Water relations in terrestrial environment, Biology

Water Relations in Terrestrial Environment

Insects are the largest group of metazoans which have most successfully invaded the terrestrial environment. In addition, most arachnids, myriapods and isopod crustaceans do not depend upon the aquatic environment for their survival. Terrestrial anthropoids owe their success to life on land to the existence of an impermeable cuticle that prevents evaporation of water from the body. Their cuticle, a chitin-protein complex along with a hydrophobic wax layer on the surface is the water-proofing structure. The cuticle is an important structure which had made possible to a large extent the successful colonisation of land. Water loss through the spiracular openings is minimized by keeping the spiracles closed whenever the inspiration does not occur. The proximal region of Malpighian tubules and more importantly, the rectum play an important role in water resorption expelling only dry faecal pellets with insoluble uric acid as nitrogenous waste. Pulmonate molluscs that have taken to terrestrial habitat have a calcareous shell that avoids desiccation of the soft inner parts of the body. Physiological adaptations such as aestivation assist them to overcome adverse climatic conditions.

Posted Date: 2/4/2013 4:50:42 AM | Location : United States







Related Discussions:- Water relations in terrestrial environment, Assignment Help, Ask Question on Water relations in terrestrial environment, Get Answer, Expert's Help, Water relations in terrestrial environment Discussions

Write discussion on Water relations in terrestrial environment
Your posts are moderated
Related Questions
Explain the term - Social Attention and Environmental Influences The importance of social environment and early experiences in neurodevelopment is increasingly recognised. Due

Classifying Organisms You have now seen that the binomial nomenclature gives each species a unique and unambiguous name. It is necessary lo group species into genera and gener

Task: Write a maximum of five (5) pages of your research plan which should include details on the following topics as appropriate to your chosen study design: I. Background info

Nursing Process History Character of onset and duration of cough, sputum production, dyspnea, pain in right upper quarant.  Smoking history.  Past illness -

Explain Low birth weight infants (LBW)? One-third of the babies born in US are of low birth weight, less than 2.5 kg. A LBW infant has an inadequate mineralized skeleton, poorl

Vapour Pressure The intermolecular forces in a liquid prevent most molecules from escaping from the surface. However, due to molecular collisions, some molecules have sufficien

what is the effect of KClO4 on the kidneys in the nephrotic system?

Centimorgan (cM) is the unit of measure of a statistical probability recombination frequency between the alleles. One centimorgan is equal to the 1% chance that a marker at one ge


Why can the amnion also be considered an adaptation to terrestrial life? The amnion is also an adaptation to dry land since one of its functions is to prevent desiccation of th