iGCSE Biology (0610)-7.3 Physical digestion – iGCSE Style Questions Paper 3

Question

Fig. 6.1 shows a section through a tooth.

(a)     State the names of structures F, G and H.

Write your answers on Fig. 6.1.

(b)     (i)   State two functions of teeth.

(ii)  Describe the importance of teeth in the digestion of food.

Answer/Explanation

Ans:

(a)     F: enamel ;

G: dentine ;

H: (named) blood vessel / nerve / pulp (cavity) ;

(b)     (i)      bite / tear / cut / hold / rip ;

chewing / grinding / crushing / producing small(er) pieces /mechanical digestion ;

increases surface area (of food) ;

killing prey / defence / cleaning fur ;

(ii)    produces small pieces of food ;

increases surface area ;

easier to swallow food ;

 

Question

(a) Teeth are involved in mechanical digestion.
What is meant by the term mechanical digestion?
…………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………. [2]
(b) Fig. 7.1 shows a section through a molar tooth.

(i) On Fig. 7.1, label parts Q and R. [2]
(ii) State two reasons why this tooth cannot be a canine tooth.

1 ………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………….
2 ………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………….
[2]
(iii) Gum disease causes the gums to shrink from position T to position S, as shown on

Fig. 7.1.

Suggest why the tooth is more likely to decay when the gums are at position S.
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
…………………………………………………………………………………………………………………….. [2]

(iv) State two ways of maintaining healthy teeth.

1 ………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………….
2 ………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………….

Answer/Explanation

Ans:

Scroll to Top