Question

Nocturnal animals (animals which sleep during the day and come out at night) tend to have  wide pupils and lot of rods in their retinas. Suggest reasons for this.

Answer 1

Nocturnal animals, such as owls, tend to have wide pupils and several rod cells in their retina because wide pupil allow more light to enter the eyes and the rods cells in the retina are sensitive to dim light and are vital for night vision.