Step 1: Understanding the Concept:
Identifying specific cultivar names of temperate vegetable crops is essential for competitive agricultural exams. Step 2: Detailed Explanation:
"King of North" is a popular, high-yielding cultivar of Knol Khol (Brassica oleracea var. gongylodes).
It is well-suited for cultivation in colder northern climates, producing tender, high-quality swollen stems (knobs). Step 3: Final Answer:
Thus, King of North is a variety of Knol Khol.