Question

stokes and anti-stokes lines are observed in, -----​

Answer 1

Stokes lines are of longer wavelength than that of the exciting radiation responsible for the fluorescence or Raman effect. Anti-Stokes lines are found in fluorescence and in Raman spectra when the atoms or molecules of the material are already in an excited state (as when at high temperature).

this is the definition of Stokes lines and antistokes lines i hope that you have got the answer