Step 1: Understanding the Concept:
Identifying crop cultivars is a standard botanical and horticultural topic.
Aonla (Indian Gooseberry, Phyllanthus emblica) is a widely cultivated medicinal fruit tree in India, famous for its exceptionally high vitamin C content.
Step 2: Detailed Explanation:
Let us analyze the varieties listed:
1. Narendra-7 (Aonla-7) (A): An improved cultivar of Aonla developed by Narendra Deva University of Agriculture and Technology, Faizabad, highly valued for its productivity and processing quality.
2. Kanchan (Aonla-4) (B): A famous commercial cultivar of Aonla, selected from the wild, known for its heavy bearing habit and high fiber content.
3. Banarasi (C): A classic, early-maturing, large-fruited variety of Aonla, widely preferred for making preserves (murabba).
4. Sultana (D): This is not a variety of Aonla. Sultana is a world-famous, seedless white Grape cultivar (Vitis vinifera) extensively dried to produce sweet golden raisins.
Therefore, Sultana is the correct odd-one-out.
Step 3: Final Answer:
Therefore, Sultana is not a variety of aonla.