NVESTIGATORY PROJECTS 1.Effect of neem soluation on mosquito larvae 2.Microbes in human welfare 3.Lifestyle disorder 4.Air pollution 5.Global warming 6.Healthy skin 7.Antibiotics and resistance 8.Water pollution 9.Conservation of forest 10.Drug addiction
Answers
An investigatory project is basically any science experiment where you start with an issue or problem and conduct research or an investigation to decide what you think the outcome will be. After you've created your hypothesis or proposal, you can conduct a controlled experiment using the scientific method to arrive at a conclusion.
Water pollution
River water is the source of fresh water and is very important for a sustained life. We need fresh water for drinking, cooking, and washing. Not only human beings, animals as well as fishes, aquatic plants are depended on clean river water.
The water pollution occurs when pollutants are not removed from the water and discharged into the river. During the rainfall, pollutants that are accumulated such as agrochemicals, industrial waste, and household waste are washed into the river channels.
Materials Required
- 10 empty resealable bottles
- pH paper
- Marker pen
- Freshwater test kit
- Turbidity meter
How To Do
First, locate 5 rivers that originate from an unpopulated hill and has its downstream passes through a town.
Collect 5 samples of the river water upstream and label them as upstream.
Now, collect 5 samples of river water downstream and label them as downstream.
All these 10 bottles of water need to be tested for acidity and turbidity using the pH paper and turbidity meter respectively.
Use the freshwater kit to test the water’s ammonia and nitrate content.
Observation
The acidity of the water sample that is collected at downstream is higher than that of water samples of upstream. The ammonia and nitrate content, as well as turbidity, is also higher in downstream water samples.
For more information on CBSE exams, syllabus and notifications, stay tuned with BYJU’S. At BYJU’S, CBSE students are also provided with the latest sample papers, question papers, worksheets and other exam materials to help them learn in a better way.