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

Mycotoxicoses, Mycotoxicoses Mycotoxicoses cause heavy economic loss d...

Mycotoxicoses Mycotoxicoses cause heavy economic loss due to high morbidity and consequent production loss. Low grade mortality is also recorded. The main toxins involved are

Cells, Suppose you were planning to use liposomes in an attempt to deliver ...

Suppose you were planning to use liposomes in an attempt to deliver drugs to a particular type of cell in the body, for example, a fat or muscle cell. Is there any way you might be

Phylum platyhelminthes, PHYLUM  PLATYHELMINTHES Definition and Introd...

PHYLUM  PLATYHELMINTHES Definition and Introduction Bilateral and protostominal  organ  grade eumetazoans  without  a body cavity ( acoelomates)  platyhelminthes means fl

Effects of kwashiorkor on children, Effects of Kwashiorkor on children ...

Effects of Kwashiorkor on children Kwashiorker is an African word- it means displaced child. The child is weaned out very early and is given foods having high amounts of carboh

Explain procambium in primary growing shoot, Explain Procambium in primary ...

Explain Procambium in primary growth in shoot ? The vascular tissue in the shoot is produced from a primary tissue called the procambium, located in the apical meristem. New vas

What are some examples of organs and tissues, What are some examples of org...

What are some examples of organs and tissues where mitosis is more frequent, less frequent or practically absent? Generally in vertebrates mitosis is more frequent in a tissue

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

Explain an important strategy of group meetings, Explain An important strat...

Explain An important strategy of group meetings An important strategy could be to conduct small group meetings for behavioural change encouraging full participation. The group

Childhood obesity, Specify the things needed for a nurse-led primary health...

Specify the things needed for a nurse-led primary health care practice relating to childhood obesity. In particular, you need to do the following two things: (a) Indicate:

List out the principles of food preservation, List out the Principles of Fo...

List out the Principles of Food Preservation? All food preservation methods are based upon the general principle of preventing or retarding the causes of spoilage caused by mic

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