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

What percentage of the individuals are themselves dihybrid, In the offsprin...

In the offspring of a dihybrid self, what percentage of the individuals are themselves dihybrid?

Are nematodes triploblastic or diploblastic animals, Q. Are nematodes tripl...

Q. Are nematodes triploblastic or diploblastic animals? Just like platyhelminthes, nematodes are triploblastics that is they present three germ layers (ectoderm, endoderm and m

Studying a single rock, Studying a single rock Select a single rock and...

Studying a single rock Select a single rock and try to learn as more as possible about it from careful observation. If it is flat, it is probably a piece or layer from Sediment

Explain about mental foramen and nerve, Explain about Mental foramen and ne...

Explain about Mental foramen and nerve Mental foramen is a strategically important landmark during osteotomy procedures. Its location and the possibility that an anterior loop

Procedure of the second interphase period, Q. What are the events that mark...

Q. What are the events that mark the end and the beginning of the second interphase period and what happens in the cell in this period? The second interphase period is the S, i

The physical environment - stress of hospitalization, The Physical Environm...

The Physical Environment   The actual hospital environment is another factor that may be stressful for the child and family. There are many unfamiliar sights, sounds and smells

Explain about the physiological accommodation, Explain about the Physiologi...

Explain about the Physiological Accommodation Physiological Accommodation contractile power of the ciliary muscle required to change the focussing power of the eye by ID. Meas

What is the difference between osmosis and diffusion, What is the differenc...

What is the difference between osmosis and diffusion? Osmosis is the occurrence of movement of solvent particles (in general, water) from a region of lower solute concentration

Types of nursing units, TYPES OF NURSING UNITS: The design of nursing ...

TYPES OF NURSING UNITS: The design of nursing unit should maximize the function of the unit by following its task. The design of nursing unit has also under gone a radical cha

Body cavity and coelom - metazoa, Body Cavity and Coelom - Metazoa Vac...

Body Cavity and Coelom - Metazoa Vacuoles, spaces, lacunae and cavities have been of importance in all organisms, may it a be plant or animal. All animals have cavities. The c

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