What is good... WATER

WATER - COLOURING CARNATIONS

All plants need water to survive, there are a few plants that with some food colouring you can add a different colour to the leaves. When this works, the plants look stunning. Below some images of the plants.

"How does it work?

As you probably noticed, most plants have a "drinking" problem. Okay, in this case it's a good problem. Most plants "drink" water from the ground through their roots. The water travels up the stem of the plant into the leaves and flowers where it makes food. When a flower is cut, it no longer has it's roots, but the stem of the flower still "drinks" up the water and provides it to the leaves and flowers.

Okay, now it's time to get technical. There are two things that combine to move water through plants -- TRANSPIRATION and COHESION. Water evaporating from the leaves, buds and petals (TRANSPIRATION) pulls water up the stem of the plant. This works in the same way as sucking on a straw. Water that evaporates from the leaves "pulls" other water behind it up to fill the space left by the evaporating water, but instead of your mouth providing the suction it is due to evaporating water. This can happen because water is very sticky--to itself (called water COHESION) and because the tubes in the plant stem are very small (in a part of the plant called the XYLEM). This process is called CAPILLARY ACTION.

Coloring the water with food coloring does not harm the plant in any way but allows you to see the movement of water through the roots to the shoots. Splitting the stem simply proves that the tiny tubes in the stem run all the way from the stem to the petals of the flowers. Our unofficial tests indicated that the blue dye went up the carnations the fastest followed by the red dye and then the green dye.

Like colored dyes in this experiment, some chemicals that pollute our waters can get into the soil and ground water and contaminate our vegetables and plants growing in the soil. Some chemicals and pollutants, just like the color dyes, may travel up into the plant and affect its health or growth."