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

Botany, Suggest a mechanism that would allow a plant to grow better if it h...

Suggest a mechanism that would allow a plant to grow better if it had intermorph neighbors than if it had intramorph neighbors. Think about the degree of genetic similarity between

Porifera - regeneration in invertebrates, Porifera - Regeneration in Invert...

Porifera - Regeneration in Invertebrates Sponges have immense regenerating ability and show two ways of doing so as displayed below. : (a) Regeneration from small segments-

Give some examples of cloning and molecular biology, Examples of cloning an...

Examples of cloning and molecular biology cloning may produce heterozygous individuals (as mother was heterozygous) and suggests a way to get pure breeding cats molecu

Similarities and differences between the two species, Compare the teeth of ...

Compare the teeth of Australopithecus afaensis and Homo sapiens. a)Describe the similarities and differences between the two species. b) Write a hypothesis about dietary difference

Find out risk factors for coronary disease, Q. Find out risk factors for co...

Q. Find out risk factors for coronary disease? 1) Tobacco Smoking, the single most preventable cause of death is a leading risk factor for CAD, cerebrovascular accident and

Explain terms of osmosis, A red blood cell has an internal salt concentrati...

A red blood cell has an internal salt concentration of 150mM. The cell is placed in a beaker of 500mM salt. (a) Assuming that the cell membrane is permeable to water but not to

Standardisation research of luria nebraska, Standardisation Research of Lur...

Standardisation Research of Luria Nebraska There are published manuals for the Luria Nebraska that define the battery in detail and provide information pertinent to validity,

What are complementary genes, What are complementary genes? Does this inher...

What are complementary genes? Does this inheritance pattern obey Mendel's second law? Complementary genes are the different genes that act together to determine a given phenoty

Endosperm with lateral haustoria, Endosperm with Lateral Haustoria In...

Endosperm with Lateral Haustoria In Monochoria, in which the endosperm development is of helobial type, the haustorium is neither chalazal nor micropylar but lateral. The cha

Explain pullulan, Pullulan Pullulan is a water soluble edible microbial...

Pullulan Pullulan is a water soluble edible microbial polysaccharide consisting of Maltotriose units (α 1 → 6), as shown in  the figure 2.12. It is produced by yeast  Aureobasi

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