What is class polychetae - marine worms, Biology

Assignment Help:

What is Class Polychetae - Marine Worms?

The polychaetes differ from the oligochaetes in several ways. The name itself suggests one of the differences. The prefix "poly" means "many," as opposed to "oligo," meaning "few." Thus, the polychaetes have many hair-like bristles. They also have paired appendages called parapodia that bear the numerous setae. Parapodia have several functions, including helping the worms swim or crawl, as well as providing an anchoring mechanism. Parapodia, in addition, provide increased surface area for gas exchange. Most polychaetes live in marine habitats, and they can be found either living as plankton, crawling on the sea floor, or living in tubes, which the worms secrete around themselves.

Polychaetes also differ from the other two groups in that their anterior is better developed. They have a definite head region with sensory apparatus that include light-sensitive eyes.

 

 


Related Discussions:- What is class polychetae - marine worms

Most important allosteric effector of glycolysis in liver, Name the most im...

Name the most important allosteric effector of glycolysis in the liver. Fructose-2,6-bisphosphate  is the most important allosteric effector of glycolysis  in the liver

Direction of flow, Direction of flow--either towards or away from the trans...

Direction of flow--either towards or away from the transducer (positive or negative Doppler shifts). Timing-instantaneous velocity and direction of flow throughout the various

Explain dual energy x-ray absorptiometry (dexa), Explain Dual Energy X-ray...

Explain Dual Energy X-ray Absorptiometry (DEXA)? Dual energy X-ray absorptiometry (DEXA) is a relatively new technology that is being identified as a reference method for bo

Tpes of diarrhoea, Tpes of Diarrhoea: Diarrhoea can be acute, chronicl...

Tpes of Diarrhoea: Diarrhoea can be acute, chroniclpersistent diarrhoea and dysentery.  If an episode of diarrhoea lasts less than 14 days, it is acute diarrhoea. Acute wat

Explain the completed test - most probable number test, Explain the Complet...

Explain the Completed Test - Most Probable Number Test? Coliform colonies on EMB or Endo agar are further examined by completed test by inoculating lactose broth and nutrient a

Illustrate the different types of drug receptor interactions, Problem 1: ...

Problem 1: Briefly describe the different types of parenteral routes of drug administration. Definition of parenteral routes of administration. Show different types of

What do you mean by tympanum, Q. What is the tympanum? In which part of the...

Q. What is the tympanum? In which part of the ear is it located and what is its function? The tympanum (or ear drum) is a membrane located in the middle ear just after the audi

What are immunoglobulins, What are immunoglobulins? Immunoglobulin is t...

What are immunoglobulins? Immunoglobulin is the exchange name given to antibody. Immunoglobulins are complex proteins having an invariable portion and a variable portion and ma

Mechanisms for response – protozoan, Mechanisms for Response – Protozoan ...

Mechanisms for Response – Protozoan Protozoa are sensitive to many kinds of stimuli like touch, temperature changes, light, chemicals, etc. It is not clear how they do so but

Categorisation of major brain functions, Categorisation of Major Brain Func...

Categorisation of Major Brain Functions As a framework, the major brain functions typically divided into modalities and domains. The major modalities are motor function and th

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