Ringing (girdling) experiment cannot be performed in

Options

A. Sugarcane
B. Mango
C. Indian rubber plant
D. Tectona

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Ringing (Girdling) Experiment**: The ringing or girdling experiment involves removing a ring of bark from a plant. This bark includes all tissues exterior to the vascular cambium, which consists of cork, phloem, and other layers. The purpose of this experiment is to observe the effects of removing the phloem, which is responsible for transporting food in the plant.

2. **Identifying Plant Types**: Plants can be classified into two main categories: dicots and monocots. In dicots, the vascular bundles are arranged in a ring, allowing for the removal of a ring of bark. In contrast, monocots have scattered vascular bundles, which makes it impossible to perform the girdling experiment effectively.

3. **Effects of Girdling**: When the bark is removed, the portion of the plant above the girdled area will swell due to the accumulation of food that cannot be transported downwards. This swelling indicates that the food transport mechanism has been disrupted.

4. **Historical Context**: The experiment was first conducted by Malpighi, who aimed to understand the movement of food within plants. It was later confirmed that the phloem is responsible for this transport, and it is primarily unidirectional.

5. **Determining the Inapplicable Plants**: Since girdling can only be performed in dicots due to their vascular structure, we need to identify a monocot from the provided options.

6. **Analyzing the Options**: The question provides several plant options, including sugarcane, mango, Indian rubber plant, and Tectona. Among these, sugarcane is a monocot, while the others are dicots.

7. **Conclusion**: Based on the classification of the plants, the ringing (girdling) experiment cannot be performed in sugarcane, which is the correct answer.

**Final Answer**: The ringing (girdling) experiment cannot be performed in **sugarcane**.

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