Question

Snake has
A) Movable eyelids
B) No eyelids
C) Immovable eyelids
D) Eyelids placed in pouches.

Answer 1

Hint: The snake is a reptile that comes under vertebrates. Vertebrates are subdivided into Pisces, amphibians, reptiles, birds and mammals. These are also referred to as chordates as they contain the backbone. All the crawling creatures like lizards, snakes, crocodiles are examples of reptiles.

Complete answer:
Let us see the distinguishing features of reptiles. Their entire body is covered with scales. These are ectothermic which means cold blooded animals, i.e. they cannot regular their body temperature according to the environment. Heart is three chambered except for the crocodile which has 4 chambered hearts. All the reptiles have well developed ears except snakes. They are oviparous and reproduce through eggs. They have two pairs of limbs bearing claws except snakes. Lateral line system which means a system of sense organs is absent in reptiles. All the reptiles have movable eyelids except snakes. All the snakes and a few lizards contain a fused and immovable lid called spectacle instead of eyelid and for this reason, they can never close eyes or can blink. Based on the above explanation, it is clear that snakes do have eyelids but these are immovable.

Hence the correct answer is option C.

Note:
When compared with other reptiles, snakes show some clear differences, that is, they don't have limbs, movable eyelids and external ear openings unlike other reptiles. Some of the reptiles have a third eye known as a partial eye. This is a photosensory organ which is part of epithalamus and plays an important role in thermoregulation.