Phylogenetic system of classification is based onA) Evolutionary relationships B) Morphological featuresC) Chemical constituentsD) Floral characters

The correct answer is A) Evolutionary relationships.

Explanation: The phylogenetic system of classification is based on the evolutionary relationships between organisms. It groups organisms based on their common ancestry and evolutionary history. This system aims to reflect the true evolutionary lineage of species, often using genetic data, fossil records, and other biological characteristics to determine these relationships.

Evolutionary relationships: This is the core of the phylogenetic system, which uses information from genetics, molecular biology, and evolutionary history to classify organisms.
Morphological features: While morphological features (physical characteristics) were important in earlier classification systems, they are not the main basis for phylogenetic classification.
Chemical constituents: Chemical compounds in organisms, like proteins or DNA sequences, can provide useful data but are not the primary basis of the phylogenetic classification.
Floral characters: These are important in some classifications, particularly in plants, but they are more relevant in other systems like the morphological classification.
Thus, the phylogenetic system is primarily focused on understanding the evolutionary relationships between organisms.