Photosynthesis

Hello class :)


What do you think about photosynthesis?

As we know, photosynthesis is one of the most important activities for plants and photosynthetic organisms. 
It is a system of using photon, CO2 and H2O are transformed to C6H12O6 and O2 by photosynthesis. Their products are essential for animals and inspirational activities. 

The purpose of this experiment is to understand photosynthesis using plant’s leaves with following experiments: determining which colored pigment are most effective for photosynthesis, separation and identification of plant pigment, and determining the absorption spectrum for leaf pigments.


Let me explain about first one of some experiments for it.

In our group, we used 1000mL beaker where 300mL water were inside, placed 200mL of 80% ethyl alcohol with 400mL beaker. Make sure do not place the ethyl beaker directly on the hot plate. Used forceps, dropped leaves into boiling alcohol solution and wait until they got white.  Removed them from the beaker and rinsed with water well. Waited for 5 minutes after they were soaked with I2KI solution.

Color	Pigment	Starch Present (predicted)	Starch Present (Actual results)
Green	○	+	+
Purple	○	+	+
Pink	○	+	No result
White	○	-	-
Other (Black)	○	+	+

According to the result, since dark green area in a leaf contained most large amount of starch, those areas were most common for photosynthesis. On the other hand, light green and white pigments contained no starch, which means no photosynthesis occurred in those areas.