The number of cranial nerves in humans are :

1. 12
2. 31 pairs
3. 31
4. 12 pairs

Gigantism and Acromegaly are due to:

1. Hypersecretion of Growth hormone
2. Hypersecretion of Thyroxine
3. Hyposecretion of Growth hormone
4. Hyposecretion of Thyroxine

The circular opening in the centre of iris :

1. Lens
2. Cornea
3. Sclera
4. Pupil

The blood vessel that carries oxygenated blood is :

1. Pulmonary artery
2. Pulmonary vein
3. Renal vein
4. Hepatic vein