Step 1: Understanding the Concept:
Cultivated crops and ornamental plants have diverse propagation methods and economically useful plant parts.
Step 2: Detailed Explanation:
Let us establish the correct pairs between List I and List II:
A. African mustard (Brassica species): Propagated through and harvested for its Seed (III).
B. Black rose (Rosa species): Typically propagated commercially through stem Cutting or budding (IV).
C. Stone breaker (Phyllanthus niruri): An important medicinal herb where the extract of the Leaf contains key therapeutic compounds (II).
D. Saffron (Crocus sativus): Propagated via underground modified stems, often referred to under the broad category of corms or Bulb (I).
Therefore, the correct match is:
A-III, B-IV, C-II, D-I
Step 3: Final Answer:
This matching sequence is represented by option (D).