This plant is ideal to demonstrate ascent of sap

Options

A. Rose plant
B. Balsam plant
C. Coconut plant
D. Cucumber plant

Answer

### Step-by-Step Solution:

1. **Understanding Ascent of Sap**:
- The ascent of sap refers to the movement of water and dissolved nutrients from the roots of a plant to its upper parts, such as leaves and stems. This process primarily occurs through specialized tissues known as xylem.

2. **Identifying the Process**:
- The ascent of sap occurs through xylem vessels, which are designed to transport water. The rate of ascent is typically around 10 to 15 centimeters per minute.

3. **Historical Context**:
- The phenomenon of sap ascent has been studied by various scientists, including Malpighi (1672), Stephen Hales (1727), and Hartig (1837). Their experiments helped in understanding how water moves through plants.

4. **Demonstration Methods**:
- The ascent of sap can be demonstrated through specific experiments. One common method is the ringing experiment, where a ring of bark is removed from a stem, allowing observation of sap movement.
- Another method involves dipping the cut end of a fresh shoot into a colored solution, such as a 2% eosin solution.

5. **Choosing the Right Plant**:
- Among the options given (rose plant, balsam plant, coconut plant, cucumber plant), the balsam plant is particularly suitable for demonstrating the ascent of sap due to its responsiveness to the colored solution.

6. **Conducting the Experiment**:
- For the balsam plant, if the cut end is dipped in the eosin solution for about 30 minutes, the xylem vessels will absorb the solution, causing the veins of the leaves to turn red. This visual change confirms the movement of sap.

7. **Conclusion**:
- Based on the above information and the experimental method, the ideal plant to demonstrate the ascent of sap is the **balsam plant**.

### Final Answer:
The plant that is ideal to demonstrate the ascent of sap is the **balsam plant**.

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