Apparatus: A small beaker, half glass of water, red ink, a plant containing all its                                         roots and leaves.(select a plant whose veins can be seen clearly).

Procedure: Pour the water in the beaker and add a little red in to it.
                    Now place the plant in such a way that the root and a little part of the                       stem is submerged inside the water.
                    Wait for a day.
                    And then you see that the roots have a hint of that red colour inside                         them and the stem veins on the leaves turn red.
This proves that the roots absorb the water because only the roots were inside the water.
You can observe the change in the colour in the plant.
Check the photos below.
Please mark it as the best.
Hope it works out. Thank you.