Question

The avian/reptilian eyes are peculiar because of the presence of

• A. Pecten
• B. Large number of cones
• C. Large pupil
• D. Sensitive retina

Answer 1

The correct option is A Pecten

A) Pecten is a comb-like structure of blood vessels present in the choroid of the eyes of reptiles and birds which nourishes the retina and gives the eye a peculiar appearance.

B) The number of cones in reptilian and avian eyes are similar to mammalian eyes.

C) Reptiles have a slitted pupil that helps in night vision. Birds have large pupils to allow more light through and can sense more colours than human do, along with colours from the ultraviolet spectrum.

D) Birds and reptiles have sensitive retinas, but this does not alter the appearance of their eyes.

So the correct answer is 'Pecten'.