Question

A homocercal tail is found in
a. Teleosts
b. Sharks
c. Rays
d. Lung fishes

Answer 1

A homocercal tail is a caudal fin made out of two flaps of equivalent extent. Homocercal tails are the most widely recognized caudal balance type in fish however can come in numerous even shapes. A homocercal tail appears differently in relation to a heterocercal tail which has inconsistent projections.

Complete answer:
The homocercal tail is a tail wherein the upper and lower flaps of the tail are practically even and the vertebral segment closes at the center of the base. It is found in class Osteichthyes.
• Teleosts (ray finned fishes) and lungfishes have a place with class Osteichthyes. They have a homocercal tail however lungfishes are lobed fin fishes.
• Sharks and beams have a place with class Chondrichthyes and have a heterocercal tail.
• Lungfish are freshwater rhipidistian fish having a place with the request Dipnoi. Lungfish are most popular for holding attributes crude inside the Osteichthyes, including the capacity to inhale air, and structures crude inside Sarcopterygii, including the presence of lobed balances with a very much created inward skeleton.
• Teleosts are portrayed by a completely versatile maxilla and premaxilla (which structure the gnawing surface of the upper jaw); the mobile upper jaw makes it workable for teleosts to jut their jaws when opening the mouth. Teleosts are likewise recognized by having completely homocercal (even) tails.

Hence, the correct answer is option (A).

Additional information:
The contrast among teleosts and other hard fish lies primarily in their jaw bones; teleosts have a versatile premaxilla and relating alterations in the jaw musculature which make it workable for them to project their jaws outwards from the mouth.

This is an extraordinary bit of leeway, empowering them to snatch prey and bring it into the mouth. In more inferred teleosts, the amplified premaxilla is the primary tooth-bearing bone, and the maxilla, which is joined to the lower jaw, goes about as a switch, pushing and pulling the premaxilla as the mouth is opened and shut.

Different bones further back in the mouth serve to granulate and swallow food. Another distinction is that the upper and lower flaps of the tail (caudal) balance are about equivalent in size. The spine closes at the caudal peduncle, recognizing this gathering from other fish in which the spine stretches out into the upper projection of the tail blade.

Note: Teleosts are monetarily imperative to people, as is appeared by their portrayal in craftsmanship throughout the long term. The fishing business harvests them for food, and fishermen endeavor to catch them for sport. A few animal varieties are cultivated financially, and this technique for creation is probably going to be progressively significant later on. Others are kept in aquariums or utilized in examination, particularly in the fields of hereditary qualities and formative science.