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

Advantages of metagenesis in cnidaria, Advantages of Metagenesis in Cnidari...

Advantages of Metagenesis in Cnidaria In this you have studied that a huge number of Cnidarian colonies are polymorphic and exhibit alternation of generations. This changes o

Determine the fransworth 100 hue panel test, Determine the Fransworth 100 H...

Determine the Fransworth 100 Hue Panel Test This is a simple and useful test using colour chips arranged in a particular sequence. Colour deficient patients make errors in arra

Explain about the essential fat in humans, Explain about the essential fat ...

Explain about the essential fat in Humans? For the body to function normally, certain amount of body fat is required. This is called essential fat. For women, average amount of

Determine the types of plant sources - natural colourants, Determine the pa...

Determine the parts of plant source The natural food colourants from plant sources are classified into 5 types: a) Anthocyanins, b) Betalaines, c) Carotenoids, d) C

What are instances of nematodes, Q. What are instances of nematodes? As...

Q. What are instances of nematodes? Ascaris, filaria and hookworm, all parasites of humans, are instance of nematodes also known as roundworms. Q. Are nematodes exclusively

Proteins requirements for ulcerative colitis, Q. Proteins requirements for ...

Q. Proteins requirements for ulcerative colitis? Proteins: Patients with ulcerative colitis lose about 4-8 g fecal N2 as compared to the normal excretion of 2 g. In severe ulce

Functions of the bacterial flora within the human gut, Q. What are the majo...

Q. What are the major functions of the bacterial flora within the human gut? Bacteria that live inside the gut have great importance in digestion. Several polysaccharides like

What concentration of sucrose solution should administered, The volume of M...

The volume of Mrs. X's plasma was 3 liters before Ed administered the IV. Assume that there was a complete mixing of the administered water with her plasma but no mixing with her i

What is the external rigid carapace of arthropods called, Q What is the ext...

Q What is the external rigid carapace of arthropods called? Of which substance is it made? Which kind of organic molecule is that substance? The exterior carapace of arthropods

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