b Explain the results in each tube. (Remember that living organisms all respire all the time, and that plants also photosynthesise in the light.) Tube A Tube B Tube C Tube D Predict the results that would be obtained if all the tubes were left in the dark. d Discuss what these results and your predictions in C suggest about whether or not it is good to have living plants in a fish tank.

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By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.