Observation

This question was attempted by many candidates and their performance was poor.  In part (a)(i) candidates could not correctly identify the diagram as roundworm, they identified it as tapeworm and in (a)(ii) they also could not state the shape of the worm illustrated, in (a) (iii) candidates also wrongly the part of the human body in which the roundworm lines as stomach instead of intestine  or small intestine, in (a) (iv) few candidates mentioned organisms in which the worm illustrated can be found and in (a)(v)

many candidates could not correctly mention the mode of feeding of the roundworm.  In part (b) (i) candidates could not correctly mention the sources of infestation of the roundworm and in (b)(ii) candidates correctly named other worms that infest humans.  In part (c) majority of the candidates correctly stated methods of preventing the roundworm.

The expected answers are as follows:

2 (a)(i) IDENTIFICATION OF WORM ILLUSRTATED IN THE DIAGRAM
-         roundworm/ascaris                                                    
       (ii) SHAPE OF THE WORM ILLUSTRATED
-         cylindrical                                                                                             
(iii)  PART OF THE HUMAN BODY IN WHICH THE WORM LIVES
-       intestine/small intestine                                                                                       
(iv)   ORGANISMS IN WHICH THE WORM ILLUSTRATED CAN BE
              FOUND

               -     fish
-     dog
-     goat
-     sheep
-     cattle
-     human
 
(v)    MODE OF FEEDING BY THE WORM ILLUSTRATED
-           parasitic/by sucking                             
(b)(i)   SOURCES OF INFECTION OF THE WORM ILLUSTRATED

• Contaminated food/vegetables/fruits
• Contaminated water  

     (ii)  OTHER WORMS THAT INFEST HUMANS
-   hookworm
-   guinea worm
-   flatworm/tapeworm/schistosoma
-   filarial worm
-   threadworm/pinworm

                                                                          

(c)       METHODS OF PREVENTING THE WORM ILLUSTARATED
-            good personal hygiene
-           eat balanced diet
-           practice environmental sanitation
-           clean water should be consumed
-           cook food properly
-           wash vegetables and fruits before eating