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Exterrral and Internal EnvironmentLet 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.
Explain Senning Procedure ? Operation is performed by ascending arteries and separate SVC and IVC cannulation. If the operation is done under deep hypothermic circulatory arres
what is heterotrophic nutrition ?
The common nitrogen-fixer in paddy fields is: 1. Rhizobium 2. Azospirillum 3. Oscillatoria 4. Frankia Azospirillum is the common nitrogen-fixer in paddy fields
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Let us learn about the factors that affect metabolism: 1) More energy is required when muscular work is carried out. 2) The larger the surface area of the body, more heat is
Acute Myocardial Infarction : Patients with acute non-Q myocardial infarction may need urgent intervention as indicated for cases of unstable angina.
Metaphase This is a period of short duration, the chromosomes are at the stage of their maximum condensation and , hence more clearly visible ,Upon each side of the
Basic characters of vertebrate classes
How has the importance of the brain evolved from fishes to reptiles? From the least to the most difficult brain structure, it is evident that the brain, from fishes to beings o
Identical Twins Human twins may be similar, when they are formed from one egg (monozygotic) or fraternal while they are the result of fertilization of two different ova releas
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