PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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lignin forms an incomplete secondary wall
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new vessels carry extra water as plants grow
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there are no cross walls between vessel elements
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the vessel elements form a narrow tube
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Detailed explanation-1: -Answer and Explanation: Water cohesion in xylem vessels is promoted by d. the vessel elements forming narrow tubes.
Detailed explanation-2: -In the case of xylem, adhesion occurs between water molecules and the molecules of the xylem cell walls. Cohesion, which is molecular attraction between “like” molecules. In water, cohesion occurs due to hydrogen bonding between water molecules.
Detailed explanation-3: -Transpiration creates a force that pulls on the water upward through the xylem, and water molecules pull other water molecules with them. Since they are attracted to the sides of the xylem, adhesion makes them travel up the sides of the vessels.
Detailed explanation-4: -Because their presence is thought to be an adaptation to drought, and because narrow vessels are likely more resistant to embolism than wide ones (Cai and Tyree 2010, Jacobsen et al.
Detailed explanation-5: -The xylem tracheary elements consist of cells known as tracheids and vessel members, both of which are typically narrow, hollow, and elongated.