Step 1: Understanding the Concept:
This question requires matching specific morphological features (related to androecium, fruit, gynoecium, and inflorescence) with the plant families in which they are characteristic.
Step 2: Detailed Explanation:
Let's analyze each characteristic in List-I:
A. Monoadelphous stamen: This condition, where all stamens are fused by their filaments into a single tube (staminal tube) surrounding the style, is a hallmark characteristic of the family Malvaceae (the Mallow family, which includes cotton and hibiscus). Thus, A matches with I.
B. Cremocarp: This is a special type of dry schizocarpic fruit that splits into two one-seeded segments called mericarps. This fruit type is characteristic of the family Apiaceae (also known as Umbelliferae, the Carrot family). Thus, B matches with III.
C. Gynobasic style: In this condition, the style arises from the base of a deeply four-lobed ovary. This is a defining feature of the family Lamiaceae (also known as Labiatae, the Mint family). Thus, C matches with II.
D. Capitulum: Also known as a head, this is an inflorescence consisting of a dense cluster of small, sessile flowers arranged on a common receptacle. This is the characteristic inflorescence of the family Asteraceae (also known as Compositae, the Sunflower family). Thus, D matches with IV.
Step 3: Final Answer:
The correct set of matches is A-I, B-III, C-II, D-IV, which corresponds to option (B).