NEET 2011 Biology question
Consider the following four statements (A-D) related to the common frog Rana tigrina, and select the correct option stating which ones are true (T) and which ones are false (F) Statements : (A) On dry land it would die due to lack of O its mouth is forcibly kept closed for a few days (B) It has four-chambered heart (C) On dry land it turns uricotelic from ureotelic (D) Its life-history is carried out in pond water Options : (A) (B) (C) (D)
Solution
(A) True: the frog needs both cutaneous (moist skin) and buccal/pulmonary respiration; if its mouth is forcibly kept closed (and on dry land the skin dries, stopping cutaneous respiration) it dies of oxygen lack. (B) False: the frog has a three-chambered heart (two atria and one ventricle); a four-chambered heart is
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