Question

Fertilization in Scoliodon is
A. External
B. Internal
C. Both (A) and (B)
D. None of the above

Answer 1

They are a genus of cartilaginous fish also known as dog fish. They give birth to young ones. Fertilization takes place inside the body.

Complete answer:
Scoliodon is a species of requiem predator sharks in the Carcharhinidae family. The shark is an aquatic, carnivorous mammal. It eats small pelagic fishes and bottom living bony fish.

Scoliodon is a spindle-shaped, elongated mammal. The body is laterally compressed. A completely formed specimen of the genus grows upto 60 cm. The body is separated into the head, trunk, and tail. It has a dorsoventrally flattened head that ends in a dorsoventrally compressed snout. The skin is tough, containing minute placoid scales.The dorsal surface of Scoliodon is dark-grey in colour while the underside is pale white. They have to constantly keep swimming to avoid sinking as the air bladder is absent.
In Scoliodon, fertilisation is internal. The fertilisation of mature eggs takes place in the oviduct segment between the oviduct funnel and the shell gland. The Scoliodon is a viviparous animal. Egg formation begins in the uteri. It Gives birth to its young.

Thus, the correct answer is option B i.e., Internal

Note: During the copulation, one or both of the male claspers are inserted into the female cloaca and are held in place by the terminal parts. The spermatic fluid is pushed into the oviducts by the grooves of the claspers through the vagina.