9700/13 Biology Oct Nov 2020 Online Test | Cambridge AS and A Level MCQ

Which evidence supports the cohesion-tension theory for the movement of water in flowering plants?
1 When the rate of transpiration of a tree is maximum, the diameter of the trunk is minimum.
2 When a plant shoot is removed close to the base of the stem, sap leaks out from the cut.
3 Evaporation of water from a porous pot can exert a force that draws water up a glass tube attached underneath the pot.
4 Droplets of…