Explanation

[Solution from source] The formula shows an actinomorphic bisexual flower with five fused sepals, five fused petals, five epipetalous stamens and a bicarpellary syncarpous superior ovary, which is the Solanaceae formula (tobacco). Soybean and sunnhemp (Fabaceae) are zygomorphic with a monocarpellary pistil, and tulip (Liliaceae) has a trimerous perianth. Answer (3).