What is wrong about Solanaceae?
(a) Swollen axile placentation
(b) Bicarpellary superior ovary
(c) Monocarpellary superior ovary
(d) Epipetalous stamen

Hint: Solanaceae are a potato family, which bear pentamerous flowers. It produces annually to biennial plant use for multiple purposes. The plant belongs to this family is generally shrubs and herbs but in some species, it forms trees.

Complete answer:
Solanaceae belongs to the division Spermatophyta of the angiosperm family. It is a dicot plant with 2000 species. It has a tap root system with a woody herbaceous stem containing bicollateral vascular bundles. Gynoecium of Solanaceae is bicarpellary, syncarpous, placentation axile, and swollen. Stamen is Epipetalous with dithecous anther. The fruit is in the form of a berry and capsule and the seed is endospermic.

Additional Information: The plants belonging to Solanaceae are potato, brinjal, tomato, capsicum, chilies, and raspberry are the source of food. Some medicinal plants include belladonna, atropine, datura, asgandh hand, and kateli. Ornamental plants include Raat ki rani and miscellaneous plants include tobacco and some species of datura which is used as weeds.
A monocarpellary superior ovary is the characteristic feature of the family Fabaceae, it shows marginal placentation with dithecous anther. Flowers are bracteate, pentamerous, and hypogynous. Seeds are non-endospermic with fruit in the form of legume. It includes all leguminous plants with a medicinal plant like red clover, liquorice, dhak, timber yielding plant-like shisham, dies yielding plant-like indigo, and ornamental plants like sweet pea, Lupinus, and Clitora.
Tricarpellary superior ovary is a characteristic feature of the family Liliaceae. Gynoecium also shows axile placentation with epiphyllous stamen. Fruits are in the form of capsules and berry with monocot seeds. This family is also known as a lily family that consists of a plant of onion, garlic, and Shatavari as a vegetable. Medicinal plant-like aloe vera and saffron. Ornamentals plants are Asparagus, Ruscus, Yucca, Tulips, Gloriosa, Lilies, and Smilax.
So, the correct answer is ‘Monocarpellary superior ovary’.

Note: Bicarpellary superior ovary is also a characteristic feature of family Malvaceae with axile placentation and epipetalous stamen. The Malvaceae family is also known as the cotton family. The characteristic feature of this plant includes mucilage cells and plant leaves with hairy outgrowth.