Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).
Assertion(A): The mammalian skull is termed dicondylic skull.
Reason (R): The mammalian skull has to occipital condyles that articulate with the axis vertebrae.
In the light of the given statements, choose the correct answer from the options given.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

Both (A) and (R) are false.

answer is C.

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Detailed Solution

The correct answer is (1) Both (A) and (R) are true and (R) is the correct explanation of (A).

Explanation:

(A) The mammalian skull is termed dicondylic skull. This statement is true. The term "dicondylic" refers to the fact that the occipital condyles of the mammalian skull articulate with two vertebrae, i.e., atlas and axis. This is in contrast to the monospondylic skull found in reptiles, where the occipital condyles articulate with a single vertebra, the atlas.

(R) The occipital condyles of mammalian skull articulate with two vertebrae, i.e., atlas and axis. This statement is also true. The occipital condyles are the two rounded knobs on the base of the skull that articulate with the first cervical vertebra, the atlas, and the second cervical vertebra, the axis. This arrangement allows for greater mobility of the head and neck.

Therefore, both (A) and (R) are true, and (R) is the correct explanation of (A). The mammalian skull is termed dicondylic because the occipital condyles articulate with two vertebrae, the atlas and axis.

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