Question

The process wherein the labellum in Orchidaceae surfaces at the anterior side via the twisting of the ovary through 180 degree
A. Articulation
B. Adnation
C. Attenuation
D. Resupination

Answer 1

Hint:
The different organs that meld together are called antecedent organs. Adnation is the term used to describe the merging of these disparate organs. Organs like stamens, petals, sepals, etc. in flowering plants merge with one another to generate adnate organs. As an illustration, the stamens of the primrose, Primula, are attached to the petals.
Connation refers to the developmental joining together of organs of the same type in plants, such as the petals joining to form a tubular corolla. As opposed to adnation, which involves the merging of disparate organs.
An anther is adnate when it is attached to the filament along its whole length. Having one side that is attached to a stem; used to describe coral lateral zooids and other compound organisms.

Complete answer:
Numerous plants, such as the sunflower, have their floral axis rotated such that the bloom faces the sun. The process of rolling leaves is used to stop transpiration. Stalk turns 180 degrees as it progresses. This causes the flower's bottom to rise to the top and vice versa. This is most frequently seen in the orchid family.
So, resupination is the process in which the labellum at the anterior.

Option ‘D’ is correct

Note:
Resupination, as it is known in botany, is the "twisting" through 180 degrees of flowers or leaves when they open. The "stalk" or petiole of resupinate leaves is twisted, and resupinate blooms twist as they open. The Orchidaceae family contains the most straightforward example of resupination.
Resupination was very certainly present from the beginning in this family in order to establish the distinctive orchid arrangement of floral parts, as all branches of this family contain species with resupinate flowers.