Polychaete, mollusca and echinodermata, Biology

Assignment Help:

Polychaete, Mollusca and Echinodermata

Polychaete and Mollusca

The polychaetes have a trochophore larva. A common trochophore larva is top shaped bearing a tuft of cilia at the apical end and a band or girdle of cilia termed as the prototroch which rings the body about one third to one half the distance from the apical tuft. It is the swimming organ and collects suspended food particles. The gut is a complete tube and mouth opens posterior to prototroch. Trochophore larva is characteristic of polychaetes and molluscs.

Echinodermata

Almost all larvae of echinoderms are planktonic. Not like the adults the larvae do not show pentamerous symmetry and do not have tube feet. They move by bands of cilia over the body and its projections. After a time of planktonic life a rudimentary skeleton starts to form and the larvae sink to the bottom to develop the adult shape and form.


Related Discussions:- Polychaete, mollusca and echinodermata

Artificial insemination, ARTIFICIAL INSEMINATION - Artificial insemi...

ARTIFICIAL INSEMINATION - Artificial insemination is a technique to make a female pregnant by artificially introducing semen into the vagina. Artificial insemination has

Explain asystole and pulseless electrical activity, Explain Asystole and Pu...

Explain Asystole and Pulseless Electrical Activity (PEA) The outcomes from these rhythms are generally much worse than for VT/VF, unless a readily correctable cause is identif

Determine the occurrence of biotin, Occurrence of Biotin Biotin occurs ...

Occurrence of Biotin Biotin occurs in nature very likely in all living cells, although usually in minute concentrations. In animal organs and in yeast, biotin is mainly cont

Define requirements of sodium during pregnancy period, Define requirements ...

Define requirements of Sodium during pregnancy period? As you know, sodium plays a role in fluid balance. Sodium metabolism is altered during pregnancy under the stimulus of a

Determine about the prokaryotes and eukaryote cell, Determine about the pr...

Determine about the prokaryotes and eukaryote cell The eukaryotic cells, on the other hand, have a true nucleus wherein the genetic material, DNA is enclosed within a well-def

Anatomy, what are the names of twelve cranial nerves

what are the names of twelve cranial nerves

Anatomy in relation to taxonomy, Q. Anatomy in relation to taxonomy? Th...

Q. Anatomy in relation to taxonomy? The use of anatomical* characters in taxonomy began with the development of the microscope which provided the biologist a new tool to observ

Summary of economic dimensions of financing healthcare, Normal 0 ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Define the spray drying method, Define the Spray Drying Method? Spray d...

Define the Spray Drying Method? Spray drying is a unique drying process since it involves both particle formation and drying. It is most suitable for drying of liquid foods suc

Which heavy metals cause toxic pollution, Besides mercury which other heavy...

Besides mercury which other heavy metals cause toxic pollution? Examples of other heavy metals that cause toxic pollution are lead, cadmium and chromium.

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