Question

Write any three merits of bentham and hooker’s system of classification of plants.

Answer 1

Bentham and Hooker devised a categorization system for seed plants. It is the most advanced natural categorization system, having been published in three volumes in the book Genera plantarum $\left( {1862 - 83} \right)$. They identified $97,205$ seed plant species from $7,569$ genera and $202$ families, ranging from Ranunculaceae to Gramineae. The pre-Darwinian idea of genus delimitation was based on natural affinities. All seed plants were grouped into three categories: Dicotyledons ($165$ families), Gymnosperms ($3$ families), and Monocotyledons ($34$ families).

Complete Explanation:
Each plant has been documented using either the real specimen or conserved herbarium sheets, resulting in extensive and precise descriptions.
The approach is quite practical and may be used by students of systematic botany to quickly identify species.
The general descriptions are full, accurate, and based on actual observations, and the flora specifies the geographical distribution of species and genera.
Larger genera have been broken down into sub genera, each with its own set of species.
Dicots begin with the Ranales order, which is now widely regarded as the most primitive angiosperm.
The placement of monocots after dicots is normal and follows evolutionary patterns.
It's quite normal for a series disciflorae to be placed between thalami florae and calyciflorae.
The placement of gamopetalae after polypetalae is warranted since the union of petals is seen as a superior characteristic to the free state.

Note:
The most important natural method of categorization of flowering plants was proposed by Bentham and Hooker. Plants were divided into two groups: Cryptogams (non-flowering plants) and Phanerogams (flowering plants) (flowering plants). All seed plants were grouped into three categories: Dicotyledons, Gymnosperms and Monocotyledons. It was useful in determining links between distinct plant taxa, but it was ineffective in identifying evolutionary ties between them. Gymnosperms were incorrectly placed between monocotyledons and dicotyledons.