Question

The leafless stem of onion which is produced to bear flower is called as
A. Thalamus
B. Scape
C. Torus
D. Pedicel

Answer 1

Hint: The onion also called the common onion or bulb onion has a fan of hollow and bluish-green leaves. Its bulb at the base of the plant begins to swell as the onion is the modified leaf and stem. The leafless structure that bears flowers is tender-like.

Complete step by step answer: The bulbs of leaves on onion plants are composed of shortened, compressed, underground stems surrounded by fleshy modified leaves that cover the central bud at the tip of the stem is called a scale. When the bulb is dried out, the onions are harvested. The non-woody, leafless segment between two leaf-bearing regions, is a long internode called a scape. It is the edible part. The scape is tender and has a mild onion flavour. It forms the basal part or the whole of a stem that bears the flower or fruit. A peduncle is formed from the bulb or other structures.
i. Torus or receptacle in botany is the vegetative tissue near the end of the reproductive stems and in the angiosperms, it refers to the thick part of the stem from which flowers can grow. Thalamus is the older terminology used for the torus.
ii. The pedicel is the part of the stem or the stem that allows the attachment of one flower to the cluster of the flowers, called an inflorescence. Flowers are called sessile if the pedicel is absent.
Hence, the correct answer is option B.

Note: A scape is a single internode or just the basal internode of a peduncle in a stem without leaves or branches. It can comprise an entire peduncle with just one flower depending on the species. It is mainly found in families like Amaryllidaceae, Asphodelaceae, Balsaminaceae, Liliaceae, Papaveraceae, Droseraceae and Violaceae.