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4 S.St. Chapter - 6 Waste Management

 Class 4     Subject  --S.St.
 Chapter - 6    Waste Management
  1.  Tick the correct option:
      1. Animals and plants waste can be converted into ----
             (a) Biogas
      2. It is the duty of _____  to keep our surroundings clean and green.
             (b ) Both
      3.  It is easy to recycle ------
  (a)  Plastic
      4.  Construction waste can be used for -----
  (a)  Filling  ditches
     B.    Fill in the blanks :
  1.  Human waste is open fields must be converted with soil in rural areas.
  2.  Recycling is beneficial for the environment.
  3.  Biodegradable waste can be used to make compost.
  4.  Waste disposal is important to keep our surroundings clean.
  5.  The four Rs to reduce waste are reduce, reuse, recycle and rethink.
     C.    Match the following:
  1.  Biodegradable waste         (b)  can be converted into harmless  substances.
  2.  Non biodegradable waste  (a)  cannot be easily converted into harmless substances.
  3.  All living beings                  (d)  produce waste
  4.  Recycling will benefit         (c)  animal and humans  both.
   D. Answer the following questions :
   Q 1. What is the waste ?  Name three diseases caused by waste materials thrown in open       
          areas.
   Ans.Damaged and useless materials those are thrown out from our homes and offices are 
          known as waste.
          Typhoid,  Cholera, Plaque are diseases caused by waste materials thrown in open areas.
   Q 2. Highlight two differences between biodegradable and nonbiodegradable waste.
   Ans.Biodegradable waste --- 
          (i)  Biodegradable waste can be converted into harmless substances.
          (ii) They can be used as manure. 
           Non - biodegradable waste --
          (i)  Non - Biodegradable waste cannot be changed into harmless substances.
          (ii) They are recyclable.
   Q 3. What are the benefits of recycling ?
   Ans. Recycling protects the environment and its benefit in the following ways : 
         (i) It reduces the amount of waste.
         (ii) It conserves our natural resources like timber, water, iron etc. 
         (iii) It reduces pollution.
         (iv) It saves energy . 
   Q 4. Mention any two methods of waste disposal. which one of the best in your opinion ? give     
          one reason.
   Ans. Landfills and recycling are two methods of waste disposal. recycling is the best in my
           opinion because it protects our environment.
   Q 5. Suggest two ways of reusing waste materials from our homes, schools and offices.
   Ans. (i) We can use the broken pots of our homes to fill the soil and grow the plants.
           (ii) We can use the the waste pencils and papers to decorate the display boards of our
               School.
   E. Complete the waste management puzzle with the help of clues given : 
  1. To use something again.                                     Ans.     Reuse
      3. To give away something to someone.                   Ans.      Donate
  1. Converting useless articles to a useful one.         Ans.      Recycle
      4. Something useless.                                              Ans.      Trash
      5. A bag can be used again.                                     Ans.      Cloth

      6. A ______  bucket can be recycled.    

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