Tag: Class 12th Exam Biology Objective MCQ Question Chapter Wise in English

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. […]