Factors responsible for ascent of sap
Answers
Answer:
Cappilarity- Due to the force of cohesion, capillaries have low level of water. ...
- Root pressure- Root pressure pushed sap from below due to active absorption by roots.
- Transpiration – Transpiration is evaporation of water and it affects sap in a way that constant transpiration brings the sap under negative pressure..
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Answer:
FACTORS RESPONSIBLE FOR ASCENT OF SAP:
1. Capillarity- It is the limited rise of water in narrow tubes or capillaries due to forces of cohesion amongst the molecules of water and their property of adhesion to other substances.
2. Imbibition- It is the ability of hydrophilic colloid to attract and hold water on the surface and inside their interspaces.
3. Root pressure- It is the positive pressure that pushes sap from below due to active absorption by roots.
4. Transpiration pull- Transpiration in aerial parts brings the xylem sap under negative pressure or tension due to the continuous withdrawal of water by them. Water column does not break due to its high tensile strength related to high force of cohesion and adhesion.