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

Endodermis , Endodermis is the layer of cells surrounding the vascular cyl...

Endodermis is the layer of cells surrounding the vascular cylinder of plants.

Genotype for each individual, The allele that causes albinism (p) is recess...

The allele that causes albinism (p) is recessive to the allele for normal pigmentation (P). A normal woman whose father is an albino marries an albino man whose parents are both no

What do you mean by nervous system, Q. What do you mean by Nervous System? ...

Q. What do you mean by Nervous System? Structural Organization:   CNS + PNS Functional Organization:   only concerned with PNS Sensory (Afferent) ->  CNS Motor (Effe

Find the magnitude and direction of the net electric force, Three point cha...

Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction of the net electric force on the 1.40 µC charge.

Extensive factor of luria nebraska procedure, Extensive factor of Luria Neb...

Extensive factor of Luria Nebraska procedure Extensive factor analytic studies have been accomplished, and the factor structure of each of the major scales has been recognized.

Epithelial tissue, EPITHELIA L TISSUE OR EPITHELIA Epithelium term coi...

EPITHELIA L TISSUE OR EPITHELIA Epithelium term coined by Ruysh, it was applied originally to thin skin covering the nipple. (G.epi = upon, thele = nipple) Epithelial tis

LPN, In many tests it is acceptable to read a positive result before the in...

In many tests it is acceptable to read a positive result before the incubation time is completed. why is this not the case with starch agar?

The non-oxidative phase generates ribose precursors, The non-oxidative ph...

The non-oxidative phase  generates  ribose precursors The non-oxidative phase of  the pathway,  including the following reactions, converts pentose-5-phosphate to other sugars.

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