Water drops present on leaf margins of Tropaeolum, Balsam and grasses in early morning are due to

Options

A. Guttation
B. Dew
C. Osmosis
D. Transpiration .

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks why there are water drops on the leaf margins of certain plants (Tropaeolum, Balsam, and grasses) in the early morning.

2. **Identifying the Process**: The phenomenon described is known as gutation. Gutation is the process by which plants exude water droplets from their leaf margins.

3. **Conditions for Gutation**: Gutation typically occurs when the transpiration rate is low. This often happens during the night or early morning when the air is cooler and more humid, reducing the evaporation of water from the leaves.

4. **Role of Root Pressure**: During gutation, root pressure plays a crucial role. When the plant absorbs water from the soil, it creates pressure in the roots, which can push water up through the plant and out through specialized structures at the leaf margins called hydathodes.

5. **Distinguishing Gutation from Other Processes**: It is important to differentiate gutation from dew and transpiration. Dew forms from moisture in the air condensing on the plant surface, while transpiration involves the loss of water vapor through stomata.

6. **Conclusion**: Therefore, the water droplets observed on the leaf margins of the mentioned plants in the early morning are due to the process of gutation.

**Final Answer**: The water drops present on leaf margins of Tropaeolum, Balsam, and grasses in early morning are due to gutation.

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