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

Composition of cell wall, COMPOSITION OF CELL WALL Cell wall composed ...

COMPOSITION OF CELL WALL Cell wall composed of cellulose, hemicellulose, pectin, lignin, cutin & chitin. Cell wall consists of 3 parts - 1. Matrix Highly cross-

Explain understanding the response of farmers, Explain Understanding the re...

Explain Understanding the response of farmers? Understanding the response of the farmers by the government also influences the food production. Government policy influences the

What are the male and the female gonads in humans, Q. What are gonads? What...

Q. What are gonads? What are the male and the female gonads in humans? Gonads are the organs that produce gametes they contain the germ cells that undergo division and generate

Why plant cycle know as alternation of generations, Q. Why is the plant lif...

Q. Why is the plant life cycle known as alternation of generations? The plant life cycle is called as alternation of generations because in this cycle there are two different f

Are the arterial pulsations normal, Are the arterial pulsations normal? ...

Are the arterial pulsations normal? Is the pulse volume normal or increased? Is there a discrepancy of pulsation in any of the four extremities? A careful evaluation of pulsati

Determine the mechanical properties of ti and ti alloy, Mechanical Properti...

Mechanical Properties of Ti and Ti Alloy as Compared to Bone  Titanium tends to seize when in sliding contact with itself or other metal. Titanium based alloys have a high co-e

Oncogene, Oncogene is the gene in a tumor virus or in the cancerous cells ...

Oncogene is the gene in a tumor virus or in the cancerous cells which, when transferred into the other cells, can cause the transformation (note which only certain cells are susce

Can you describe about hematosis, Q. What is hematosis? In humans where doe...

Q. What is hematosis? In humans where does hematosis occur? Hematosis is the oxygenation of the blood, venous blood (oxygen-poor) after hematosis is transformed into arterial b

Respiratory system, whats the difference in respiratory system in mammals,r...

whats the difference in respiratory system in mammals,reptilia and amphibian?

Sporotrichosis, Sporotrichosis Sporotrichosis is subacute or chronic i...

Sporotrichosis Sporotrichosis is subacute or chronic infectious disease caused by a dimorphic fungus, Sporothrix schenkii which occurs commonly in soil, wood and vegetation. T

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