Foot as burrowing organ, Biology

Assignment Help:

Foot as Burrowing Organ

The Scaphopoda that usually have burrowing habit, possess foot suitably modified for burrowing purpose. The conical and protrusible foot of Dentalium is trilobed at its distal end. It can be thrust into the sand while burrowing occurs. A lobe encircling the cone can be erected to increase its anchorage. In between burrowing bivalves, in some like Pholas which bores into rock the blunt, short foot is employed for boring. They attach by the sucker-like surface of the foot; the muscles of the foot produce several movements producing the requisite cutting force; the anterior ends of the valves give the sharp cutting edge. The shipworm Teredo bores into wood using more or less similar mechanism. In Yoldia, the two sides of the foot can be folded to make a wedge shape for easy burrowing into the sand or mud. In some burrowing gastropods, for example Sigaretus , the anterior part of the foot, called protopodium, is as well specialized to become wedge like. The burrowing action in molluscs is typically accomplished through thrusting the blade of the foot into the sand or mud. The distal part of the foot is dilated along with the aid of protractor muscles and when this is accompanied by blood pressure it acts like an anchor. Contraction of the retractor muscles now pulls the animal downward.


Related Discussions:- Foot as burrowing organ

Explain the meaning of a repression lag, Which of the following most accura...

Which of the following most accurately explains the meaning of a repression lag? A. A repression lag refers to the time that it takes for the last full-length mRNA transcript t

Reproduction, what are the methods of seed formation

what are the methods of seed formation

Nutritional management for lactose intolerance, Q. Nutritional Management f...

Q. Nutritional Management for lactose intolerance? Diagnostic tests are available that can give information about the level and activity of the lactase enzyme. Depending on the

Predict the genotypes and phenotypes of the f2, In rats, the gene pigment (...

In rats, the gene pigment (P) is dominant to no pigment (p). The gene for black (B) is dominant to the gene for cream (b). If a pigment gene (P) is absent, genes B and b are inoper

Sweating - temperature relations in animals, Normal 0 false f...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Evolution of human kind, The evolution of human kind can be regarded as the...

The evolution of human kind can be regarded as the climax of phylogenic history of organisms. In the previous units of this block as well as the previous block we have detailed for

Illustrate the plant taxonomy, Q. Illustrate the Plant taxonomy? Plant ...

Q. Illustrate the Plant taxonomy? Plant taxonomy has a long history. It gave birth to several phases of botany but remains exciting, interesting and important because there is

How much physical activity is enough, How much physical activity is enough?...

How much physical activity is enough? Although it is difficult to prescribe the optimum amount of physical activity, it is important to note that any exercise programme has to

Explain ribavirin, Ribavirin (Copegus, Rebetol, and others)  Combinatio...

Ribavirin (Copegus, Rebetol, and others)  Combination treatment of HCV with peginterferon alfa and oral ribavirin has produced higher sustained response rates than peginterfero

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