In some plants, fruits develop without fertilization because the placental tissue of unfertilized ovary produces

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Parthenocarpy is the development of fruit without fertilization. In some plants, the placental tissue of the unfertilized ovary produces auxins, which stimulate the ovary to enlarge and develop into a seedless fruit. Application of synthetic auxins can also induce parthenocarpy in plants like tomatoes. Answer: Auxins