Question

What is the meaning of FM reception is almost immune to noise as compared to AM reception physics from chapter communication

Answer 1

FM systems are better at rejecting noise than AM systems. Noise is generally uniformly spread across the spectrum and varies randomly in amplitude. The change in amplitude can modulate the signal and be picked up in an AM system.
FM systems are inherently immune to random noise. For noise to interfere in FM, it will have to modulate the frequency somehow. But the noise is distributed uniformly in frequency and varies mostly in amplitude. Hence, minimum interference is picked up in FM receivers.