Me: mr wan, if you put a plant in blue dye, then put in clean water, will the stem still have blue colour?

and water is used to photosynthesise, so if it uses blue dye, will the food be blue too?

if it won't, what will happen to the blue dye then? will it escape through the stomata?

Mr Allan Wan: First of all, you won't really see the stem change colour as water carrying tube are inside the stem, not outside

usually the leaves and flowers change colour

if the plant absorbs more plain water, i guess the blue just becomes lighter and lighter

colour won't escape from stomata, only water and gases. The colour simply becomes lighter over time.

Me: why?

so do you mean that the leaves only take the clean water and not the blue coloured dye for photosynthesis?

Mr Allan Wan: Nope, the blue just gets paler and paler as it mixes with more clear water

Me: ohh.. but will it disappear totally?

Mr Allan Wan: It's more of diluted. Like a sweet drink, if you add more plain water, it gets less sweet but it doesn't mean the sugar disappears

Me: ooh... but the water is used up, not the blue dye

Mr Allan Wan: water mixes with the blue until the blue becomes diluted and no longer visible

That is the questions that I remember. Sorry, my memory is not good.

Michelle

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