Detailed Explanation:

✅ Statement 1 – Correct: Drought-resistant crops like drought-tolerant maize and water-efficient rice have been developed by introducing genes that enable water conservation and stress tolerance.

✅ Statement 2 – Correct: Golden Rice (fortified with Vitamin A), iron-biofortified crops, and protein-enhanced legumes demonstrate increased nutritive value through genetic engineering.

❌ Statement 3 – Incorrect: Growing plants in spaceships and space stations relies on controlled environment agriculture, not genetic engineering; NASA experiments use conventional plant varieties adapted through breeding, not GM technology.

✅ Statement 4 – Correct: Flavr Savr tomato (first GM food approved in 1994) and other crops have been engineered with delayed ripening genes to increase shelf life and reduce post-harvest losses.