Question

internal fertilization and viviparity are the characteristics of
1) magur
2)pterophyllum
3)labeo
4)scoliodon
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Answer 1

$\huge \bold \color {blue}{Answer}$ Internal fertilization is characterized by sperm fertilizing the egg within the female; the three methods include: oviparity (egg laid outside female body), ovoviparity (egg held within female), and viviparity (development within female followed by live birth.

Answer 2

Internal fertilization and viviparity are the characteristics of 4)scoliodon

• Scoliodon belongs to the class Chondrichthyes of superclass Pisces. It's a marine organism having a cartilaginous endoskeleton.
• It possess placoid scales on its body. Moreover, the skin is known to be tough in nature.
• The fish has to swim continuously due to absence of air bladder.
• Since, all Chondrichthyes show internal fertilization and viviparity. Hence, 4)scoliodon is the correct answer.