Spermatophores, Biology

Assignment Help:

Spermatophores

Many non-chordates do not release free sperms during copulation. They have a mechanism to bundle and enclose a number of sperms in a sheath usually made of gelatinous material. Such bodies are called spermatophores. Most insects, the centipedes and certain molluscs produce spermatophores. Male centipede emits spermatophores and places it on a web already made. The female picks up the spermatophores and takes it into her genital opening. In many male cephalopods such as Loligo and Argonauta one of the arms gets specialised for the transfer of spermatophore into the females. Such an arm is called hectocotylized arm. The spermatophore, after having been deposited in the female, finally releases the sperms which move into the female ducts or the spermathaca.


Related Discussions:- Spermatophores

Define intermediate level of the numeric pyramid, In the short term what wi...

In the short term what will happen to the levels above and below a population of secondary consumers of a numeric pyramid if a large number of individuals from this population dies

Photoperiodism was first characterised, Photoperiodism was first characteri...

Photoperiodism was first characterised in : 1. Tobacco 2. Potato 3. Tomato 4. Cotton Tobacco is the first in whic photoperiodism characterised.

Sulphur cycle, Sulphur is one of important of proteins vitamins and hormone...

Sulphur is one of important of proteins vitamins and hormones. It plays a very crucial role in health of both plants and animals. Most of earth sulphur is tied up in rocks and salt

Suprasternal views, These views are obtained by placing the transducer in t...

These views are obtained by placing the transducer in the suprasternal notch with the ridge pointing cephalad. The neck is extended during the suprasternal notch examination. Thi

What is self-jamming, What is Self-jamming Unless all of the mobile cli...

What is Self-jamming Unless all of the mobile client are perfectly synchronized, the arriving transmissions from multiple clients will not be perfectly aligned on chip boundari

Define cause of vitamin a deficiency - infections, Define cause of vitamin ...

Define cause of vitamin a deficiency - Infections? During acute infections, vitamin A intake in preschool children is reduced due to impaired appetite and impaired vitamin A ab

What are some diseases caused by abnormal gh secretion, What are some disea...

What are some diseases caused by abnormal GH secretion by the hypophysis? In childhood deficient GH secretion might be lead to delayed growth and in severe cases to nanism (dwa

Computed tomography, C omp uted tomography: Computed tomogr...

C omp uted tomography: Computed tomography (CT imaging) is also known as CAT (computed axial tomography) scanning and it is based on the X-ray principle. The CAT sc

Female reproductive disorders-dystocia, Dystocia Dystocia or difficult...

Dystocia Dystocia or difficult calving is a condition where help is required as providing traction, repositioning of fetus, foetotomy or caesarotomy. Generally, ease of calvin

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