waecE-LEARNING
Biology Paper 2,Nov/Dec 2011  
Questions:   1 2 3 4 5 6 7 8   Main
General Comments
Weakness/Remedies
Strength

















































Question 4

(a)   Explain the following terms:
        (i)  pollution;
        (ii)  overcrowding.                                                                                              [ 4 marks ]

(b)    List three pollutants each of
         (i)    water;
        (ii)    air.                                                                                                               [ 6 marks]

(c)  State five ways each of preventing:
       (i)   water pollution;

       (ii)   air pollution.                                                                                                 [8 marks ]
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comment

This was the less popular question this section.  Many candidates defined parasites, saprophytes and symbionts/the organism rather than parasitism, saprophytism and symbiosis/the mode of life and so lost marks.

Most candidates performed poorly in describing the features of a named ecto parasite.  Most candidates could however name the parasite e.g. tick, lice, flea but some candidates named tape worm which is an endo-parasite

Expected answers include:

External Features 

 -     Named ectoparasite (tick/lice/mite/flea)
               -    Dark; to hide in fur of host;
               -    Dorso-ventrally flattened to avoid falling off ;
               -    Biting/mouth parts; to attach to body of the host;
                -    Chitinous exoskeleton; to avoid drying up;
                -    Clawed digits for attachment

 

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