Write one word for the following:
The pressure that leads to pushing up of xylem sap.

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Solution

Root pressure.
The transverse osmotic pressure within the cells of a root system causes sap to rise through a plant stem to the leaves, which is known as root pressure.
When the soil moisture level is high at night or when transpiration is low during the day, root pressure occurs in the xylem of several vascular plants.

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Give biological reason for the following:

Development of negative pressure in xylem sap.

The ascent of xylem sap depends on _______.

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