Yes, now a days often the Employer instructs to keep a 'Termination Simpliciter' clause, which gives an absolute right to the Employer to terminate his/her employer at any point of time without assigning any cause or even a notice! This is actually every Employers are practicing!
Now at the same point of time it is also a fact that if the termination of service is a colourable exercise of the power vested in the management or as a result of victimisation or unfair labour practice, the Industrial Tribunal would have jurisdiction to intervene and set aside such termination (The Chartered Bank, Bombay v. The Chartered Bank Employees' Union).
But still Employees maximum number of Employees prefer not to challenge their termination and chose to remain in the good books of Employers so that the door of employment does not gets permanently closed!