DPD is also known as ……………………………..

Explanation

**Step-by-Step Solution:**

1. **Understanding DPD**: DPD stands for Diffusion Pressure Deficit. It is a term used in plant physiology to describe the pressure difference that drives the movement of water in plants.

2. **Definition**: The Diffusion Pressure Deficit (DPD) can be defined as the difference in pressure between pure water and a solution. This concept helps in understanding how water moves from areas of high concentration (pure water) to areas of low concentration (solution).

3. **Mathematical Representation**: DPD can be expressed mathematically as:
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