What do you mean by echinodermata, Biology

Assignment Help:

Q. What do you mean by Echinodermata?

You will recall that Pliylum Echinodermata includes spiny skinned animals which are exclusively marine (Gr, echinus : spiny; derma: skin). They have the following characters which are not found in animals belonging to any other phylum:

i) Bilaterally symmetrical but radially symmetrical adults. Thus they exihibit secondarily pentamerous, radial symmetry found in adults.

ii) A skeleton made of calcareous plates or ossicles ,bearing projecting spines.

iii) Small pincer-like bodies present among plants called pedicellarise.

iv) Organs called "tube feet" or podia responsible for locomotion.

You shall be able to see the above-mentioned features when you handle echiinoderms.

Echinoderms also possess certain unique features which can be seen after dissecting

The animals. These features are:

(i) a system of coelomic channels forming a water vascular system with external tubular projections used in feeding and locomotion.

(ii) a blood lacunar system called the haemal system.


Related Discussions:- What do you mean by echinodermata

Explain about the acesulfame k - artificial sweeteners, Explain about the A...

Explain about the Acesulfame K - Artificial Sweeteners? Acesulfame-K (potassium salt of 6-methyl-1, 2, 3-oxathazin-4(3H)-one 2, 2 dioxide) is a sweetener which is commonly used

What are the major human diseases caused by virus, Q. What are the major hu...

Q. What are the major human diseases caused by virus? Among diseases caused by virus are common cold, variola (considered eradicated nowadays), mumps, measles, rubella, AIDS, t

Types of changes encountered during the support phase, What are the types o...

What are the types of changes encountered during the Support phase Adaptation - To accommodate changes to its environment Correction - To uncover defects in the Software

Colony collapse disorder in honey bees, Q. Colony collapse disorder in hone...

Q. Colony collapse disorder in honey bees? Honey bees (Apis mellifera) are social insects and live in colonies in hives. Honey bees were introduced from Europe to the USA to po

Define metabolic effects of thyroid hormones, Define Metabolic Effects of T...

Define Metabolic Effects of Thyroid Hormones? Although (T 4 ) is quantitatively predominant, (T 3 ) is the more active form. The mechanism of action of thyroid hormones appears

Protozoa, locomotion in protozoa

locomotion in protozoa

Define the uremia and nitrogen disposal, Define the Uremia and Nitrogen Dis...

Define the Uremia and Nitrogen Disposal? In animals, faecal and renal nitrogen were enhanced and decreased uremia was seen in normal and nephrectomised animals. The mechanisms

Derive gorlin formula, Q. Derive Gorlin Formula? Formula I: First Hydra...

Q. Derive Gorlin Formula? Formula I: First Hydraulic Formula (Toricelli's law) F = AVCc Where, F = flow rate A = orifice area Cc = coefficient of orifice cont

Planning for evaluation, PLANNING FOR EVALUATION: The need for clearly...

PLANNING FOR EVALUATION: The need for clearly defined objectives for the evaluation process, analysis of  the need for it, systematic measures for accomplishing its purpose an

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