| Column-I | Column-II | ||
| A. | Peripheral neural system | P. | Comprises of all nerves associated with brain and spinal cord |
| B. | Somatic neural system | Q. | Relays impulses from CNS to skeletal muscles |
| C. | Visceral neural system | R. | Transmits impulse from CNS to involuntary organs and smooth muscles |
| D. | Autonomic neural system | S. | Part of PNS where impulses travel from CNS to the viscera and from the viscera to the CNS |
| A | B | C | D | |
| 1. | P | Q | S | R |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
The amount of light entering the human eye is regulated by:
| 1. Pupil | 2. Iris |
| 3. Cornea | 4. Ciliary body |