Biology · STRUCTURAL ORGANISATION IN ANIMALS

Consider the following statements regarding the respiratory modes in Rana tigrina: (A) Cutaneous respiration involves exchange of dissolved oxygen by diffusion. (B) Pulmonary respiration involves a pair of elongated, pink coloured sac-like lungs located in the thorax. (C) During aestivation, the frog respires using buccal cavity and lungs. (D) On land, skin, buccal cavity, and lungs act as respiratory organs. Which of the above statements are correct?

1. A
   (A), (C) and (D) only
2. B
   (A), (B) and (D) only
3. C
   (B) and (C) only
4. D
   (C) and (D) only