PRACTICAL

            PRACTICAL  WORK    

         

  HYDRILLA  EXPERIMENT

AIM

To demonstrate the  evolution  of    oxygen  during  photosynthesis.

MATERIALS REQUIRED

           Hydrilla plant , Funnel,Test tube , Beaker , Fresh water etc.

PROCEDURE

Insert the branches of hydrilla plant into the funnel keeping its cut end firmly introduced into the tube of the funnel. Invert the funnel and fully immerse it in water in the beaker with its stem directed upwards. Invert a test tube , filled with water, over the stem of the funnel keep the apparatus in sun light and observe the changes.

OBSERVATION

Air bubbles come continuously from the cut end of hydrilla plant and are collected out the top of the test tube by downward displacement of water. On testing the gas collected in the test tube is found to be oxygen. This experiment proves that oxygen is evolved during photosynthesis.

INFERENCE

From the experiment we arrive at the conclusion that the branches of hydrilla carry out photosynthesis and release oxgyen.

                                                                                                                   

                              SUBMITTED BY,

                    ARCHANA CHANDRAN A.C.

                    ROLL NO:5

NATURALSCIENCE