Question 1

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

Accepted Answer

Male frogs can be distinguished from female frogs by the presence of sound-producing vocal sacs and a copulatory pad on the first digit of the forelimbs. These structures are absent in female frogs. Bulging eyes, webbed digits in feet, and olive green-coloured skin with dark irregular spots are morphological features common to both male and female frogs. Therefore, only statements B and D represent the distinguishing features of male frogs. Answer: B and D only

Question 2

Choose the correct statements regarding frog's anatomy : A. Hepatic portal system is the special venous connection between liver and intestine. B. There are twelve pairs of cranial nerves arising from

Accepted Answer

Statement A is correct. The hepatic portal system is a special venous connection between the liver and the intestine in frogs. Statement B is incorrect. There are ten pairs of cranial nerves arising from the brain in frogs, not twelve. Statement C is correct. In female frogs, the ureters and oviducts open separately into the cloaca, whereas in male frogs, ureters act as urinogenital ducts. Statement D is incorrect. The hind-brain consists of the cerebellum and medulla oblongata. The optic lobes

Question 3

In frogs, the number of pairs of cranial nerves arising from the brain are __________.

Accepted Answer

In frogs, the nervous system is organized into a central nervous system, a peripheral nervous system, and an autonomic nervous system. The peripheral nervous system consists of cranial nerves arising from the brain and spinal nerves arising from the spinal cord. There are exactly 10 pairs of cranial nerves present in frogs. Answer: 10

Question 4

What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog?

Accepted Answer

Frog's heart is a muscular structure with three chambers. It receives deoxygenated blood from body parts through the major veins called vena cava. Vena cava carries deoxygenated blood. Aorta and pulmonary vein carries oxygenated blood. Whereas, pulmonary artery will carry deoxygenated blood towards the lungs.

Question 5

In frog, the Renal portal system is a special venous connection that acts to link :

Accepted Answer

In frogs, special venous connection between liver and intestine as well as the kidney and lower parts of the body are present in frogs. The former is called hepatic portal system and the latter is called renal portal system.

Question 6

Which of the following statement is correct about location of the male frog copulatory pad?

Accepted Answer

In male frogs, copulatory pad is present on the first digit of the forelimbs which are absent in female frogs.

Structural Organisation in Animals — Previous Year Questions & Solutions