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

Explain nicotinamide nucleotides, Nicotinamide nucleotides These coenzy...

Nicotinamide nucleotides These coenzymes are derived from  the vitamin, niacin. They are of two  types, nicotinamide  adenine dinucleotide (NAD')  and nicotinamide adenine dinu

Sericulture industry, in sericulture industry do which stages of silkworm w...

in sericulture industry do which stages of silkworm weaver buy? why do they do so?

Piciculture, PROJECTS THAT HAVE TO BE DONE IN SCHOOL ABOT PICICULTURE

PROJECTS THAT HAVE TO BE DONE IN SCHOOL ABOT PICICULTURE

Effects of insulin on carbohydrate metabolism, Insulin promotes muscle gluc...

Insulin promotes muscle glucose uptake and metabolism. In presence of insulin muscle cells take up glucose and use it as a source of energy. Insulin also promotes storage of insuli

Fertilization - development biology, Fertilization - Development Biology ...

Fertilization - Development Biology Previously you knew the process which leads to the differentiation of the male and female germ cells, the sperm and ova, respectively. In t

What is the difference among living and non-living things, What is the diff...

What is the difference among living and non-living things? Living things obtain and use energy. They also grow throughout their lifetime. Living this is made of cells. Living t

Simple febrile convulsions, Simple Febrile Convulsions These are convu...

Simple Febrile Convulsions These are convulsions associated with fever and infection, and is commonest causes of seizures during infancy and early childhood. These convulsio

Point and non-point sources, Point and Non-Point Sources The discharg...

Point and Non-Point Sources The discharge of effluents in receiving water body at a specific site are referred to a point sources in contrast to the inflow of pollutants in a

How can asexual reproduction in planarias be described, How can asexual rep...

How can asexual reproduction in planarias be described? Planarias can separate themselves asexually by transversal bipartition because of the great regeneration capability of 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