Environmental Science shares 1/5 or 20 % of the TNTET Paper 1 Question Paper. Surely 30 questions out of 150 questions of Paper 1 will be from environmental Science. Here is the series of comprehensive study materials and most expected questions in quiz format for all TRB TNTET 2013 aspirants. These materials are my own preparation. All questions are in simple English easy to understand if you know to read English. If any doubts mail me immediately. Say thanks (Join via Google Plus) if these materials are useful. All the best !