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!
Types specimens of echpnodermata Before we begin the study of the selected specimens of the following echinoderms - Feather star, Brittle star, Sea urchin, Sea cucumber and Star fish. You should be aware that though members of the various classes of ecchinoderms often appear to be superficially different, however their structure is fundamentally similar. For example sea cucumbers tack the five arms of sea stars, but they do have five bands of tube feet and thus show the same basic pentaradiate symmetry.Antedon is commonly called "feather star" or "sea lily" Examine the specimen and note the following features:
(i)The body of Antendon is made of a central convex disc of calyx and five equidistant, elongated slender radiating arms.
(ii)Each arm is divided into two branches at the base, so there are in effect ten long arms.(iii)The arms are slender, flexible, movable and bear small spine-like structures or pinnules on the two sides.(iv)The body has a distinct upper oral and lower aboral surface.(v)Aboral surface bears several root-like, slender, curved, jointed cirri supported by small ossicles which help to attach Antedon to rocks.(vi)Oral surface is covered with a soft and leathery skin, called tegmen and this surface bears the mouth and anus on the same side of the calyx. The anus is borne on a tiny papilla and is excentric whereas the mouth is in the center. (vii)Five ambulacral ciliated grooves radiate from the mouth towards the arms. Each groove divides into two and runs along the oral surface of each arm.(viii)The intervening body surface is the adambulacra.(ix)Tube feet or podia are without suckers and can be seen along the edges of ambulacral groove.(x)The exoskeleton is made of calcareous ossicles or plates.
What is Concentration Gradient? The graduated dissimilarity in concentration of a solute per unit - distance by a solution.
Benefits of Cross-Pollination Because of the specific benefits of cross-pollination, flowering plants have evolved many devices to prevent self-pollination and to encourage cr
Define Sugar as a type of Carbohydrates? This group includes monosaccharide and disaccharides. List down the names of sugars under both these groups and check it out with those
what is saprophytic
What are the plant tissues that constitute the functional structures of the leaf veins? Leaf veins are made of vascular tissues. They are constitute by xylem and phloem that re
Collection of Blood It is a procedure done routinely for diagnosis. It can be done in various ways. 1) Capillary Sampling The heel is the most useful area i
Define the Food Processing? We are all aware that delay in the use of fresh foods, alters its freshness, palatability and nutritive value. Therefore, it becomes very important
Why are vaccines made of the own disease agent or of fragments of it? The goal of vaccines is to artificially persuade a specific primary immune response (and the consequent fo
describe the importance,principles,techniques and uses of microscopy
Define Criteria for Assessment of Vitamin K Status? The parameters of blood clotting time and prothrombin time are used as criteria to assess vitamin K status as this vitamin
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