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

Pericardium covers the

1. Heart
2. Brain
3. Spinal cord
4. Eyeball

The circular opening in the centre of iris :

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