International A Level Biology / Plant structure and function

Core practical 9: antimicrobial plants and aseptic technique revision notes

Edexcel International A Level Biology (YBI11), chapter 10: Plant structure and function, specification point 4.12. Part of the full course.

Watch the video lesson · International A Level Biology past papers

This practical tests whether plant extracts stop bacteria growing, using clear zones around paper discs. Careful controls and aseptic technique make the results safer and more reliable.

More lessons in Plant structure and function

• Cellulose and the plant cell wall
• Plant cell ultrastructure
• Xylem, phloem and sclerenchyma
• Plant fibres, starch and sustainability
• Core practical 7: plan diagrams of roots, stems and leaves
• Water, nitrate, calcium and magnesium
• Investigating plant mineral deficiencies
• Core practical 8: tensile strength of plant fibres
• Conditions for bacterial growth and plant antimicrobials
• From digitalis soup to three-phase trials