What is bagging technique? How is it useful in a plant breeding programme?

Explanation

### Step-by-Step Solution:

1. **Definition of Bagging Technique**:
- The bagging technique is a method used in plant breeding where the stigma of a flower is covered with a bag (usually made of polybag or butter paper) to prevent unwanted pollen from fertilizing it.

2. **Purpose of Bagging**:
- The primary purpose of bagging is to prevent fertilization by undesired pollen grains. This is particularly important in ensuring that the plant breeding process is controlled and that only specific traits are passed on.

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