1. Acids and bases: pH change during neutralisation, reaction type (acid + alkali), precipitate formation with copper sulfate and ammonia, solubility explanation
2. Cell structure and function: root hair cell adaptations (surface area, absorption efficiency)
3. Forces and motion: gravity between objects, air resistance in vacuum, correct force statements identification
4. Astronomy: solar vs lunar eclipse explanation, diagrams, eclipse mechanics and shadow differences
5. Plant tissues: identification of palisade layer, role in photosynthesis
6. Chemical bonding: atom count in reactants and products (ammonia formation), model limitations