1. All these writ petitions, being W.P. (C) No. 251/2015 (Dr. Prasun Chakraborty vs. Union of India and Others), W.P. (C) No. 399/2015 (Dr. Ardhendu Saha and Others vs. Union of India and Others), W.P. (C) No. 549/2015 (Dr. Aparna Nath vs. Union of India and Others), W.P. (C) No. 550/2015 (Dr. Saroj Kumar Das vs. Union of India and Others), W.P. (C) No. 551/2015 (Dr. Manish Pal vs. Union of India and Others), W.P. (C) No. 553/2015 (Dr. Debasish Bhattacharya vs. Union of India and Others), W.P. (C) No. 554/2015 (Dr. Rama Debbarma vs. Union of India and Others), W.P. (C) No. 555/2015 (Dr. Ratul Das vs. Union of India and Others), W.P. (C) No. 556/2015 (Dr. Ajoy Kumar Das vs. Union of India and Others) and W.P. (C) No. 572/2015 (Dr. Priyanath Das vs. Union of India and Others), are clustered for disposal by a common judgment as the questions/ challenges as projected in these writ petitions are substantially identical and having considered the said premise, except the writ petition, being W.P. (C) No. 251/2015, were heard analogously. Since the learned counsel