Biology · STRUCTURAL ORGANISATION IN ANIMALS

Consider the following statements regarding the vascular and respiratory systems of frog: (A) The lymph in frog lacks few proteins and erythrocytes (RBCs). (B) A special venous connection between the kidney and lower parts of the body is called the renal portal system. (C) During aestivation and hibernation, frog respires mainly by lungs. (D) RBCs of frog are enucleated and biconcave like mammalian RBCs. Which of the above statements are correct?

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