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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
Related Questions: - Genetic engineering has been successfully used for producing:
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Topics: Plant Physiology
(28)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Genetic engineering has been successfully used for producing:
- In a forest ecosystem fungi comes under
- Select the option which correctly matches the endocrine gland with its hormone
- Removal of proximal convoluted tubule from the nephron will result in:
- Low Ca⁺⁺ in the body fluid may be the cause of :
Topics: Plant Physiology (28)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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