Step 1: Understanding the Question:
This question tests knowledge of nursery techniques and their application to crops.
Step 2: Detailed Explanation:
Mat nursery is a technique used in rice cultivation.
It involves growing rice seedlings on a mat (using soil or organic matter) for mechanical transplanting.
This method is used in the System of Rice Intensification (SRI) and mechanical transplanting.
Onion (A): Grown from bulbs or seeds in nursery, but not mat nursery.
Tobacco (C): Grown in nursery beds, not mat nursery.
Chillies (D): Grown in nursery beds.
Thus, mat nursery is related to rice.
Step 3: Final Answer:
Thus, mat nursery is related to rice, which corresponds to option (B).
[0.5cm]