Class 12th Exam Biology Objective MCQ Question Chapter Wise in English 16. ENVIRONMENTAL ISSUES 1. Which of the following is not a green house gas ? (A) Methane (B) Chlorofluorocarbon (C) CO2 (D) Nitrogen Answer :- (D) 2. Biogas contains : (A) CO2 (B) H2S (C) CH4 (D) All of these Answer :- (D) 3. […]
