Question

Water raises in the xylem tubes due to ____________​

Answer 1

Answer:

Water raises in the xylem tubes due to  the force of surface tension. ... Thus water moves from the roots to all other parts due to capillary action and the pull created due to evaporation of water from the leaves.

Explanation:

Answer 2

Answer:

The lumen of tracheids and vessels of a xylem link to form a narrow tube and water rises in the narrow tube due to the force of surface tension. This phenomenon is known as capillarity.

Explanation:

Water tends to rise up inside the narrow tubes by capillary action. This is because of an attraction of water molecules to each other by a week electrostatic force. This is called the cohesive force the water molecules are also attracted to the wall of a glass capillary tube which is similar to the inside of the xylem vessel. Because of this, water rises up in the xylem vessel to some distance up dragging other water molecules present below them. This capillary rise cannot take up water to tall plants though this may be possible in very small plants.