When a plant first begins to wilt permanently in a pot, its 54.5 gm of soil has 4.5 gm of water. The Permanent Wilting Point (PWP) of this soil is:

a) 4.5%
b) 9%
c) 8.25%
d) 16.5%

Dear student,
Please find below the solution to the asked query

The correct option is b).
The minimal point of soil water required by plant not to wilt is called permanent wilting point (PWP). It can be determined as:

Mass of soil with water = 54.5gm
Mass of water = 4.5gm
Therefore, mass of dry soil = 54.5-4.5 = 50gm

​PWP or Moisture content = Mass of waterMass of dry soilx100= 4.550x100 = 9%.

Hope this information will clear your doubts about the 
​​permanent wilting point (
PWP)​.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.
Regards 

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PWP =  (mass of  water / mass of soil without water ) x 100
PWP = ( 4.5 / 54.5-4.5 ) x 100 = 9%
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