Question

Transversely placed syncarpous ovary occurs in
A. Compositae
B. Cruciferae
C. Malvaceae
D. Cucurbitaceae

Answer 1

Hint: Cruciferae (Brassicaceae) has a gynoecium consisting of two carpels placed transversely syncarpous. The family Cruciferae has following characteristic features of gynoecium: Bicarpellary, syncarpous, transversely placed ovary, parietal placentation, and unilocular ovary with false septum called replum.

Complete answer: Option A:
Asteraceae or Compositae also known as aster, daisy, composite, or sunflower family. It is a very large and widespread family of flowering plants (Angiospermae).
Option B:
Brassicaceae or Cruciferae is a medium-sized member of the family of flowering plants. It is an economically important member. It is also known as the mustards, the crucifers, or the cabbage. It mostly comprises herbaceous plants, some shrubs, stipules or in leaf rosettes, terminal inflorescences, flowers with four free sepals, four free alternating petals, two short and four longer free stamens, and a fruit with seeds in rows, divided by a thin wall (or septum).
Option C:
Malvaceae is also known as mallows. It belongs to a family of flowering plants estimated to contain 244 genera with 4225 known species. It includes okra, cotton, cacao and durian.
Option D:
The Cucurbitaceae is also known as cucurbits or the gourd family. It is a plant family consisting of about 965 species in around 95 genera.

So, the correct option is B- Cruciferae.

Note: When carpels are fused by their styles or stigmas but possess distinct ovaries e.g., Apocynaceae. In a syncarpous gynoecium, the "fused" ovaries of the constituent carpels are referred collectively as a single compound ovary.