...

outline the process of yeast fermentation stating all enzymes involved

Explain medical nutrition therapy, Medical Nutrition Therapy Medical Nu...

Medical Nutrition Therapy Medical Nutrition Therapy  (MNT) is defined as  the  assessment of  the  nutritional status of  a client  followed  by  nutrition  therapy ranging Pon

Major divisions of the chordate phylum, Q. What are the two major divisions...

Q. What are the two major divisions of the chordate phylum? Chordates are divided into vertebrates and protochordates (urochordates and cephalochordates). Q. What are the d

What is meant by the arch reflex, What is meant by the arch reflex? In ...

What is meant by the arch reflex? In some situations the movement of the skeletal striated muscles does not depend upon commands of the superior motor neurons, i.e., it is not

What is conventional breeding, What is Conventional breeding Conventio...

What is Conventional breeding Conventional breeding is a process in which genes for pesticidal traits are introduced into a plant by natural methods, such as cross-pollination

Define absorption, Define Absorption, Storage and Elimination of ascorbic a...

Define Absorption, Storage and Elimination of ascorbic acid? Ascorbic acid is rapidly absorbed from the intestines primarily by active transport.  Simple diffusion or carrier-m

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