Rahul inserted a hairpin into his right ear to remove ear wax. He felt a sudden sharp pain with loss of hearing. This was due to:

1. Rupture of eardrum
2. Rupture of vestibule
3. Rupture of cornea
4. Rupture of pinna

The antiseptic present in tears:

1. Iodine
2. Hydrogen peroxide
3. Lysozyme
4. Lysosome

Keshav enters a dark room from a brightly lit area. He experiences difficulty in viewing objects, but gradually his vision improves.

Explain the role of the photoreceptors in this case.

During light adaptation:

1. Rods and cones become active.
2. Rods and cones become inactive.
3. Rods become active and cones inactive.
4. Cones become active and rods inactive.