Student of XII-Science (Chemistry)
Submitted to :
Lecturer in Chemistry
Sr. Sec. School
Ecosystem : It is an open system and depends upon solar energy from outside as its Energy source. An ecosystem can be temporary or permanent natural; Or artificial i.e. Man made all the ecosystems taken together in a given Geographical area having the same type of climate is called biome where As, all the biomes all the world taken together form and eatery and self Sustaining biotical system is called biosphere
Structure of Ecosystem: -
The entire ecosystem is made upon two main components biotic, biotic.
A) A Biotic components: - can be further divided into flowing their parts
Climatic factors: - these are two types i.e. Delphic, such as type graph
Inorganic substances: - These are various inorganic substances Like, carbon, nitrogen, sulphur, and carbon dioxide. Organic substances age carbon dioxide, proteins and lipids.
The biotic components of an ecosystem are a community of organisms, which is made up of many different inter-dependent population. The biotic community of an ecosystem includes three types of organisms- producers, consumers and Decomposers.
(a) Producers: Producers are the chlorophyll bearing organisms, Which can prepare their own food from simple inorganic Substances like carbon dioxide and water, in the presence Of sunlight.
(b) Consumer: they include heterotrophic organism, which depend on other organism or particular organic matter produced by producers. For example, grass also called primary consumers and break down the complex of dead protoplasm, absorb some of the decomposition products and release omprgamoc nutrients. Producers use these inorganic substances along- with other organic substances as energy sauce.
Major ecosystem: -
Natural ecological groupings of plants and animals Expend over large areas each of these major terrestrial ecosystem Distinctive terrestrial areas with their group of climax plants and Associated animals are recognized as biomes. A become is the Largest terrestrial community rainfall, temperature range nature of Soil, barriers latitude and attitude determine the nature and extend of bicomessimbirly there are distinct major ecosystem or life supporting zones are called biomes by in marine and fresh water environments.
Types of Ecosystem: -
1) Aquatic Ecosystem : There are many kinds of aquatic ecosystems that differ witty with Regard to almost all biotic factors. The communities living there obviously vary. The aquatic ecosystem range from ocean to small temporary paddies, have conditions of salinity, depth and fluctuations of temperature even the so called marine and fresh water environment have many ecosystems with overlapping boundaries which cannot by clearly distinguished.
2. Marine Ecosystem : The marine environments is characterized by its high concentration in The open sea is about 3.5 – the most dominations are sodium and Chloride followed by sculpture, magnesium and calcium. The salinity of the surface water and at various depths and latitudes varies single Environment. It’s subdivided into distinct ecosystems both in biotic and biotic consumption. The effects of geographical location and Rainfall are less mar keel on the cone then on the terrestrial biomes.
Function of Ecosystems
(a) Energy flow. The plants after trapping the solar energy, convert it into chemical energy. About 1 percent of total solar energy plants utilize reaching the earth during photosynthesis. The herbivores utilize 10 percent of the total energy fixed by the plants. The herbivores are energy received by herbivores.
The flow of energy is always unidirectional.
The following posing about the transfer of energy are not noteworthy:
1) Energy is neither created nor destroyed, but only converted from one form to another.
2) There is a continues transfer of energy from one tropic level the Next in the food chain. The energy available at each successive level is 10 percent of the pervious tropic level.
(b) Biogeochemical Cycles: -
The term “biogeochemical” tells us that biological, biological and chemical factors are involved. The cycles flow of nutrients between non–living environment and living organisms is known as Biogeochemical cycles there are four very important biogeochemical Cycles in nature.
These are carbon cycle, nitrogen cycle oxygen and water cycle.
The decomposers have an important role in the cycling of material In the biosphere. They act on the dead bodies of plants and animals And covert the complex organic compounds present in them into Into original nutrient elements, which go back into the nutrient pool. So, without decomposer, biogeochemical cycle by completed.
1) Carbon cycle: - carbon is after considered as the basis of life.
Carbon is most essential constituent of all major organic compounds of the protoplasm namely, the carbohydrates, proteins, fats and nuclides acids.
There are three main sources of carbon in the non – living words
1) The carbon dioxide of the air and that, which did, dissolved in water
2) The rocs in the earth gust can taint carbonates.
3) The fossil flues like coal and petroleum.
4) Carbon dioxide is the major source of for the living the carbon coal graphite. Petroleum, the insoluble carbonates and the like Are note available to the organisms bungs they are burnt or chemically charged. Most of carbon dioxide enters the living world Thought photosynthesis. The amount of carbon fixed by” is nearly 7x1013 per kg per year. The organic compounds synthesized in photosynthesis are passed from plants to the herbivorous and carnivorous animals sentiments suggest that one-hectare of a healthy freest will produce about to tones of carbon dioxide annually. During respiration plants and animals reties carbon back to the surroundings medium as carbon dioxide the dead bodies of plants and animals as wall as the body wastes that accumulates carbon organism to relapse carbon dioxide cabin also goes back for recycling during the burring of wood and fossil fools and by the carbonate roes and through conic activity.
2) Nitrogen cycle: - Nitrogen is and essential constituted of proteins and nuclear acids that Forms of the essential structural and functional components of a living Organism. Air is nitrogen yet elemental nitrogen cannot be used by Man, animals or higher plants. It has to be fixed’ , that is combined With other emends such hydrogen, carbon or oxygen before it can be Utilized some bacteria, living in the soil and water or in association With some plant roots, and some along have the ability to use gaseous Nitrogen there genre of bacteria normally rhyizobium azotobactor etc As well as cyan bacteria such as anabaena abusing. Plants uses nitrites The can also use ammonium to elaborate proteins.
Electrochemical and Photochemical fixation of nitrogen is only 35 mg. per m2 per year as Gamiest biological fixation which account fort 140 700 mg per The total amount of nitrogen fixed by nitrogen fixing microorganisms is about 175 million tones about 70% of our total supply the remaining amount Comes from chemical fertilizer factories. A part of the plant protein is consumed by animal and converted into Animal’s proteins while the rest is decomposed after the death and decay Of the plant body reason its nitrogen to the surrounding. In the animals Abode the proteins is eventually proven down into nitrogen wastes like Area uric aided and ammonia, and excreted.