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?

查看解析

登录即可查看完整答案

类似问题

In a plant, water travels from the roots to the leaves by which process?

Tree height is limited because the upward movement of water via evaporation from the leaves and water pressure from the roots competes with .

Tissue-level water transport in plants occurs in three forms: transport, transport, and transport.

Recent droughts have caused the tops of quite a few western redcedar trees to die around here. This tree is outside my house (and seems to be a favourite spot for a turkey vulture). Why do you think drought causes trees to die at the top rather than the bottom? (Pick the best answer.)

Which statements are true about water movement in plants? Select 2 answers.

How does water move in the soil, plant, and atmosphere continuum? Choose 2 answers.

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单