This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
ScanSolve AI Answer
Step 1: The frog's heart has three chambers—two atria (right and left) and one ventricle. Statement I is correct. Step 2: The sinus venosus receives deoxygenated blood from major veins and opens into the right atrium (not the left atrium). Statement II is incorrect. Step 3: Frogs respire through skin (cutaneous respiration); deoxygenated blood from skin capillaries drains via cutaneous veins into the femoral veins, then to the sinus venosus. Pulmonary veins carry oxygenated blood only from lungs to the left atrium. Statement III is incorrect. Step 4: From the single ventricle, blood enters the truncus arteriosus, which divides into systemic arches (to body) and pulmocutaneous arches (to lungs and skin). Statement IV is correct. Correct statements: I and IV. (b)