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

Prevention - rheumatic fever, Acute GAS pharyngitis should be treated promp...

Acute GAS pharyngitis should be treated promptly by penicillin or other antibiotics. Indian Council of Medical Research (ICMR) recommends that all cases of pharyngitis must receive

Central and peripheral nervous systems, The brain is only a part of a large...

The brain is only a part of a larger nervous system that extends to each part of the body. The nervous system can be divided into central nervous system (CNS), which consists of th

How vitamin e is directly related to vitamins a, How vitamin e is directly ...

How vitamin e is directly related to Vitamins A, D and K? A high intake of vitamin E interferes with the functions of other fat-soluble vitamins such as vitamin K absorpt

Why is it significant that exact copies of dna, Why is it significant that ...

Why is it significant that exact copies of DNA are produced during replication? Producing exact copies make sure that when a cell divides, the offspring cells will receive the

Zooology, green gland is excretory organ of which orthopodic phylem

green gland is excretory organ of which orthopodic phylem

How does the amoeboid movement occur, How does the amoeboid movement occur?...

How does the amoeboid movement occur? What are examples of beings and cells that use such movements for locomotion? Amoeboid movements are formed by cytoplasmic movements and p

Blunt or non-penetrating injury, Blunt or Non-penetrating Injury When ...

Blunt or Non-penetrating Injury When body is struck by a blunt object such as steering wheel or blows to chest with blunt object. External injury may appear minor but the

Show major treatments of diabetes mellitus, Q. What are the major treatment...

Q. What are the major treatments of diabetes mellitus? The general goal of the diabetes curing is to keep normal glycemic levels. Type I diabetes is treated with parenteral

Define the disturbances in fluid balance, Define the Disturbances in Fluid ...

Define the Disturbances in Fluid Balance? The correct functioning of cells and tissues depends on appropriate concentrations of nutrients; so any abnormal loss or accumulation

How computed tomography helps the doctors, Explain briefly how computed tom...

Explain briefly how computed tomography (CT) helps the doctors in pinpointing the defects in the patient's body

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