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Friday, May 30, 2008

Do plants drink water?


Objective: To show that water absorbed by the roots is transported in a plant from the stem to leaves and flowers.

Materials Required: A white coloured flower of balsam, carnation or rose, two beakers, red and blue ink, a sharp blade and water.

Procedure: Fill the beakers with water. Add a few drops of red ink into one beaker and a few drops of blue ink in the other beaker. Take a flower with a stem that is atleast six inches long. Using a sharp blade carefully cut the stem into two halfway up towards the flower. Put each stem-half into the beakers as shown in the figure below. You may provide additional support to the flower by putting the set-up against the wall. Keep the set-up undisturbed for two to three hours.

Observation: You will observe that half the flower has turned red while the other half has turned blue. Interpretation: The coloured water has travelled upward through the stem to the petals of the flower. Red and blue lines in the stem indicate the path for conduction of water through the stem.

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