Maha bio

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Maha bio

  1. 1. OUR ENVIRONMENT&MANAGEMENT OFNATURAL RESOUCESMaha.
  2. 2. i) Biodegradable wastes :- are wastes which aredecomposed into harmless substances bymicroorganisms. Eg :-vegetables, fruits, pulses, cereals, cotton, jute, wool,wood, leather, paper, animal dung, animal bones etc.ii) Non biodegradable wastes :- are wastes which arenotdecomposed by microorganisms. Eg :- polythene bags, plastics, syntheticfibres, glass,metals, synthetic rubber, insecticides, pesticides etc.
  3. 3. Ecosystem :- An ecosystem consists of all the living organisms in an area along with the non living components and their interaction. There are different types of ecosystems. They are :- i) Natural ecosystems :- like forests, deserts, grass lands, mountains, ponds, lakes, rivers, oceans etc.ii) Artificial ecosystems :- like gardens, parks, crop fields, aquarium, zooetc.Components of an ecosystem :- An ecosystem consists of two main components. They are biotic andabiotic components. i) Biotic components :- are the living components like plants, animalsand microorganisms. They consist of producers, consumers and decomposers. Producers :- are green plants which produce food by photosynthesis. Consumers :- are herbivores which get their food directly from plants, carnivores which get their food indirectly from plants and omnivoreswhich get their food directly or indirectly from plants. Decomposers :- are microorganisms which decompose dead plants and animals. They decompose complex organic substances into simpleinorganic substances in the soil which are again used by plants.ii) Abiotic components :- are the non living components likeair, water, soil, minerals, sunlight , temperature, wind etc.
  4. 4. FOOD CHAIN:-A food chain is the flow of food energy from one organism to thenext and to the next and so on. They usually start with a producer(plants) and end with a carnivore. In a food chain an organism getsfood from one group of organisms.
  5. 5. FOOD WEB:-Food web is a group of several interconnected food chains.In a food web an organism gets food from more than onegroup of organisms.
  6. 6. Human activities affect the environment :-Depletion of ozone layer in the atmosphereManaging garbage we produceSeawage treatment
  7. 7. Land fills RecyclingProduction of biogas and manure Preparation of compost
  8. 8. Sewage treatment
  9. 9. Natural resources:-Natural resources are the resources available in a nature likeair, water, sunlight, soil, minerals, forests, wild life etc. Natural resources are of two main types. They are renewable and nonrenewable natural resources. i) Renewable natural resources :- Are the resources which can be replenished in a short period of timelike air, water, sunlight, forests etc.ii) Non renewable natural resources :- Are the resources which cannot be replenished in a short period oftime like minerals (coal, petroleum, natural gas, metals etc.) becausethey take millions of years to be formed. Human activities produce a lot of waste materials which are thrownaway into the environment. These wastes cause pollution of naturalresources like air, water and soil.
  10. 10. NATURAL RESOURCES
  11. 11. The Three R’s to save the environment
  12. 12. WE ARE GOING TO KNOW ABOUT:NEED FOR MANAGEMENTING NATURALRESOURCESIMPORTANCE OF FORESTSCONSERVATION OF FORESTSUSES OF WATERADVATAGES &DISADVANTAGES OF DAMSIMPORTANCE OF WILDLIFECONSERVATION OF WILDLIFECOAL AND PETROLEUMACID RAIN FORMATION

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