Which of the following teeth are absent in a rat?

Canines and molars

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Incisors and molars

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Incisors and premolars

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Canines and premolars

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Solution

The correct option is D Canines and premolars
Rats have incisors and molars. Incisors are the foremost teeth in mammals. In rats, there are four, long, sharp front teeth, two on top and two on the bottom. They are specialized for gnawing. Molars are rearmost teeth in the mouth of rat used for grinding food prior to swallowing it. Rats have 12 molars, six on top and six on the bottom. Rats do not have canines (the conical, pointed teeth used for holding prey, defense) or premolars (grinding teeth behind the canines and in front of the molars).
Thus, the correct answer is option D.

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Similar questions

Question 2
Which of the following pair of teeth differ in structure but are similar in function?

(a) Canines and incisors
(b) Molars and premolars
(c) Incisors and molars
(d) Premolars and canines

Q. Study the following passage:
Most of the vertebrates have jaws with teeth. The mode of arrangement of teeth on the jaws is called dentition.
The various types of teeth seen in mammals are incisors (I) canines (C) premolars (P) and molars (M). They are used for biting, tearing, chewing and grinding, respectively.
Canines, the tearing teeth are well-developed in carnivores and ill-developed or absent in herbivores.

Now answer the following:
(i) In frogs, all the teeth in the upper jaw look-alike, whereas in human beings they are different. The type of dentition in human beings can be called .........
(a) Homodont (b) Isodont (c) Heterodont (d) Acrodont
(ii) The dental formula of a mammal is written as ICPM=2023/1023. The teeth missing in it are ................
(a) Incisors (b) Canines (c) Premolars (d) Molars

Q. Premolars are absent in

Q. Premolar are absent in

Q. Animals in which premolars and molars are similar

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