Exterrral and internal environment, Biology

Assignment Help:

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.

 


Related Discussions:- Exterrral and internal environment

Male reproductive disorders-testicular hypoplasia, Testicular Hypoplasia ...

Testicular Hypoplasia Hypoplasia refers to testicular disorders related to congenitally underdeveloped and underactive spermatic epithelium of one or both testes even though t

Explain about the term accommodation, Explain about the term accommodation....

Explain about the term accommodation. Normally, the human eye focuses at objects at infinity, without exerting any power. This implies that while a person is observing an objec

What are the advantages of grains, What are the Advantages of Grains D...

What are the Advantages of Grains Diabetics should have more grains, beans and starchy vegetables every day. Whole-\ grain foods are nutritious and high in fiber, such as whol

Provide evidence to explain the conversion, Provide supporting evidence to ...

Provide supporting evidence to explain how conversion of a normal somatic cell into a malignant one requires multiple mutations.

Explain microbiology of fruits, Q. Explain Microbiology of fruits? Ans...

Q. Explain Microbiology of fruits? Ans. Fresh fruits, like vegetables, are in a close vicinity of ground and hence may have varied flora of microorganisms. Nature has

Define deuterostomes in animal kingdom, Define Deuterostomes in animal king...

Define Deuterostomes in animal kingdom? Coelomate animals are thought to have separated into two divergent lines of evolution in terms of the way embryos develop. In the embryo

Thyroid disorders, THYROI D DISORDERS - (A ) Hyperthyroidism (Hypers...

THYROI D DISORDERS - (A ) Hyperthyroidism (Hypersecretion of thyroid hormone). Graves' disease or Basedow's disease or Parry's disease or exophthalmic goitre . It is a

What is the radula, What is the radula? What is the function of this organ?...

What is the radula? What is the function of this organ? Some molluscs have a tongue-like structure with harsh saliences similar to small teeth. This structure is called radula

Fdas post marketing surveillance system works, Problem 1: How does the ...

Problem 1: How does the FDA's post marketing surveillance system works? Show FDA's post marketing surveillance system Explain about Adverse Event reporting system and

What is its function of cardia, Q. What is the route of the ingested food f...

Q. What is the route of the ingested food from swallowing until the duodenum? Until reaching the duodenum the food enters the mouth, passes the pharynx, passes the stomach and

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