1. Genetic Engineering and Climate Change: Role of transgenic plants in reducing carbon dioxide, suberin production in roots, micropropagation, and tolerance to high salt concentrations.

2. Nitrogen Cycle and Soil Microbiology: Experimental setup for testing nitrate presence, sterilization effects on soil bacteria, and role of ammonium salts in nitrogen conversion.

3. Photosynthesis and Light Intensity: Oxygen exchange in Chlorella, photosynthesis equation, light intensity effects on gas exchange, and use of hydrogen-carbonate indicator for CO₂ investigation.

4. Human Excretory System and Homeostasis: Kidney function, nephron filtration, urine concentration during dehydration, and factors affecting glucose and protein filtration.

5. Enzymes and Digestion: Bromelain activity in pineapple juice, effect of pH on enzyme efficiency, protein digestion test, and enzyme-controlled reaction variables.

6. Genetics and Gene Therapy: Beta thalassemia cause and symptoms, RNA role in gene editing, protein synthesis process, and comparison of gene therapy with traditional blood transfusions.