Step 1: Understanding the Concept:
Indian states declare official symbols, such as state fruits, to promote regional agricultural identity and support local cultivation and marketing.
Step 2: Detailed Explanation:
- The 'Queen' pineapple is a spiny, early-maturing, extremely sweet cultivar with bright yellow flesh and a pleasant aroma.
- It is the primary pineapple variety grown in the northeastern state of Tripura.
- In June 2018, the President of India officially declared the 'Queen Pineapple' as the State Fruit of Tripura to promote its cultivation, domestic trade, and export.
Step 3: Final Answer:
The Queen pineapple is the state fruit of Tripura.