Page 1 - 2. Lesson noes-Ecosystem, Recycling of paper, Reforestation
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SAI International School
                                           Subject – Biology, Class-VIII
                                  Topic-Conservation of plants and animals
                              Sub topic- Ecosystem, Red data book, Migration,
                                        Recycling of paper, Reforestation
                                                       Module -34
                                                     Lesson Notes
               Ecosystem: It comprises of biotic components such as plants, animals, abiotic
               components like soil, water, air and climatic factors like temperature, humidity and wind.
               Each organism is important to maintain balance of nature .Examples- Forest, Sea, and
               Pond etc.

               Red data book: It is a source book which keeps record of endangered species of our
               country. It is separate for plants and animals. It provide information of endangered
               species of plants and animals and help us to conserve and protect them from extinction.


               Migration: The temporary and seasonal journey performed by complete population of a
               species for better climatic condition, breeding as well as in search of food is called
               migration. Birds like Siberian cranes comes to Odisha because their climate becomes
               inhospitable and harsh for getting food and breeding purposes. The birds perform
               migration every year in a specific season and go back to their mother land are called
               migratory birds

               Recycling of paper: Paper is manufactured from pulp of plants. Seventeen fully grown
               trees are used to make a ton of paper .Paper can be recycled from five to seven times
               .By saving ,reusing and recycling paper ,a lot of trees can be saved as well as
               deforestation can be reduced ..Recycling of requires energy and use of chemicals, so
               saving and reusing of paper is better than recycling of it.

               Reforestation: Planting same varieties of saplings in deforested areas which were
               existing earlier naturally in that area is called reforestation .It is important because the
               planted sapling can grow faster and better with minimum care as the climate as well as
               soil is suitable for them. If the deforested area is left undisturbed for some years,
               reforestation will take pace naturally without human efforts.
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