Question

The inflorescence of Coriander is?
A. Umbel
B. Corymb
C. Typical raceme
D. Umbel of umbels

Answer 1

A modified shoot which is specialized to bear flowers is known as inflorescence. In racemose inflorescence, the growing point continues its growth. Flowers are borne laterally in acropetal succession or centripetal arrangement. Such inflorescence can be observed in carrots as well.

Complete answer: In racemose inflorescence, growing point continues its growth. Flowers are borne laterally in acropetal succession (older flowers at the base and younger towards the tip) or centripetal arrangement (younger towards the centre and older towards the periphery). The inflorescence of the coriander is an umbel of umbels. Umbel of umbels is a type of racemose inflorescence, which is also known as the compound umbel. It consists of a number of short flower stalks called pedicels which spread from a common point, somewhat like umbrella ribs.
a) Umbel: In this type, the peduncle is very much reduced. The pedicellate flower is arranged centripetally with a whorl of bracts called Involucre e.g., Centella (Brahmi Booti).
b) Corymb: The peduncle is slightly short. Pedicels of the lower flower are very long so that all the flowers come to lie at the same level. E.g., Iberis amara (Candy Tuft), Capsella.
c) Typical Raceme: It involves unbranched and elongated peduncle that bears pedicellate flowers with pedicels of all flowers of equal length. Acropetal arrangements. E.g., Delphinium , Raphanus.

So, the correct answer is option D.

Note: Flower may occur singly or in groups. A specialized branch, which bears a group of flowers is known as the peduncle. A straightened peduncle is called a receptacle. The arrangement and distribution of flowers on the inflorescence axis (or peduncle or mother axis) are called an inflorescence. A modified shoot which is specialized to bear flowers is also known as inflorescence.