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
Hypothalamus and Pituitary The most obvious neuroendocrine link is between the hypothalamus and pituitary. The hypothalamus is a part of the brain which is connected to the pi

Metabolism of Pollen Tubes Pollen grains contain auxins, and gibberellins which are known to be involved in post- pollination enlargement of the ovary and the development of


Q. What do you mean by Taxonomist? Modern classification systems are based on many types of evidence. A truly natural classification is obtained from analysis and harmonisation

Organizational assessments are vital to the introduction of Nurse Case Management (NCM) and Clinical Nurse Leaders (CNL)  ( I am in school for the CNL) Use the guidelines below

Q. Comparative picture of ecosystem? An ecosystem having higher diversity means the number of species and interactions between them which constitute the food web, is large. In

Dfine Integrated Child Development Services (ICDS)? The adolescent girl scheme under ICDS intends to cover school dropout girls, 11-18 years in age with a view to meet their ne

wt is an air bladder and its function wt is catadromous and anadromus migration

Explain the relationship between an agonist muscle and its antagonist as it relates to positional control, functional movement and neuromuscular activation. For example, how the th

Q. Concerning permeability what type of membrane is the cell membrane? The cell membrane is a selectively permeable membrane that is it allows the passage of water and some sel