Explain cephalization in nematodes and platyhelminthes, Biology

Assignment Help:

How is the nervous system characterized in beings of the phylum Annelida? How can one compare cephalization in annelids to cephalization in nematodes and platyhelminthes?

Annelids have a nervous system made of two ventral chords and one relatively big nervous cell concentration in its anterior portion resembling a primitive brain.

Nematodes have an anterior neural ring connected to two neural chords, a ventral and a dorsal one, while in planarias (platyhelminthes) there are only two small anterior "cerebral" ganglia from which neural chords split. Cephalization in annelids thus is more outstanding than in nematodes or in flatworms.

 


Related Discussions:- Explain cephalization in nematodes and platyhelminthes

Define r and k strategists, Define r and K Strategists? Ecologists have...

Define r and K Strategists? Ecologists have identified two major types of reproductive strategies among species. Characteristic patterns can be seen among species relating the

Therophytes - classes of life form, Therophytes - Classes of Life Form ...

Therophytes - Classes of Life Form These are annual plants of the summer season or of the favourable season. They complete their life cycles in a single favourable season and

Explain the properties of good prebiotic, Explain the Properties of Good Pr...

Explain the Properties of Good Prebiotic? Thus, to summarize, we can say that a good prebiotic should have the following properties: Be active at a nutritionally feasibl

Define the types of canned foods, Define the Types of Canned Foods? 1....

Define the Types of Canned Foods? 1. Some foods form convection currents when being heated inside a can and so are heated faster since self-mixing - as foods become more visco

Name the primary and secondary minerals found in soils, Name the Primary an...

Name the Primary and secondary minerals found in soils Minerals such as silicate clays and iron oxide, which are formed by breakdown and weathering of less resistant materials,

Which groups does not contain a carbonyl, Which of the following functional...

Which of the following functional groups does NOT contain a carbonyl? Select one: a. Aldehyde b. Carboxyl c. Phosphate d. Amide e. Organic ester

Excretion, living organisms and their excretory products

living organisms and their excretory products

What is sanitation in food service establishments, Q. What is Sanitation in...

Q. What is Sanitation in food service establishments? We start our study of this topic by first defining what is sanitation? A three-word definition of food sanitation

Practical preparation - qualitative test for monosaccharides, Define Practi...

Define Practical Preparation - Qualitative Test for Monosaccharides? 1. Wear your labcoat. Make sure your hair is tied and you have no loose clothing. These can be dangerous in

Slight or no metamorphosis, Slight or no Metamorphosis In primitive w...

Slight or no Metamorphosis In primitive wingless insects (Apterygota) such as spring tails, silver fish etc. and in secondarily apterous insects the young ones which hatch fr

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