can u pls provide me list of some really good investigatory projects...in physics and biology?

You can choose any of the following topics for your investigatory projects.
Biology
1.The effectiveness of Antiseptics and soaps on household bacteria
2.Best conditions for mushroom production
3. The effects of antibiotics on bacterial count
4. Which disinfectant kills the most bacteria and Which disinfectant is safest to use.
5. Separation of DNA and its separation through gel electrophoresis.
6. Biogas production from cow dung.
7. Estimation of nicotine in different brands of cigarette
8. Estimation of acid content in different fruits and vegetable juices etc.
9. Any human disease like Typhoid, Malaria, Leptospirosis, Heart diseases etc. can be taken as a topic and collect the complete information with statistical data and a support of statistical analysis about these diseases.
10. You can also choose the prevalence of deficiency diseases like night blindness, rickets, aneamia, scurvy as your topic and collect the complete information with statistical data and a support of statistical analysis about these diseases.
11. Collection of different varieties of plants and making a herbarium and studying their characters1
2. Study of different types of microorganisms found in samples like soil, curd etc
13. Study of nitrogen fixation in various plants.  
Physics
1. Any one of following would make a decent project.
2. Light - telescope, simple projector
3. Electricity : Simple circuit
4. Magnetism: Deflection due to current, simple generator, solenoid
5. Transmitter
6. Receiver
7. Door counter
8. Fire alarm
9. AC generator

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