Discussion
The family is central in flowering plant systematics : This is the principle of..................system of classification.
Answer: A
It is the principle of the APG system.
The Angiosperm Phylogeny Group's first classification (1998) opens with the statement that the family is central in flowering plant systematics, and it is built on families (and the orders that group them) defined as monophyletic from molecular, chiefly DNA sequence, evidence. Later versions (APG II to APG IV) keep the same emphasis.
Bentham and Hooker and Engler and Prantl were nineteenth-century systems based on morphology, the first a natural and the second an early phylogenetic system. Armen Takhtajan's system is a phylogenetic scheme built on morphology and organised around subclasses and superorders. None of them is associated with this statement.
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