Exterrral and internal environment, Biology

Exterrral and Internal Environment

Let us try to understand the concept of environment with some examples. Can you identify the environment of a single carp fish in the pond?

Its environment consists of abiotic components sych as light, temperature, water in which nutrients, oxygen, other gases and organic niatter are dissolved. The biotic environment consists of microscopic plankton as well as higher plants and animals and decomposers. The plants are of different kinds such as phytoplankton, partly submerged plants and plants and trees growing around the edge of the pond. The animals consist of zooplankton, insects, worms, molluscs, tadpoles, frogs, buds and various kind of fishes. The decomposers are the saprouophs.


The environment of the fish described above is its external environment. Living organisms also possess an internal environment, enclosed by the outer body surface. The body surface acts as an exchange banier between the ex'temal and the internal environment (Figure a & b show nbelow) and Ecosystem. In the case of unicellular organisms however, the boundary of the cell is also the boundary of the organism. The exchange of materials in single celled organisms is camed out directly with the external environment to which they are exposed.The internal environment is relatively stable as compared to the external environment. However, it is not absolutely constant. Injury, illness or excessive stress upsets the intemal environment. For example, if a marine fish is transferred to a fresh water environment, it will not be able to survive.


Posted Date: 12/10/2012 4:23:05 AM | Location : United States

Related Discussions:- Exterrral and internal environment, Assignment Help, Ask Question on Exterrral and internal environment, Get Answer, Expert's Help, Exterrral and internal environment Discussions

Write discussion on Exterrral and internal environment
Your posts are moderated
Related Questions
Q. Enumerate the advantages of implant supported prosthesis over a removable one Removable soft tissue-borne partial dentures have one of the lowest patient acceptance rates in

A person with a cough takes a patent cough syrup. In three days, the cough is better. Does this mean that the syrup has cured the cough?  Justify your answer. There is insuffic

Q. What is the life cycle of Plasmodium vivax? The vector mosquito bites a infected person and ingests female and male gametocytes of the parasite. Within the insect gut the ga

Isomerases These  enzymes (code  EC 5)  catalyze geometric  or  structural  changes  within  a molecule. According  to the  type of  isomerism,  they  may be  called  racemases

Q. Explain Spoilage by yeasts? Yeasts dominate in the spoilage of fruit products which contain high acid content due to their ability to tolerate high acid environment. Yeast

While explaining the concept of natural selection, we have stressed the fact that natural selection is synonymous with differential or non-random reproduction. Natural selection ai

Explain the Importance of Surgery? Well, surgery is that branch of medical science which has for its object the cure of local injuries or diseases, as wounds or fractures, trau

With response to synthesis of fatty acids and triacylglycerol, the pentose pathway supplies: -NADPH and glycerolaldehyde 3 P -NADPH and glucose -NADPH and ribulose 5 P

Necessity of Transport in Phloem Leaves produce photoassimilates and support various tissues including roots. The excess photoassimilates and metabolites stored in specialised

Nitrogen is very important constituents of all organisms life  because it forms the structural parth of proteins, nucleic acids and chlorophyll molecules.               Earth 's