Which of the following is not useful effect of GM plants? (i) Made crops more tolerant to abiotic stresses like cold, drought, salt, heat. (ii) Reduced reliance on chemical pesticides by forming pest-resistant crops. (iii) Helped to increase post-harvest losses. (iv) Increased mineral usage by plants so early exhaustion of fertility of soil occurs. (v) Enhanced nutritional value of food, e.g., vitamin A enriched rice. (vi) Create tailor-made plants to supply alternative resources to industries, in the form of starches, fuels and pharmaceuticals.