Name the scientists who have contributed to the following:
Classified active and passive absorption of water by roots.

Explanation

**Step-by-Step Solution:**

1. **Understanding Absorption of Water by Roots:**
- Water absorption in plants can occur through two main processes: passive absorption and active absorption.
- Passive absorption occurs when water moves from an area of higher concentration to an area of lower concentration without the expenditure of energy. This process relies on the natural movement of water due to concentration gradients.

2. **Defining Active Absorption:**
- Active absorption, on the other hand, requires energy (usually in the form of ATP) to move water against the concentration gradient. This means that water is absorbed from an area of lower concentration to an area of higher concentration.
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