Water relations in terrestrial environment, Biology

Assignment Help:

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.


Related Discussions:- Water relations in terrestrial environment

Ecosystem as a unit of nature , Ecosystem as a Unit of Nature An ...

Ecosystem as a Unit of Nature An ecosystem can be visualised as a functional unit of nature representing complex interactions between living and non-living components. Th

Nuclease, Nuclease  is an enzyme which degrades the nucleic acids. A nuclea...

Nuclease  is an enzyme which degrades the nucleic acids. A nuclease can be DNA-specific (a DNase), RNA-specific (RNase) or non-specific. It might act only on single stranded nuclei

Explain the term health, Explain the term 'health' Mention any two ways of ...

Explain the term 'health' Mention any two ways of maintaining it. Why does a doctor administer tetanus antitoxin and not a tetanus vaccine to a child Injured in a roadside acci

Grading of stenosis and grading of coronary artery disease, Q. Grading of S...

Q. Grading of Stenosis and Grading of Coronary Artery Disease? Multiple views are necessary to quantify coronary stenosis accurately. Further, there should be no foreshortening

Lipid case study, Beginning with the entry of fatty acid into target cells,...

Beginning with the entry of fatty acid into target cells, describe in detail how inactivation of carnitine can lead to a high level of fatty acids in the blood.

Skeletal muscle need an antagonistic partner, Why does each skeletal muscle...

Why does each skeletal muscle need an antagonistic partner? Because muscles can only contract and relax, each skeletal muscle requires an antagonistic partner to extend it afte

Sexual reproduction, SEXUA L REPRODUCTION 1 .       Amphigony       ...

SEXUA L REPRODUCTION 1 .       Amphigony        -          Zygote is formed. (i) Syngamy Fusion of gametes. (a) Endogamy - It involves self fertilisation. e.g.

Why does bark often die and break naturally, Why does bark often die and br...

Why does bark often die and break naturally? The bark is the mature periderm of the stem, branches and roots. It dies and breaks when these structures grow and thus the perider

Subcostal views, In addition to parasternal and apical transducer position....

In addition to parasternal and apical transducer position. Subcostal view also provides imaging window in adult patients. The patient is supine with knees flexed to relax the abd

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