Which evidence supports the theory of water movement by root pressure 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 water form at the edge of leaves of plants growing in conditions of soil with high water content and air with high humidity.
1 )
1 and 2
2 )
1 and 3
3 )
2 and 3
2 and 4
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