In this category, we add all the diy school project models for secondary school students,(Class 9 / Grade 9).
Where students can do themselves step by step for their school exhibition or fair
Introduction: The respiratory system includes nose, pharynx, larynx, trachea, bronchi and lungs. Lungs are the pair of organs that look like air filled balloons located on either side of the chest. Lungs are responsible for pumping the oxygen into the blood through the process of respiration. In this process, air is breathed through the mouth, … Read more
Introduction: Oxygen cycle is defined as the circulation in various forms through nature. Oxygen cycle is always interconnected with carbon cycle. The oxygen cycle has four main reservoirs atmosphere, inner crust of the earth, hydrosphere and lithosphere. The critical factor that runs the oxygen cycle is the process of photosynthesis, which leads to the earth’s … Read more
Introduction: Water pollution is defined as the contamination of the sources of water due to various pollutants, human activities. Water pollution is serious health hazard that threatens the human life because it is the most important source of functioning in the human body. The sources of water that get effected due to water pollution are … Read more
Introduction Imagine humans and animals stay alive through food and water. Similarly, plants also need food and water to stay alive. This process where the plants survive is called as photosynthesis. Plants breathe carbon dioxide from the air and release oxygen back into the air. They also use the sunlight and water to carry out … Read more
Introduction The greenhouse effect is the process in which the gases in the atmosphere of the earth trap the heat from the sunlight and release more heat and radiation on to the earth. The important greenhouse gases are: Thus increasing the temperatures on the earth. In simple terms, it is the process that warms up … Read more