Cohesion/transpiration pull theory of ascent of sap was proposed by

Options

A. Munch
B. Stephen Hales
C. Dixon and Joly
D. Bose

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks about the scientist who proposed the cohesion/transpiration pull theory of ascent of sap in plants.

2. **Defining the Theory:**
The cohesion/transpiration pull theory explains how water is transported from the roots to the leaves in plants. It involves the process of transpiration, where water evaporates from the leaf surface, creating a negative pressure (suction) that pulls water upward through the xylem.

3. **Identifying Key Contributors:**
The theory was initially proposed by two scientists, Dixon and Jolly, in 1894. They described how the suction pressure developed due to transpiration helps in the ascent of sap.

4. **Further Development:**
The theory was later refined by Dixon in 1914, which helped in establishing a more comprehensive understanding of the water transport mechanism in plants.

5. **Evaluating the Options:**
- **Munch**: Proposed the pressure flow hypothesis, not the transpiration pull theory.
- **Stephen Hales**: Known for his work on long-distance transport but not specifically for this theory.
- **Dixon and Jolly**: Correctly identified as the proposers of the cohesion/transpiration pull theory.
- **Jolly Boss**: This name seems to be a misrepresentation or confusion with Jolly.

6. **Conclusion:**
The correct answer to the question is **Dixon and Jolly** as they proposed the cohesion/transpiration pull theory of ascent of sap.

**Final Answer:**
The cohesion/transpiration pull theory of ascent of sap was proposed by **Dixon and Jolly**.

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