What we have learned earlier

1. Unless the natural resources are properly protected and maintained the equilibrium of the nature will be affected adversely.

2. Each species has its own adaptations in relation to its ecosystem.

3. The extensive utilization of fuels, including fossil fuels is becoming harmful to the living world.

4. Over population leads to environmental pollution and it also affects ecological balance.

5. Air pollution and water pollution cause different kinds of ailments.

6. Different living beings in an ecosystem exist through food relations of commensalisms, symbiosis and parasitism.

7. Biosphere is formed of various ecosystems of different trophic levels.

8. It is possible to schematise diagrammatically the interrelationships between different trophic levels of a food chain.

9. Carbohydrates and lipids are formed of carbon, hydrogen and oxygen, while protein is composed of carbon, hydrogen, oxygen and nitrogen.

BIOLOGY

Even though there is diversity among the living organisms in the biosphere, their bodies are made up of same kinds of elements. Their cells, tissues and organs all have same type of materials. The body components of a living being become the food of another organism. Food being the chief source of energy, it is clear that along with food components, energy is also transferred through the food chains. This process should be regularly carried out for the proper maintenance of environmental equilibrium. But the indiscriminate invasion of the ecosystem by man has always adversely affected the natural environment.

Let us first consider the flow of materials and energy through the food chains as the prime characteristic of the biosphere. This will help us to know the significance of the need for conservation of nature and natural resources.

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Indirect speech: commands, requests, advice	\|	The Biosphere

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