 All right, so why did the colour change? Well, it turns out that plants take up water from the soil through their roots. And through their roots, it goes to the stem and then it's spread throughout the plant. But how does the water travel inside the plant? Well, it turns out plants have something like pipes. And we have seen pipes installed in our homes, which help in carrying water throughout the home, right? Similarly, plants also have these hollow pipes, which are called xylem. And this xylem is present in roots. It's present in leaves and stems. And through the roots, water enters into the xylem. It moves up and as it goes and reaches to the leaves, it starts evaporating. So now more water can be drawn up from the soil through the roots. And when that water reaches the leaves, it evaporates. So more water can be drawn up. And this is how water is transported throughout the body of the plant. And when we kept the cabbage leaf in the food colors, that's what we saw, right? The water was spread throughout the leaf. So over here, xylem is also present in the leaves, right? And that is why water could be drawn up through the xylem. And that's why it spreads throughout the leaf. So water is transported to all parts of a plant and a tree through xylem.