Step 1: Understanding the Concept:
Correlating agricultural crops with their characteristic agro-techniques, major weed flora, physiological phenomena, and famous commercial cultivars.
Step 2: Detailed Explanation:
Evaluating the associations in List I:
- A. Wheat: Phalaris minor (II), also known as canary grass or 'Mandoosi', is the most troublesome grassy weed in wheat.
- B. Rice: Beushening (I), a traditional wet cross-ploughing and laddering practice in direct-seeded lowland rice for weed control and thinning.
- C. Mango: Alphonso (IV), the world-famous commercial mango cultivar of Maharashtra.
- D. Groundnut: Pegging (III), the physiological process where fertilized gynophores (pegs) elongate and push downward into the soil to form pods.
Matching sequence: A-II, B-I, C-IV, D-III.
Step 3: Final Answer:
Therefore, the correct matching is A-II, B-I, C-IV, D-III, corresponding to option (B).