A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
Though, presence of teeth is one of the important features of mammal, there are many toothless mammals also. In spiny anteaters (Tachyglossus), no teeth are found at any stage, a secondary toothless condition occurs in some mammals. In platypus (Ornithorhynchus), embryonic teeth are replaced in adults by horny epidermis plates for crushing molluscs. The true or great anteater (Myrmecophaga) also has no teeth. In whale bone whales faetal teeth are replaced before or soon after birth by baleen plates for straining the planktonic food.
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