8th Class Science Sample Paper Science Sample Paper-2

  • question_answer  Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.                            


    Burning of wood has several disadvantages. These are as follows:
    (i) Burning of wood produces a lot of smoke which causes respiratory diseases.                                  
    (ii) The cutting down of trees to obtain wood fuel leads to deforestation which is very harmful to the environment                                                                                                                                   
    (iii) Trees provide us many useful substances. To obtain fuel wood, when trees are cut down, then all useful substances which can be obtained from trees are lost.         


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