NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Botany
- Chapter
- Transport in Plants
NTA Abhyas 2020 · Botany · Transport in Plants
Transpiration has more than one purpose. Which of the following is...
Transpiration has more than one purpose. Which of the following is not the purpose of transpiration?
Options
- ACreates transpiration pull for absorption and transport in plants.
- BCools leaf surfaces by evaporative cooling.
- CTransports minerals from the soil to all parts of the plant.
- DGives high tensile strength to water column present in xylem.
Correct answer
D. Gives high tensile strength to water column present in xylem.
Step-by-step solution
Transpiration creates a transpiration pull which causes ascent of sap. The cohesive and adhesive properties of water molecules forms the unbroken continuous water column in the xylem. The water molecules are held together by strong cohesion force due to hydrogen bonds and the force of adhesion which holds water to the walls of xylem vessels. The surface tension accounts for high capillarity through tracheids and vessels.&