Which of the following describes the Cohesion-Tension Theory in plants?

Question

BlackTom AI · Accepted Answer

To analyze the Cohesion-Tension Theory in plants, I’ll evaluate what each option suggests about how water moves.
Option a states: 'Tension placed on water by evaporation at a plant's surface pulls a constant stream of water from the soil.' This aligns with the core idea of the Cohesion-Tension Theory: water is evaporated (transpired) from leaf surfaces, creating a negative tension that pulls water upward through the xylem from the soil to the leaves. The cohesion between water molecules helps transmit this pull all the way down the column of water in the xylem, enabling continuous ascent.
Option b asserts: 'Tension placed on water by evaporation at a plant's surface pulls a constant stream of water from the leaves.' While evaporation occurs at the leaves, the theory describes water moving upward from the soil, not being pulled from the leaves themselves, so this wording misplaces the source of water.
Option c claims: 'Tension placed on water by condensation at a plant's surface pulls a constant stream of water from the soil.' Condensation is not the driving force in this theory; the process relies on evaporation (transpiration) creating tension, not condensation.
Option d suggests: 'Tension placed on water by evaporation at a plant's surface pulls a constant stream of water from the atmosphere.' The water is drawn from the soil and transported through the plant; it does not pull water from the atmosphere, so this option misidentifies the source reservoir of water in the pull.
In summary, option a correctly describes the upward movement of water driven by evaporation-induced tension transmitting from leaves down through the soil-to-plant water column, while the other choices misstate where the water is pulled from or the process mechanism.

Which of the following describes the Cohesion-Tension Theory in plants?单项选择题

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