The basic sensory unit of a lateral system is/are the:

Correct option is B

Correct Answer: (b) Neuromast
Explanation:
→ Neuromasts are mechanoreceptive units of the lateral line system, detecting vibrations and water movements.
→ Located either on the skin (superficial) or inside canals (canal neuromasts).
→ Crucial for schooling, prey detection, and navigation.
Information Booster:
→ Each neuromast contains hair cells similar to those in the inner ear.
→ Lateral line is especially important in turbid or dark environments.
→ Works with vestibular and visual systems for orientation.
Additional Information (Other Options):
(a) Ampullae of Lorenzini – electroreception in sharks.