Which one of the following type of auxins produced in the placental tissue of the unfertilized ovary causes parthenocarpy in pineapple, and banana?

Step-by-step solution

Parthenocarpy is the development of fruit without fertilization, resulting in seedless fruits. In plants like pineapple and banana, this process occurs naturally due to the endogenous production of auxins in the placental tissue of the unfertilized ovary. Among the given options, Indole-3-acetic acid (IAA) is the primary naturally occurring auxin in plants responsible for inducing natural parthenocarpy. NAA and 2,4-D are synthetic auxins, while IBA is also found naturally but IAA is the most abundant and principal