Question

Teeth that are different in shape, size and function are called as
A. Acrodont
B. Pleurodont
C. Homodont
D. Heterodont

Answer 1

In animals, teeth are used for eating, chewing, tearing of food materials and it aids in the process of digestion. They are present in the lower and upper jaws and are made up of white portion that is known as enamel. It remains embedded in the soft tissues of the mouth which are known as gums.

Complete answer:
A tooth is a hard and calcified structure that is found in the two jaws or mouth in most of the vertebrates. The teeth are a set of teeth that are arranged in the lower as well as the upper jaws of the mouth cavity. The most important function of teeth is eating and consumption and tearing or chewing of the food. In some animals, teeth also act as a medium of defense and are also used for hunting.
Teeth are not bones but they are formed of multiple tissues that are calcified and are of different density and hardness. The teeth are embedded into the sockets and they consist of deep roots. In mammals, the portion of the tooth that is exposed is the enamel while the roots are present in the jaws. The different types of teeth present in an organism represents the diet and available food of the organism.
In vertebrates, different types of teeth are found which are differentiated into different forms. This condition where the organism contains more than a single tooth morphology. The different types of teeth are incisors, canines, premolars and molars which are found in the members of Synapsida. The different types of teeth are related to different degrees of feeding and hunting and tearing.
Homodont refers to a set of teeth in which all the teeth are of the same morphology. In the acrodont condition, the teeth are present at the summit of the alveolar ridge of the jaws and no sockets are present. These conditions of teeth produce a strong bite force.
Pleurodont teeth are attached on the inner side and upper side of the jawbone. It causes the jaws to bring a larger surface area of tooth in contact with the jawbone. It is found on the lizards and other Squamata.

Hence, the correct answer is option (D).

Note: Teeth are hard calcified structures and they are used for chewing, tearing, hunting of food. The teeth are dependent on the feeding habits of the organism. In animals that comprises different types of teeth that are different in sizes and function are known as heterodont teeth.