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 hyperglycaemic, Hyperglycaemic:- In the fasting state, glucose ...

Hyperglycaemic:- In the fasting state, glucose release from the liver increases due to the action of glucagon and in the muscle by epinephrine. Glucagon  also  enhances glucone

Verify that the transforming agent in a bacteriophage, Which of the followi...

Which of the following experimental steps permitted Hershey and Chase to verify that the transforming agent in a bacteriophage is DNA as well? A. Phage particles were mixed wit

Make a sketch of a petroleum trap, Create a sketch of a petroleum trap. Wri...

Create a sketch of a petroleum trap. Write a history for how it came to the present (sketched) form following the rules of logical deduction.

Define physiology cohesion and adhesion theory, Define Physiology: Cohesion...

Define Physiology: Cohesion & Adhesion Theory? Transport in Plants :  Transport of water, minerals and nutrients within vascular plants is dramatically different from animals

Nutritional demands of sports and dietary recommendations, Define Nutrition...

Define Nutritional Demands of Sports and Dietary Recommendations? There is a strong relationship between nutritional status and physical training. Whether it is to maintain hea

Name the one autosomal dominant and autosomal, Name the one autosomal domin...

Name the one autosomal dominant and autosomal recessive Mendel an disorder in Humans. a) How is the action of exonucluease dissimilar from that of end nuclease? b) India has

Explain the liver biopsy assays, Explain the Liver Biopsy Assays? These...

Explain the Liver Biopsy Assays? These are used to measure the total vitamin A stores, as well us, the response in levels of vitamin A relative to different dosages of the vita

Determine the term - nitrogen, Determine the term - Nitrogen Most of n...

Determine the term - Nitrogen Most of nitrogen is available as organic nitrogen which has to be mineralised to inorganic form to become available to plants. Estimation of orga

Kingdom protista, what is the taxonomy of phylum sporoza?

what is the taxonomy of phylum sporoza?

Hormones of pancreas, HORMONE S OF PANCREAS AND THEIR ROLE - (i) Glu...

HORMONE S OF PANCREAS AND THEIR ROLE - (i) Glucagon (Secreted by a-cells) It stimulates the liver to convert stored glycogen into glucose. Glucagon is controlled b

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