Question

Nocturnal animals like owl and bat have:
A). Large cornea
B). Large pupil
C). A retina with a large number of rods
D). All of the above

Answer 1

Hint: Nocturnal animals hunt for prey in the night. Their eyes are designed so as to make maximum vision at night. The eyes have special abilities and functions than normal birds and mammals. We can see the functions one by one and analyze the nocturnal animals.

Complete step-by-step solution
Nocturnal animals are those which hunt for food in the night time. They have special seeing and hearing ability which help them locate their prey with accuracy and ease. The features of their eyes include –
a). The large cornea: Cornea being the largest part of the eye, the larger the size the more it can accommodate the light in the eyes for proper vision.
b). The large pupil: The size of the pupil in most mammals varies with the amount of light available. The pupil adjusts itself for daylight and night to protect the eyes. Nocturnal animals being active in the night possess large pupils to accommodate maximum possible light and enable night vision.
c). A retina with a large number of rods: The rods are the light-sensitive parts of the eyes. The more the number of rods higher the sensitivity towards light, i.e., The maximum available light can be sensed by the brain.
From the above explanation, all the options given in the question are true for nocturnals. Option D is the right answer.
Additional Information: They have special sound detecting abilities also.

Note:The nocturnal animals are evolved from constant exposure to low light. They developed special features during the course of long years to adapt to their lifestyle. These animals are valid proof for the theory of evolution.