SECTION A
1. Heat conductivity of metal / non-metal or reactivity of metal with oxygen
2. Nervous system / Endocrine system / Continuous or discontinuous variation
3. Radioactive / Periodic table
5. Culture Knop solution / Thermoplastic or thermosets
SECTION B
6. Pin-hole camera / mitosis / meiosis
7. Soap / fats
8. Mirror / Light colour
9. Alloy / Haber process (Ammonia)
SECTION C
10. Inertia
11. Depletion ozone or water / air pollution
12. Electrolysis for extraction or purification / Thermoplastic & Thermosets
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