OBJECTIVES
The diagrams below are illustrations of the dentition of an organism. Study them and answer questions 1 to 3.
1. The dentition belongs to
A. rabbit.
B. cat.
C. Frog.
D. man.
2. The function of the teeth labeled X is for
A. biting and grasping.
B. chewing and grinding.
C. tearing and grasping.
D. chewing and tearing.
3. The teeth which are absent in the young of the organism are labelled
A. W.
B. X.
C. Y.
D. Z.
4. An herbivore cannot feed on a piece of meat because it has no
A. incisors to cut the meat.
B. canines to tear up the meat.
C. premolars to grind the meat.
D. molars to mash the meat.
Which of the following dental formulae represents the dentition in rabbits?
A. I 2/2 C 0/0 P 3/2 M 3/3
B. I 2/2 C 2/2 P 3/2 M 3/3
C. I 2/2 C 0/0 P 2/3 M 3/3
D. I 2/1 C 0/0 P 3/2 M 3/3
6. Which of the following parts of the tooth is first damaged during dental decay?
A. Cement.
B. Enamel
C. Dentine.
D. Root.
7. Which of the following teeth are well-developed to form the carnassial teeth of carnivorous mammals? The
A. firsts lower premolar and third upper molar.
B. first lower molar and third upper premolar.
C. second lower premolar and first lower molar.
D. first lower molar and last upper premolar.
8. Which of the following organisms has homodont dentition?
A. Rabbit.
B. Man.
C. Sheep.
D. Lizard.
9. The teeth used for tearing and cutting are
A. canine and molars.
B. premolar and incisors.
C. molar and incisors.
D. canine and incissors.
10. The dentition of a herbivore is distinct from that of other animals due to the presence of
A. diastema.
B. cusps on molar teeth.
C. canines.
D. ridges on molar teeth.
11. Tooth decay is usually caused by
A. undigested and absorbed food.
B. eating limited amount of sweetened food.
C. the bacteria in the mouth that metabolize sugar to acids.
D. eating a lot of proteinous foods.
THEORY
1. Explain briefly how the dentition of herbivores is adapted for feeding.
2. What is dentition in animals? Describe briefly the generalized structure of a tooth in animals.
3. State: (i) three differences between the dentition of a herbivore and a carnivore; (ii) four differences between the dentition of a human and a goat. (c) What are milk teeth?