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

Determine the food sources of vitamin a, Determine the Food Sources of Vita...

Determine the Food Sources of Vitamin A? Vitamin A or retinol performed vitamin A), as you may already know, is found only in foods of animal origin, such as milk, cheese, crea

Cells, What physical and metaboloic constraints limit cell size?

What physical and metaboloic constraints limit cell size?

Explain some features of aspergillus, Explain some Features of Aspergillus?...

Explain some Features of Aspergillus? The identifying features include: 1. Macroscopically Aspergillus colonies are powdery and are of different colours like green, blue, bl

Homework, why do ecological models commonly have limited applications?

why do ecological models commonly have limited applications?

What is the cost-benefit relationship, What is the cost-benefit relationshi...

What is the cost-benefit relationship regarding sewage treatment as a method to fight water pollution? To treat sewage is much cheaper for society. The non treated sewage pollu

Explain consultant dietitians, Explain Consultant dietitians Consultant...

Explain Consultant dietitians Consultant dietitians work under contract with healthcare facilities  or  in  their own private practice. They perform nutrition screenings  for

Write short note on cholesterol, Cholesterol, from stereos (solid) and the...

Cholesterol, from stereos (solid) and the Greek chole- (bile) followed by the chemical suffix -ol for an alcohol is an organic chemical substance classified as a waxy steroid of fa

Significant for chromosomes, Q. Why is it significant for chromosomes to be...

Q. Why is it significant for chromosomes to be condensed during mitosis and decondensed during interphase? During mitosis the major problem to be solved is the correct separati

Trypsin, Trypsin Trypsin is secreted by the pancreas in an inactive fo...

Trypsin Trypsin is secreted by the pancreas in an inactive form trypsinogen. It is activated by enterokinase secreted by the glands in the intestinal wall. As trypsin is forme

Animal and plant cells, Animal and Plant Cells The internal structural ...

Animal and Plant Cells The internal structural organisation and information related with hereditary characters and metabolic pathways are similar in all eucaryotic cells whethe

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