Name the causative micro - organisms of the following plant diseases :
Yellow vein mosaic of bhindi (Okra)

Explanation

**Step-by-Step Solution:**

1. **Identify the Plant Disease**: The disease in question is the Yellow Vein Mosaic of Bhindi (Okra).

2. **Understand the Symptoms**: The disease causes the sap of the plant to turn yellowish, leading to early senescence (aging) of the plant. This affects the growth and market value of the plant.

3. **Determine the Causative Micro-organism**: The causative agent of Yellow Vein Mosaic is a virus.

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