This question was a popular question among the candidates and their performance
 was good.  In part (a)(i) candidates correctly identify the structure represented by the diagram, in (a)(ii) candidates  could not correctly name the parts labelled I,II,III,IV,V,VI,VII and VIII, they muddled up the answers  by mentioning wrong answers such as crown, secondary layer, muscle/nucleus, primary layer, dead cell, molar, they also mistook  answers for the labels.  In part (b) candidates correctly state function each of the parts labelled I and IV.  In part (c) candidates correctly name diseases that could affect the structure represented by the diagram.

         However, the expected answers were as follows:
        
3 (a) (i)  Identification structure represented by the diagram

• tooth/premolar/molar

    
       (ii)  Naming the parts labelled
  I           -           enamel
  II          -           dentine
  III         -           pulp cavity
  IV        -           cement
  V        -         alveolar membrane
           VI        -          root
           VII       -          neck
            VIII     -          crown
                                
 (b)  Function of the parts labelled I and IV
       Function I

•  It is for grinding, chewing and crushing
• Protecting the underlying structures

 
       Function IV

•  It holds or secures the tooth

(c)        Diseases that could affect the diagram
-           gingivitis/swollen/inflamed gum/loose of teeth
-           periodontitis
-          dental decay/ dental caries/tooth aches.