Brainlag PlusWhat each biology required practical does, food test colours, hazards, improvements and planning.
The practicals at a glance
Microscopy, osmosis, food tests, enzymes and pH, photosynthesis, reaction time, field investigations (plus culturing microorganisms, plant responses and decay for separate Biology).
| Test | Positive result | Shows |
|---|---|---|
| Benedict's, heated | brick red | reducing sugar |
| iodine | blue-black | starch |
| biuret | purple | protein |
| ethanol, then water | cloudy white | lipid |
The rest of this lesson and its 8 practice questions are in Plus.
Screen 1 of 1, free to read.
- 8 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards