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The repture and fractionation do not usually occur in the water column in vessel / tracheids during the ascent of sap because of
Options
(a) lignified thick walls
(b) cohension and adhesion
(c) weak gravitational pull
(d) transpiration pull
Correct Answer:
cohension and adhesion
Explanation:
The repture and fractionation do not usually occur in the water column in vessel / tracheids during the ascent of sap because of cohension and tension. The water molecules have a great mutual attraction with each other or in other words we can say that they have tremendous cohesive power which is sometimes as much as 350 atmospheres. Thus, the transpiration pull develops a negative pressure in the uppermost xylem cells. It is transmitted from there into the xylem of stems, and from there into the xylem of s
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Topics: Plant Physiology
(28)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In angiosperms, which of the following part is triploid?
- To obtain virus- free healthy plants from a diseased one by tissue culture technique,
- A yellow substance oozing out from wound has
- Greatest problem in water conservation is to reduce the amount of
- Which was the first national park established in India?
Topics: Plant Physiology (28)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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