Monday, 8 August 2011

Answers for P6 Science Question

Here's the answer for the P6 Science Question we asked yesterday.

Answer: The white flower will have some patches of blue and red.

Explanation:  As we all know, most plants absorb 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 the flower is cut, it no longer has its roots, but the stem of the flower still absorb the water and provides it to the leaves and flowers.

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. This can happen because water sticks 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.

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.

**See the video for more the experiment**

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