Ascent of sap in absense of roots was observed by

Options

A. J.C Bose
B. Piestley
C. Strassburger
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding the Ascent of Sap**: The ascent of sap refers to the movement of water and nutrients from the roots of a plant to its leaves and other parts, moving against the force of gravity.

2. **Role of Roots**: Roots are primarily responsible for absorbing water and nutrients from the soil. They do not require the process of sap ascent since they are already in contact with the water source.

3. **Root Pressure**: Instead of ascent, roots generate root pressure, which is the pressure created by the osmotic movement of water into the roots. This pressure helps in pushing water upwards through the xylem.

4. **Historical Observations**: The question asks for the scientist who observed the ascent of sap in the absence of roots. This observation is crucial for understanding how plants can still transport water and nutrients even when roots are not functioning.

5. **Identifying the Scientist**: The scientist who is credited with observing the absence of sap ascent in roots is Strasburger. He conducted his research in 1940 and provided insights into the mechanisms of sap ascent.

6. **Conclusion**: Therefore, the correct answer to the question is that the ascent of sap in the absence of roots was observed by Strasburger.

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