GCSE Triple Biology Paper 1 - Photosynthesis (B8)

💡 Quick tip: Remember that photosynthesis is basically the opposite of respiration - plants take in CO₂ and release O₂, whilst we do the reverse.

💡 Remember: Guard cells control the stomata - when they're inflated (turgid), stomata open; when they collapse (flaccid), stomata close.

💡 Exam tip: This is a classic required practical - make sure you know that iodine tests for starch and turns blue-black when starch is present.

💡 Key point: On sunny days, CO₂ is usually the limiting factor because plants quickly use up all the available CO₂ around them.

💡 Maths connection: This law appears in physics too (with gravity and electromagnetic forces), so understanding it here helps across multiple subjects.

💡 Practical tip: Always leave 5 minutes for acclimatisation at each distance before counting bubbles - this ensures accurate results.