Question

The Ampullae of Lorenzini are present in which of the species?
A. Fish
B. Lizard
C. Frog
D. Rabbit

Answer 1

Hint: The ampullae of Lorenzini are special sensing organs. These are called electroreceptors, forming a network of jelly-filled pores. The ampullae may also allow the cartilaginous fishes to detect changes in water temperature. Each ampulla is defined as a bundle of sensory cells containing multiple nerve fibers.

Complete answer:
Electroreceptors of elasmobranchs are called ampullae of Lorenzini which are present in the cartilaginous fishes. These receptors are present in sacs. These sacs open to pores on the body surface. The canals that connect the sac and pores is a very good conductor of electric charge, are filled with jelly and allows these fishes to detect the electrical fields generated by the muscle contractions of the prey.
The ampullae of Lorenzini are modifications of the lateral line system. These sensory organs are sensitive to the electrical field. Just beneath and parallel to the skin, they form a series of tube-like structures. On the ventral and dorsal surfaces of the snout and posterior to the eye, the ampullae are particularly located. Upon Squeezing the snout, a thick fluid emerges from the ampullae through pores in the skin.
Lizard, frog, and rabbit do not have ampullae of Lorenzini as they have other sense organs.
So, the correct answer is “Option A”.

Note:
Elasmobranchii is the subclass of cartilaginous fishes comprising the sharks and rays. Ampullae of Lorenzini which are sensory organs are a network of electroreceptors that can detect electric fields in water, found in Chondrichthyes. A series of symmetrical pores The ampullae concentrated around the snout and nose, connected by gel-filled canals.