Question

In Torpedo (electric ray), electric organs are present as modified musculature.
A. Nostrils and mouth
B. Pectoral and caudal fin
C. Gills and eyes
D. Eyes and nostrils

Answer 1

Hint:The electric organs of a torpedo are a pair of kidney-shaped organs at the base of the pectoral fins. It is positioned laterally to the gills, into the anterior to mid-section of both pectoral fins. It is formed by greatly enlarged pectoral fins fused to the head. Underneath the disc are the mouth, nostrils, and five pairs of gill slits.

Complete answer:The electric rays are a group of flattened cartilaginous fish that have enlarged pectoral fins, which belong to the order of Torpediniformes. As the name suggests, they are capable of producing an electric discharge, which can range from 2 to 200 volts, depending on the type of species. The major use of this ability is to stun prey and to defend itself from predators. There are approximately 70 species of electric rays divided into four families.
The electric ray is one of the few electrosensitive fishes. They have eyes on the top anterior portion of their heads, which often results in poor vision which is often compensated by their electromagnetic sensory organs which also enable them to detect electricity. Many species of electric rays have two large electric organs on either side of their head, where current passes from the lower to the upper surface of the body.

These organs are used to catch prey, ward of predators, and much more. These organs are connected and controlled by a complex set of nerves that directly connect to the brain. The electricity is produced within the organ by battery cells which are honeycomb-shaped ionically charged structures.

Therefore, the correct answer is option B.

Note:The electric ray often uses its tail to discharge the electric bolt produced from these organs. The electricity produced is enough to kill and electrocute a human being. This bolt is sent to the tail via an insulated chamber that travels from the organs to the tail. Unlike other marine fishes the rays do not have distinct fins and the top circular flap is considered as the pectoral fins.