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

What is a population, Q. What is a population? In the Biology a populat...

Q. What is a population? In the Biology a population is a set of individuals of the same species living in a given place and in a given time.

Surrogacy, what is surrogate motherhood

what is surrogate motherhood

What are the typical features of mammals, Q What are the typical features o...

Q What are the typical features of mammals? The typical features of mammals are: body (less or more) covered with hair; presence of the diaphragm muscle that separates the thor

Use of beta-blockers-peri operative problems, Use of Beta-blockers :  ...

Use of Beta-blockers :  In some centres, patients are routinely put on beta-blockers after CABG. European coronary artery surgery study showed that only 25 per cent of patient

Name the methods for extracting phosphorous, Name the methods for extractin...

Name the methods for extracting phosphorous Phosphorus/phosphate - Phosphorous is estimated as phosphate. Some methods for extracting phosphorous are as follows:   Dyer met

Interact with parent and child to exchange information , Interact with the ...

Interact with the Parent and Child to Exchange Information   At this time the nurse can learn why the child has come to the hospital and the concerns and expectations he and hi

Which type of cell came first in evolution, Q. Which type of cell came firs...

Q. Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell? This is an interesting problem of biological evolution. The majorly accepted hypoth

Triple vessel disease , Triple Vessel Disease (TVD) :  Patients with tripl...

Triple Vessel Disease (TVD) :  Patients with triple vessel disease and impaired left ventricular function do badly on medical treatment. They are candidates for CABG. Operation is

What are cytoplasmic inclusions, Cytoplasmic inclusions are cytoplasmic mol...

Cytoplasmic inclusions are cytoplasmic molecular aggregates, like as pigments, organic polymers and crystals. They are not considered cell organelles. Fat drops and glycogen gra

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