AQA- A LEVEL BIOLOGY TRANSPIRATION REVISION EXAM QUESTIONS WITH CORRECT ANSWERS PROVIDED 2025/2026 EDITION

AQA- A LEVEL BIOLOGY TRANSPIRATION REVISION EXAM QUESTIONS WITH CORRECT ANSWERS PROVIDED 2025/2026 EDITION Structure of the xylem -1. Dead cells form hollow tubes with no cytoplasm: easier water flow 2. No end walls: water forms continuous column 3. Xylem walls strengthened with lignin: withstands hydrostatic pressure and waterproof 4. Xylem pits in between cells: water can move laterally and avoid blockage Cohesion-Tension theory mark points -- Water enters leaf and is pulled up under tension - Forms continuous column in xylem - Water molecules form weak H2 bonds and stick together in COHESION - Water molecules are attracted to the xylem walls in ADHESION - The pulling force is great and the water column is under TENSION The movement of water is the TRANSPIRATION STREAM