How much of water is passively absorbed by the plant?

Water absorption in plants occurs through two main mechanisms: active absorption and passive absorption.

Passive absorption is driven by the transpiration pull created in the aerial parts of the plant, which pulls water upward through the xylem. This process does not require metabolic energy.

Approximately $98\%$ of the total water absorbed by a plant is taken up passively, while active absorption accounts for only about $2\%$ to $4\%$.

Answer: $98\%$