Question

Statement A: Transpiration creates pressure in xylem sufficient enough to transport water up to 130 m high. Statement B: Transpiration creates a pushing force.

• A. Both the statements are true
• B. Both the statements are false
• C. Statement A is true but Statement B is false
• D. Statement B is true but Statement A is false

Answer 1

Answer:

C. Statement A is true but Statement B is false

• Transpiration is the loss of water in the gaseous phase from the leaves.

• It is a necessary evil. It might be a major cause of loss of water but it is the driving force for ascent of xylem sap, therefore, conduction of water and minerals.

• It creates pressure in xylem which can allow water conduction up to 130m height.

• Transpiration is a pulling force while root pressure is a pushing force.