Biology · STRUCTURAL ORGANISATION IN ANIMALS

Review the anatomical features of Rana tigrina: (i) Circulation type, (ii) Nature of RBCs, and (iii) Tongue morphology. Which option correctly details all three?

(i) Incomplete open system, (ii) Erythrocytes devoid of pigment, (iii) Non-muscular tongue.
(i) Open vascular system with hemocoel, (ii) Enucleated erythrocytes, (iii) Unilobed fixed tongue.
(i) Closed vascular system, (ii) Enucleated erythrocytes, (iii) Bifid tongue attached posteriorly.
(i) Closed vascular system, (ii) Nucleated erythrocytes with haemoglobin, (iii) Bilobed tongue attached at anterior end.

Correct answer · Option 4

(i) Closed vascular system, (ii) Nucleated erythrocytes with haemoglobin, (iii) Bilobed tongue attached at anterior end.

Frogs have a closed circulatory system, nucleated RBCs with haemoglobin, and a muscular bilobed tongue adapted for capturing prey.