Q. With reference to dogfish shark, which of the following statement(s) is/are correct?
1.They hunt in packs similar to dogs.
2.All the species of these sharks are characterized by smooth dorsal fin spines.
3.These sharks are relatively larger compared to other shark species.
Select the correct answer using the codes given below:
Answer: B
Notes:
Explanation –
Statement 1 is correct. Dogfish sharks are known to hunt in packs, sometimes numbering in the thousands, which is why they are named after dogs.
Statements 2 and 3 are incorrect. While some species of dogfish sharks, like the smooth dogfish (Mustelus canis), have smooth dorsal fin spines, others, such as the spiny dogfish (Squalus acanthias), have sharp spines in front of their dorsal fins. Even the newly discovered species – Squalus hima, has smooth dorsal fin spines. Dogfish sharks are relatively small compared to many other shark species.
Source: The Hindu
