Answers to Hands-on Pg 4-5

Aim : To study the role of root pressure in the movement of water

Set	Initial water level (cm)	Final water level (cm)	Increase in water level (cm)
Treatment	2	23.5	21.5
Control	2	2.0	0.0

Discussion :

1. The treatment set shows an increase of 21.5cm of water column in the capillary tube whereas there is no increase in water column of the control set.
2. The rise in the water column is caused by a force pushing the water up the stem from the roots. This force is called root pressure.
3. Osmosis

Conclusion :

Water is pushed from the roots up the stem by a force called root pressure