waecE-LEARNING
Home
Technical
Mathematics
Languages
Science
Social Science
Art
Literature Arabic Islamic Studies C.R.K MusicVisual Art Clothing/Textile House Management Shorthand
 
Biology Paper 2, Nov/Dec 2009  
Questions:   1 2 3 4 5 6 7 8   Main
General Comments
Weakness/Remedies
Strength












Question 8

)    What is refuse?               ( 2 marks)

(b)    Briefly explain four methods of refuse disposal      ( 4 marks)

 

(c)     State:   (i)     one advantage;
                      (ii)     one disadvantage of each method named in 8(b)                      (8 marks)

(d)     State six functions of the Red Cross Society.                      ( 6 marks)

_____________________________________________________________________________________________________
OBSERVATION

Even though more candidates attempted this question their scores were generally poorer in this number.  Most of the candidates could define refuse and explain four methods of refuse disposal but few of them could state one advantage and one disadvantage of each method named.  Only in the case of incineration/burning, most of the candidates could state that pollution was a disadvantage but none of them could state the advantages.

 

 

Expected answers include:

S/N

METHOD

ADVANTAGES

DISADVANTAGES

  1

Dust bins

 

-    Cheap
-     Portable

-     Easy to use

 Cannot contain much  refuse;
Has to be emptied regularly;
Attracts pests/rodents/house flies
Mosquitoes.

2.

Pits

-   Easy to use;

-   Accommodates large
    amounts of waste;

-    Occupies land space;

-     Attracts flies and
      rodents/breeding ground
      for pathogens;

-     Emits offensive odours;

-     May contaminate
      surface water.

 

 

 

 3.

Burning/incineration

-   Most hygienic  
     method of refuse  
     disposal;

-    Reduces the volume
      of refuse.

-   Expensive to build and 
    operate;
-   Emits offensive odour;

-   Source of air pollution.

 

4.

Composting

-    Organic Refuse is
      quickly broken 
      down/decomposed;

-      Nutrients are 
       returned to the  soil;

-     Source of manure.

 

 -    Inorganic refuse is not
     easily broken 
     down/decomposed;

 

-    Requires land space;

 

-    Manual labour is
      involved;

 

5.

 

 

 

 

 

Land-fill

-  To reclaim land;

     Checks soil erosion;

    Organic refuse quickly
     decomposes;

     Source of manure.

-    Leads to land/soil
     pollution;
-   Attracts flies/rodents;

-    Emits offensive odour;

-    May contaminate water
     bodies.

 

 

 

Most candidates who attempted the question could only state two functions of the Red Cross Society other answers are.

Functions of the Red Cross Society

-      provides care to accident victims;
-      distribute disaster relief items;
-      provides aid to soldiers/war victims;
-      provides community education on First Aid/HIV/AIDS;
-      organize safety drills in schools/workplaces;
-      provide care to motherless babies/establish  motherless babies homes/foster homes
-      Provides aids to veterans/ex-service men;
-      serves as a neutral intermediary during wars and conflicts.

Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2012 The West African Examinations Council. All rights reserved.