Question

Internal fertilization and viviparity are the characteristics of
1) Magur
2) Pterophyllum
3) Labeo
4) Scoliodon​

Answer 1

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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 Super Class Pisces. Members of this class have internal fertilization and are viviparous. Hence, option (4) is correct.
• Magur belongs to the Class Osteichthyes. Members of this class have external fertilization and are oviparous. Hence, option (1) is incorrect.
• Similar to Magur, Pterophyllum and Labeo also belong to the Class Osteichthyes. These are fresh water bony fishes following external fertilization and are oviparous. Hence, both option (2) and (3) are also incorrect.