Step 1: Understanding the types of cuttings used for plant propagation:
- Stem cutting: A method used to propagate plants like blackberry (Column II - a).
- Leaf cutting: A method commonly used for plants like rose (Column II - b).
- Root cutting: A technique used for plants like sansevieria (Column II - c).
Step 2: The correct matches are:
1. Stem cutting → Blackberry
2. Leaf cutting → Rose
3. Root cutting → Sansevieria
Conclusion: The correct answer is \( 1-b, 2-a, 3-c \).