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Byju's Answer
Standard XII
Biology
Class Chondrichthyes
In Sting Ray,...
Question
In Sting Ray, the stinger is modified
A
Dorsal fin
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B
Ventral fin
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C
Anal fin
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D
Caudal fin
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Solution
The correct option is
A
Dorsal fin
A.
Dorsal fins are single and located at the back of the body of fish.
B.
Ventral fins are also called pelvic fins and are paired. These are generally located behind the pectoral fins.
C. The anal fin is present at the base of the anus on the ventral side.
D.
Caudal fins are the tail fins and maybe homocercal or heterocercal.
Trygon
, known as Stingray has a kite-shaped body with a whip-like tail bearing a spine (the stinger), which is a modified form of the dorsal fin.
So, the correct answer is 'Dorsal fin'.
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1) The body is long, eel like. It shows trunk and compressed tail.
2) Paired fins are absent. Median fin is supported by cartilaginous fin-rays.
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5) In this group, a true coelome is seen.
These characteristics are seen in the class
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