Today we will demonstrate how transpiration takes place in plants.
Transpiration is the process of removal or excretion of excess water from the plants.
This normally happens through the stomata on the leaves. Transpiration helps in getting rid of excess water and also helps it to stay cool.
For this experiment we need 2 glasses, a small plant with some leaves and root, vaseline, plasticine / play dough, water, a piece of cardboard with a hole through which we can suspend the plant.
We first insert the roots of the plant into the hole which is just big enough to allow the roots to pass through it.
Next we seal the plant on to the hole with the help of plasticine / dough.
We put water in one of the glasses and apply vaseline on its rim so that the cardboard which we will put on it, seals the air in the glass.
Next we suspend the plant (coming out of the cardboard) on to the glass so that the cardboard rests firmly on the glass and its root dip in the water below.
Next we apply vaseline on to the other glass and invert it above the cardboard, so that shoot of the plant is trapped in this second glass.
We place these glasses near a window where there is light or sunshine.
OBSERVATION:- After a few hours we observe tiny droplets of water sticking on to the glass on the top.
This is because some of the water which is entering the plant through the root gets excreted out of the plant leaves through transpiration. Since, the glass has trapped the plant hence, the water which is lost sticks on to the walls of the glass.
https://www.youtube.com/watch?v=NPuGjQtZwQA