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.

272_environment.jpg


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
Derived Proteins These are not naturally occurring proteins and are obtained from simple proteins by the action of enzymes and chemical agents, heat, mechanical shaking, UV or

Q. What is Juvenile Mitral Stenosis ? Peculiar to developing countries is the problem of juvenile mitral stenosis. Patients with rheumatic fever develop tight mitral stenosis i

How does light intensity affect oxygen production?

what are the examples of sex-influenced traits in human?

What are Proteins and Why they are important for us? We just read that proteins are essential for maintaining and sustaining life. What are proteins or what constitutes protein

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Define Deficiency and Toxicity of Vitamin D? Infants constitute a population at-risk for vitamin D deficiency because of relatively large vitamin D needs brought about by their

Q. How do contraceptive pills generally work? Contraceptive pills generally contain the hormones progesterone and estrogen. If taken daily from the 4th day after menses the abn

There are different types of insulin available and prescribed by the doctor according to the need of the patient. Insulin is grouped according to the speed of action in the body i.

Ion channel-linked receptors will transmitter-gated ion channels or ionotrophic receptors that   are included in the rapid synaptic signaling among electrically excitable cells. No