Read the following statements regarding respiration in frogs: I. In water, skin acts as the aquatic respiratory organ. II. Gas exchange through the skin occurs by active transport of dissolved oxygen. III. On land, the buccal cavity, skin, and lungs act as respiratory organs. IV. The lungs of a frog are paired, elongated, pinkish, sac-like structures present in the upper part of the trunk region. How many of the abov

Step-by-step solution

Statement I is correct: In water, frogs exhibit cutaneous respiration where the moist skin acts as the sole respiratory organ. Statement II is incorrect: Gas exchange through the skin occurs by simple diffusion, not by active transport. Statement III is correct: On land, frogs use three distinct organs for respiration: the buccal cavity, skin, and lungs. Statement IV is correct: According to NCERT, the lungs of a frog are a pair of elongated, pinkish, sac-like structures located in the upper part of the trunk regio