Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Class Polychaeta - Classification of Coelom
There are mainly marine forms with distinct head, having eyes and tentacles, segments have lateral projections of the body wall termed as parapodia which carry bundles of setae. These animals do not have clitellum. Sexes are separating (dioecious). They have no different or permanent sex organs, but their gonads consist of masses of developing gametes arising as swellings of Peritoneum. Eggs generally develop into trochophore larva. Many forms reproduce asexually by budding. ? Most of the polychaetes are 5-10 cm long. They live below rocks and in crevices, or burrow in mud. Some build tubes. Other is pelagic. These animals are generally divided into
(1) Errant forms on the one hand that are freely moving, pelagic, active burrowers, crawlers and the tube worms which leave their tubes for several purposes. On the other hand
(2) The sedentary forms do not leave their tubes or burrows but may generally expose just only their heads outside.
Errant polychaete structure may be considered classic of a generalised polychaete. The prostomium is very well developed, with several sense organs such as eyes, antennae, palps and the nuchal organs. Prostomium is dorsal and preoral projecting over the mouth. The peristomium that is the first segment carries the mouth. The predatory forms have jaws in the mouth. The peristomium is often fused along with one or more subsequent segments forming the head. These segments as well usually carry sensory structures, but their parapodium as well bears bundles of chitinous setae in the setal sacs. Nereis is a typical example. A cross section of its body by one of its middle segments shows well its internal organisation.
How are the change in the ageing lens occurred in the metabolism? Changes in the Ageing Lens 1) Physical changes: Lens weight increases, light transmission decreases, li
how is the anaerobic energy system not entirely anaerobic?
What do all organic compounds contain? The key element is carbon. Organic compounds are all carbon-having compounds. By definition, an organic compound having carbon. Alt
what are the characteristics of animal population
What are zymogen granules
what are the uses of computer in biotechnology ??? briefly explain any twenty
Q. What is the relationship between concentration gradient and passive and active transport? Passive transport is the movement of substances across membranes in favour of their
Q. Explain about eukaryotic organism or Fungi? Fungi are eukaryotic organisms. This means that their DNA-containing chromosomes are enclosed within a nucleus inside their cell
Besides the pancreatic juice in the intestine there is the releasing of the enteric juice that having digestive enzymes too. What are these enzymes and which type of molecule does
Define Burette - Nutritional Biochemistry A burette is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap,
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd