The cohesive-tension hypothesis is a theory of intermolecular attraction. This explains the process of flow of water against the gravity force upward to the plants through the xylem. During night time, the water evaporating to the stomata creates a negative pressure or tension that pulls the water column up the plant.

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Chapter 36, Problem 13TYK

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Introduction: The cohesive-tension hypothesis is a theory of intermolecular attraction. This explains the process of flow of water against the gravity force upward to the plants through the xylem. During night time, the water evaporating to the stomata creates a negative pressure or tension that pulls the water column up the plant.

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Which of the following statements is inaccurate?a. Water that evaporates from leaves is ultimately replaced by water diffusing from the xylem.b. Xylem transports water up the plant while phloem transports carbohydrates throughout the plant.c. Water movement in the xylem is largely due to the pressure-flow hypothesis.d. Water movement across membranes is often due to differences in solute concentrations.

Water movement through the xylem needs less pressure than movement through living cells. A. Agree, because water moves in xylem through diffusion. B. Disagree, because water needs turgor pressure in order to diffuse. D. Disagree, beacuse both need equal pressure for materials to pass through xylem and living cells like sievetubes. C. Agree, because water is non-living while photosynthates are living and must pass through living cells that require pressure.

According to the pressure-flow model, sugar is actively transported into phloem anda. enters xylem, where it is moved toward the leaves due to transpiration.b. creates pressure to move water toward the roots.c. is transported out of the leaves through stomata.d. water follows by osmosis, providing pressure that moves the water and sugar through the phloem.