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By SAKSENA D.N. ET.AL

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QUESTIONS 1. 2. 3. 4. 5. Give an account of pond ecosystem. Describe universal model of energy flow. Define food chains and explain them in detail. Give an account of ecological pyramids. Write short notes on: A. Biosphere 51 Biosphere B. C. D. E. F. Food web V-shaped energy flow model Ecological pyramids Components of ecosystems Food chains BIOGEOCHEMICAL CYCLES Life on the earth is inextricably linked with climate through a variety of interacting cycles and feedback loops. , deforestation and fossile fuels burning, which directly or indirectly modified the biogeochemical and physical processes involved in determining the earth's climate.

Thus, in marine ecosystem, the grazing food chain is the major pathway of energy flow, whereas, in the forest ecosystem, the detritus food chain is more important. The Y-shaped model further indicates that the two food chains are in fact, under natural condition, not completely isolated from one another. For instance, dead Herbivores Plants Grazing food chain Sunlight Detritus food chain Fig. 11: V-shaped energy flow model 48 Environmental Biology bodies of small animals incorporated in the detritus food chain as do the faeces of grazing food chain animals.

Fertility: Soil contains bacteria including organoleptic bacteria, nitrifying bacteria, pigmented microbes, nitrogen fixing organisms and a number of fungi and protozoans. Activity of these microbes keep the soil in a fertile state. Waste materials or Environment 27 pollutants discarded in the soil are also effectively decomposed by these microbial organisms. Thus, the soil has great importance to our biosphere. QUESTIONS 1. 2. 3. 4. 5. 6. 7. Explain the abiotic and biotic factors of the environment.

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