Which of the following statements are true in relation to transpiration and water movements in plants?
1. Removing all the leaves from a plant will reduce the flow of water up the stem.
2. Covering both sides of a leaf with a plastic film will reduce both stomatal and cuticular transpiration.
3. Injecting detergents (which lower the surface tension of water) into the xylem of tree trunk could prevent water from reaching the upper branches.
4. Along most of its route through a plant, water moves by diffusion either along cell walls or across protoplasts.
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