Biological Classification And System Of Classification / जैविक वर्गीकरण और वर्गीकरण की प्रणाली
UPSC
Biology
Biological Classification And System Of Classification / जैविक वर्गीकरण और वर्गीकरण की प्रणाली
Question Bank
Biology Classification/ Cell & Its Division
question_answer
Which one of the following is a free living bacterium that helps in nitrogen fixation in soil? [CDS]