Diseases resistance is obtained through

Options

A. Colchicine treatment
B. Crossing with wild relatives
C. X-ray treatment
D. Hormone treatment

Answer

**Step-by-Step Solution:**

1. **Understanding Disease Resistance**: Disease resistance in crops refers to the ability of a plant to prevent or withstand diseases caused by pathogens such as fungi, bacteria, and viruses.

2. **Exploring Options**: We are given four options to consider for obtaining disease resistance:
- Option 1: Colchicine treatment
- Option 2: Crossing with wild varieties
- Option 3: X-ray treatment
- Option 4: Hormone treatment

3. **Analyzing Each Option**:
- **Colchicine Treatment**: This method is primarily used for inducing polyploidy in plants, which can lead to increased size and vigor but does not directly confer disease resistance.
- **Crossing with Wild Varieties**: This involves hybridizing cultivated crops with their wild relatives. Wild varieties often possess traits that have evolved to resist diseases, pests, and environmental stresses. By crossing with these wild relatives, the desirable traits can be transferred to the cultivated crops, enhancing their disease resistance.
- **X-ray Treatment**: This method is used for inducing mutations in plants. While it can lead to new traits, it is not a reliable method for specifically obtaining disease resistance.
- **Hormone Treatment**: This involves the application of plant hormones to influence growth and development. It does not directly confer disease resistance.

4. **Conclusion**: The most effective and recognized method for obtaining disease resistance in crops is through **crossing with wild varieties**. This method leverages the natural resistance traits found in wild relatives of cultivated crops.

5. **Final Answer**: Therefore, the correct option for obtaining disease resistance is **Option 2: Crossing with wild varieties**.

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