International A Level Biology / Plant structure and function

From digitalis soup to three-phase trials revision notes

Edexcel International A Level Biology (YBI11), chapter 10: Plant structure and function, specification point 4.13. Part of the full course.

Watch the video lesson · International A Level Biology past papers

Drug trials use increasingly large groups to test safety and effectiveness. Placebos, random allocation and double blinding help researchers tell whether a drug works and reduce bias.

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
• Core practical 9: antimicrobial plants and aseptic technique