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Question

Evelyn cut the stem of a white flower lengthwise. She put one side of the stem into a beaker of blue coloured water and the other side into a beaker of red coloured water. The stem was left overnight in the beakers. The next morning, Evelyn observed that the petals of half the flower turned blue and the other half turned red. Explain Evelyn’s observations.

Answer

According to Primary Science syllabus:

 

The  water -carrying tubes in the part of the stem put into the blue-coloured water transport the blue-coloured water to the flower. The water-carrying tubes in the part of the stem put into the red-coloured water transport the red-coloured water to the flower. 

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Here is my suggestion. Please do check with your science teacher when it is possible.

 

Transpiration happens when water evaporating from the leaves, buds and petals. It pulls water up the stem of the plant. Besides, due to the tiny tubes in the plant stem, water that evaporates from the leaves “pulls up” other water molecules behind to fill the space it left because of cohesion. This capillary action allows the split stems to send different coloured water to the petals of the flowers resulting in a half blue and half red flower.

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