Male frogs can be distinguished from female frogs due to the presence of A. Bulging eyes B. Vocal sacs C. Webbed digits in feet D. Copulatory pad on first digit of fore limbs E. Olive green-coloured skin with dark irregular spots Choose the correct answer from the options given below

Core Logic

A. Correct - In frogs, the special venous connection between the liver and intestine is called the hepatic portal system. B. Incorrect - There are ten pairs of cranial nerves arising from the brain of a frog (unlike humans who have 12 pairs). C. Correct - In female frogs, the ureters and oviduct open separately into the cloaca. D. Incorrect - The midbrain consists of the optic lobes. The hindbrain consists of the cerebellum and medulla oblongata only. E. Correct - In frogs, a triangular structure called the sinus venosus joins the right atrium.

Step 1: Final Conclusion

Thus, the correct statements are (A), (C) and (E).

Pattern Recognition

Frogs = 10 cranial nerves (amphibian trait). Optic lobes = midbrain. Sinus venosus is present and connected to the right atrium.

Chapter Mix

Class 11 Biology: Structural Organisation in Animals