Question

‘Ampullae of Lorenzini’ are present in
A. Fish
B. Lizard
C. Frog
D. Rabbit

Answer 1

Electroreception, the ability to sense in the atmosphere weak electrostatic fields that occur naturally. A variety of vertebrate species; a group of ray-finned fish and monotreme egg-laying mammals are considered to be electroreceptive.

Complete answer: The lateral line system, sometimes referred to as the lateral system, is a system of tactile sense organs specific to aquatic vertebrates, from cyclotomic fish (lampreys and hagfish) to amphibians, which senses movements and changes in the intensity of the surrounding water. It consists of a collection of mechanoreceptors called neuromasts (lateral line organs) organized around the head and body in an interconnected network. Rows of neuromasts appear on the surface of the skin at their simplest, but they lie deep in the floor of mucus-filled systems called lateral line channels for most fishes. These canals are positioned just under the surface, extending into the canal only the receptor portion of each neuromast. A cluster of sensory and support cells are made up of neuromasts encapsulated inside a jellylike sheath called the cupula. Each sensory cell or hair cell carries numerous small cilia, and each cilium can be stimulated in a single direction by water movement or pressure.
Some neuromasts in sharks and rays have been evolutionarily changed to become electroreceptors called Lorenzini ampullae. These receptors are based on shark heads and can recognize the minute electrical potential produced by the prey's muscle contractions. Lorenzini ampoules can also detect the electromagnetic field of the Planet, and sharks apparently use these electroreceptors for homing and migration. Thus from the above discussion, it is clear that ‘Ampullae of Lorenzini’ are present in fishes.
Hence, the correct answer is option A.

Note: Chemoreceptors are stimulated by changes in the concentration of chemical compounds. Receptors of pain are stimulated by damage to tissues. Thermoreceptor receptors are stimulated by temperature shifts. Mechanoreceptors are stimulated by pressure or movement shifts and photoreceptors are stimulated by energy from light.