Outer hair cells mainly help in:
Correct option is B, Sound amplification. In Sensory System Ear Physiology, the accurate description is Sound amplification, and that is what you should commit to memory. Keep the definition tight and the role clear — the functional job described in the stem is exactly what Sound amplification does in Sensory System Ear Physiology. Then Sound amplification is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Sound amplification. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.