Explanation (in paragraph):
To show that transpiration takes place through leaves, a healthy potted plant is taken and its soil surface is covered with plastic to prevent evaporation from the soil. A dry blue cobalt chloride paper is placed on the surface of a leaf and another similar paper is kept away from the plant as a control. After some time, it is observed that the cobalt chloride paper placed on the leaf turns pink faster, while the paper kept away remains blue for a longer time. This happens because water vapour is released from the leaves during transpiration, which turns the cobalt chloride paper pink. Hence, this experiment proves that transpiration occurs through leaves.
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