<P> Active absorption refers to the absorption of water by roots with the help of ATP , generated by the root respiration : as the root cells actively take part in the process , it is called active absorption . According to Renner , active absorption takes place in low transpiring and well - watered plants , and 4 % of total water absorption is carried out in this process . The active absorption is carried out by two theories ; active osmotic water absorption and Active non-osmotic water absorption . In this process energy is required . </P>
active absorption of water from the soil by the root is mainly affected by
ATP