aqa a-level biology: transpiration Questions & Answers(RATED A+)

Why is transpiration passive and translocation active? - ANSWERThe energy for transpiration is supplied by the Sun. The energy for translocation is supplied by vascular tissue which carries out active transport, requiring ATP. What are the main features of the xylem in which water is transported? (3) - ANSWER1. Long hollow tubes - made of dead cells > UNRESTRICTED water flow along tube. 2. Extra thickening - lignin in cell walls > waterproof > strength/support. 3. Pits - areas with no lignin > allow water to move BETWEEN xylem vessels, important if damaged vessel. What is the importance of water to the plant? - ANSWER1. Photosynthesis in palisade cells of leaf (requires water). 2. Keeps cells turgid > providing support. What is the main factor responsible for the movement of water up the xylem? - ANSWERCohesion-tension. What is cohesion-tension? - ANSWER1. Water molecules stick to each other via