Last Lab Sesion

It was our last lab session for the term and we did 2 experiments, one of it was testing for starch on a leaf and the other was the use of visking tubing. 

 The pictures below shows the experiment of testing for starch on a leaf.
The picture on the top right shows the leaves in a hot water bath of ethanol.
At the top left the picture shows the leaf after being tested for starch with iodine. As shown, the green part of the leaf turns the iodine while the yellow part of the leaves make the iodine remains brownish- yellow.

The pictures above shows the ethanol after a leaf is being soaked in it. The ethanol turned green because of the chlorophyll in the leaf.
The steps for this experiment are as below:

1. Boil the leaf to break the structure of the leaf cells
2. Place the leaf in ethanol and place the ethanol in a hot water bath
3. Add a few drops of iodine on the leaf

From This experiment i learnt that for a leaf to photosynthsis it requires chlorophyll and chlorophyll can only be found in the area of the leaf.

The next post will show the other experiment about the visking tubing