Question

Bentham and Hooker classified dicots into
A. Polypetalae, gamopetalae and glumiflorae
B. Polypetalae, gamopetalae and monochlamydeae
C. Archichlamydeae, monochlamydeae and glumiflorae
D. Lignosae and herbacea

Answer 1

Hint:-George Bentham and Sir Joseph Hooker were British botanists who were closely affiliated to the Royal Botanical Gardens, Kew, in England. They divided seeded plants into three classes – Dicotyledonae, Gymnospermae and Monocotyledonae. The classification was based on the important characters of plants.

Complete Answer:-
George Bentham and Sir Joseph Hooker gave a classification system based on
characteristics of seeded plants. This system of classification was published in ‘Genera Plantarum’ in
three volumes. They classified dicotyledonae into three sub class:
1. Polypetalae: plants with free petals are known as polypetalae. It is further divided into 3
series- Thalamiflorae, Disciflorae and Calyciflorae
2. Gamopetalae: plants with fused petals are known as gamopetalae. It is further divided into
three series- Infobae, Heteromerae, Bicarpellate
3. Monochlamydeae: these are the plants having flowers with single whorl of perianth are
placed. They have incomplete flowers. It has eight series- Curvembryeae, Multivulatae aquatics,
Multivulatae terrestris, Micro Embry Uae, Daphnoides, Chlamydospores, Unisexuales, Ordines
anomaly.
Thus, the right option is B.

Additional information:- This system of classification is used as a key for the identification of plants in Kew herbarium. The placement of monocotyledonae in this system appears to be in accordance with the evolutionary trends.

Note:- It is a natural classification based system on real examination of specimens. Many important floral characters have been neglected in this system. Unrelated families are grouped nearer. The location of gymnospermae in between dicotyledonae and monocotyledonae was an error.