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

Question

BlackTom AI · Accepted Answer

Consider the question: how does water move upward from roots to leaves in a plant?
Option 1: capillary action. Capillary action refers to the movement of liquid within narrow spaces due to adhesion to the surrounding surfaces and cohesion within the liquid. In plants, this mechanism helps water rise in tiny spaces and contributes to upward movement alongside other processes, making this option a plausible and commonly cited description of how water can travel through small conduits.
Option 2: osmosis. Osmosis is the net diffusion of water across a selectively permeable membrane from a region of higher water potential to lower water potential. While osmosis is essential at the cellular level for water balance, the bulk transport of water from roots to leaves through the plant’s vascular system cannot be fully explained by osmosis alone, since it involves movement through xylem vessels and is driven by transpiration and cohesive–adhesive forces, not simply by membrane water diffusion.
Option 3: gravitational forces. Gravitational forces act downward and would oppose upward movement of water in trees and other tall plants. Although gravity is a factor that must be overcome in tall plants, it is not the primary driving mechanism for the ascent of water from roots to leaves, so attributing the process mainly to gravity is incorrect.
Option 4: hydrostatic pressure difference. Hydrostatic pressure can influence fluid movement in some contexts, but in the plant’s xylem, the upward transport is driven largely by transpiration-induced tension (negative pressure) and cohesive–adhesive interactions, rather than a simple hydrostatic pressure difference pushing water upward. Therefore this option does not accurately describe the main mechanism.
In summary, option 1 best aligns with the concept of water rising through narrow channels by adhesion to surfaces and cohesion within the water, consistent with capillary action, while the other options either describe imperfect or incomplete explanations or point to mechanisms not primarily responsible for upward water transport in plants.

In a plant, water travels from the roots to the leaves by which process?单项选择题

类似问题

The correct path of water from soil to atmosphere is:

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

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.

Question at position 8 An excess of growth hormone (GH) before puberty can result in the development ofgigantism.Graves' disease.acromegaly.pituitary dwarfism.Clear my selection

更多留学生实用工具

智能学习助手

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