Which statement describes how water is pulled up through the xylem to the leaves of the plant?
Understand the Problem
The question is asking which statement correctly explains the mechanism of water movement from the roots to the leaves in plants through the xylem, based on the provided figure and information about evaporation and hydrogen bonding.
Answer
A
The final answer is (A) As water exits the leaf, hydrogen bonding between water molecules pulls more water up from below.
Answer for screen readers
The final answer is (A) As water exits the leaf, hydrogen bonding between water molecules pulls more water up from below.
More Information
Water is pulled up through the xylem primarily via the process of transpiration. The loss of water vapor from the leaves (transpiration) creates a negative pressure that pulls water up through the plant. Cohesion between water molecules due to hydrogen bonding and adhesion to the walls of the xylem cells further facilitate this upward movement.
Tips
A common mistake is to confuse the role of the roots in signaling or ‘pumping’ water upwards. In reality, it's the physical properties of water and the process of transpiration that drive this movement, not direct signals or pump mechanisms from the roots.
Sources
- The web page with info on - Example Source - brainly.com
- Water Uptake and Transport in Vascular Plants - Nature - nature.com
- Water Transport in Plants: Xylem | Organismal Biology - Georgia Tech - organismalbio.biosci.gatech.edu
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