• Rods are sensitive to dim light Cones are sensitive to bright ligh
• Contain rhodopsin pigment Contain iodopsin pigment
• Does not help in seeing colors Help in seeing colors

The third eyelid is vestigial and is called as nictitating membrane or Plica Semilunaris,

• Meibomian or tarsal glands are present along the edge of the eyelids. They produce an oily secretion which serves to lubricate the corneal surface and hold a thin layer of tears over the cornea.
• Meissners corpuscles are located in the papillary layer of skin dermis just below the epidermis which responds to touch
• In a movie, pictures are projected on a screen at the rate of about 24 pictures per second, but we cannot see the individual frames on account of the after-images in our eyes. The life-like continuous movement on the screen is an illusion.

• Flavour is a combination of taste and smell while eating or sipping. If you hold your nose, you will find that grated apple and grated onion taste alike-slightly sweet. Cold with blocked nose has the same effect and makes food taste/smell flavourless.
• Ottis media is the infection of the middle ear which is characterized by severe pain and pus discharge.