Pollution: Water, Noise, Air and Soil - collegedunia.com
https://collegedunia.com/exams/pollution-water-noise-air-soil-biology...13.04.2022 · Pollution is a part of CBSE class 12 Biology syllabus unit 10, Ecology and Environment. It carries a total of 6 to 9 periods and 3 to 4 marks. Air pollution, water pollution, noise pollution, and soil pollution are the four main types of pollution. Additionally there are few more, i.e., thermal pollution, radioactive pollution, light pollution ...