wiz-icon
MyQuestionIcon
MyQuestionIcon
2
You visited us 2 times! Enjoying our articles? Unlock Full Access!
Question

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap, because of

A
Lignified thick walls.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Cohesion and adhesion.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Weak gravitational pull.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Transpiration pull.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B Cohesion and adhesion.
The ascent of sap is the mechanism by which water moves from the roots to the top of the trees. Studies on the process of ascent of sap show that the strong cohesive force between the water molecules(cohesion), the attraction between water molecules and the wall of the xylem elements (adhesion) and the transpiration pull creates a tension on the water column, which ensures continuity of water column in plants. Thus, rupture and fractionation of the stressed water columns known as cavitation which tends to block the flow of sap does not take place in the water column, because the continuity of water column is maintained by cohesion and adhesion.
So, the correct answer is option B.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Uptake and Transport of Mineral Nutrients
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon