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: A
Solution :
In frogs, the tongue can be thrown out and retracted suddenly to capture and engulf insects. According to Hartog, the throwing out of the tongue is brought about by the sudden flowing of squeezed lymph from the lymph sac to another due to muscular contractions but the swallowing is accomplished simply by raising the floor of the buccal cavity in which a flat hyoid cartilage is embedded.
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