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

Complications of diverticular disease, Q. Complications of diverticular dis...

Q. Complications of diverticular disease? The many complications of the disease include the 'following conditions: • A perforation (hole) in the intestine leading to perito

Canine distemper, Canine distemper Canine distemper, a highly contagio...

Canine distemper Canine distemper, a highly contagious disease of dogs, is caused primarily by air- borne virus which belongs to the genus Morbillivirus in family Paramyxoviri

Bovine spongiform encephalopathy (bse), Normal 0 false fal...

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

Describe infectious agents, Describe Infectious Agents ? Recently there...

Describe Infectious Agents ? Recently there has been increasing interest in the relation between chronic low grade systemic inflammation and mortality of coronary artery diseas

What are the fundamental constituents of the cell membrane, Q. What are the...

Q. What are the fundamental constituents of the cell membrane? The cell membrane is formed of lipids, carbohydrates and proteins. The membrane lipids are phospholipids, a sp

Birth marks (naevi) and vascular naevi, Birth Marks  (Naevi): Birth Ma...

Birth Marks  (Naevi): Birth Marks  is also known  as naevi.  It  is a multiplication  of  one or more cutaneous elements within  the skin. It  is defined  as a  congenital, ci

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

Explain adverse effects of bronchospasm, Adverse Effects of Bronchospasm ...

Adverse Effects of Bronchospasm Nasal and throat discomfort can occur. Bronchospasm, sometimes severe, has been reported uncommonly in patients with reactive airway disease; za

Body composition assessment methods - underwater weighing, Define Body Comp...

Define Body Composition Assessment Methods - Underwater Weighing? Underwater weighing or hydrostatic weighing is one of the most common body composition methods used in laborat

POPULATION, WHAT ARE THE CHARACTERISTICS OF POPULATION IN ANIMAL

WHAT ARE THE CHARACTERISTICS OF POPULATION IN ANIMAL

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