Question

Which pressure developed in the root, forces the water into xylem vessel and upwards into the stem for a certain height?

• A. Osmotic pressure
• B. Root pressure
• C. Atmospheric pressure
• D. Turgor pressure

Answer 1

Answer: (B)

Root pressure

The pressure with which water is pushed into the xylem tubes of the root is called as root pressure. The water moving upwards forms a column, which is maintained up to a certain height due to root pressure.

In tall trees, trees, this type of absorption plays a minor role in transporting water. This process is slow, and it cannot make up for the water lost by transpiration (the evaporation of water from the leaves). Transpiration is rapid during the day.

The loss of water due to transpiration creates a suction force that pulls water up through the xylem vessels. This transpiration pull serves as the main force that transports water through the xylem. Root pressure helps in the transport of water at night.

So, the correct answer is option B.