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.
Describe about the Primary Prevention - Food Allergy? Let us further, dwell on measures we could adopt in primary, secondary and tertiary prevention. Current research in primar
Which is the type of gamete produced by a heterozygous individual? What is the genotypical proportion of these gametes? Heterozygous individuals, for instance, AA, produce two
Explain about the Adipose tissue - energy balance? At this point, it will not be irrelevant to consider how exactly an increase in the fat depot takes place. For understanding
how ova is produced
ATP-sensitive potassium channel? A. In smooth muscle cells surrounding an arteriole serving a region of the body that has just recently had very high levels of cellular acti
What is Ecology? The Ecology is the field of Biology that studies the relationship between living beings and between living beings and the environment.
Why d scientists pick hydrogen as the basis for MRI scanning? Name of the human body that do not appear in an MRI scan. Explain thermal stratification? How does thermal stratifi
Are the following statements true for eukaryotes , prokaryotes, both groups, or neither group? Answer They use a deoxyribonucleoside triphosphate as their energy currency"D They us
Is heart patient can do exercise Advise the patient to consult the doctor before starting any exercise. Doctor will advise the patient to choose exercises as per his condition;
Cells regulate their level of activity by regulating the amount of proteins present in the cell at any given time, so an up regulation of enzymes would be expected to A. increase t
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