Tuesday, October 9, 2012
Stomata and Photosynthesis in Plants at National Science Centre 12 September 2012
A simple experiment to show plant's photosynthesis.
Bromothymol blue(BTB) was used as an indicator. By using a straw, blow CO2 into BTB solution, to make it more acidic. BTB will change to yellow colour. Then, by putting waterweed into the chemical solution, the plant will utilize the CO2 in the process of photosynthesis, making BTB solution less acidic and the colour will return to blue.
And this is a stomata specimen on a slide.
It was taken by applying a thin layer of clear nail polish on the back of a leaf. Peel it off when it has dried.