Question

Lateral line system occurs in
A) Star fish
B) Jellyfish
C) Dog fish
D) All of the above

Answer 1

Hint:The lateral line system is extremely valuable and it is the only system for aquatic animals' that helps in movement. In addition, amphibians live on land as well as water and they already have a system to direct their movement on terrestrial habitat and thus, the system is not much required.

Complete answer:
The lateral line system is defined as a type of sensory system found in fishes and aquatic amphibians. This system is extraordinary to aquatic vertebrates.

With the lateral-line system, fishes show capability to measure the relative movements between their bodies and the surrounding water at each of up to several thousand sensory organs. The ability to detect the flow of water by the means of the hair cells of the lateral line system is a unique feature of this system.

Now let us find solution from given options:
Star fish : It is a kind of Echinodermata. They have a water canal system in place of the lateral line.
Jellyfish : It is a kind of Mollusca. They have radula that is mantle cavity in place of lateral line.
Dog fish : Fishes such as take the help of their lateral line to locate prey, escape from their predators, and form cohesive patterns.
All of the above : As only one of the options is correct, this option cannot be correct.

Hence the correct answer is option ‘C’ i.e, dog fish.

Note:In some species the receptive organs of the lateral lines have been modified and allowed to function as an electroreceptor which are used to detect the electrical impulses. Lateral lines are usually helpful in Schooling, preying and orientation.