There are three systems of classification, namely artificial, natural and phylogenetic. In natural system of classification, a large number of traits are considered. It is based on morphological, anatomical, cytological, physiological and biochemical characteristics of the organisms. The artificial system of classification is based on observable characteristics of the organisms. The phylogenetic system of classification is based on genetic and phylogenetic relationships between organisms.

Natural System of Classification

A system of classification, in which a large number of traits are considered, is called a natural system of classification. In this system, organisms are classified based on their similarities and dissimilarities in various characteristics or traits. This classification is based on the principle of organic evolution, which states that all living organisms have descended from a common ancestor and have evolved over time.

Key Points:
- Large number of traits
- Similarities and dissimilarities
- Principle of organic evolution

Explanation:
1. Large number of traits: In a natural system of classification, a large number of traits or characteristics are taken into consideration. These traits include morphological, anatomical, physiological, reproductive, genetic, and ecological characteristics of the organisms.

2. Similarities and dissimilarities: The classification is based on the similarities and dissimilarities observed in these traits among different organisms. Organisms with more similarities in their traits are grouped together, while those with more dissimilarities are placed in separate groups.

3. Principle of organic evolution: The natural system of classification is based on the principle of organic evolution. According to this principle, all living organisms have descended from a common ancestor and have gradually evolved over time through genetic changes and adaptations to their environment. Therefore, the classification is done in a way that reflects the evolutionary relationships among the organisms.

4. Hierarchical arrangement: The natural system of classification involves a hierarchical arrangement of organisms. Organisms with the most similarities are grouped together at higher taxonomic levels, such as kingdoms or phyla, while those with fewer similarities are placed in lower taxonomic levels, such as species or genera.

5. Reflects evolutionary history: The natural system of classification aims to reflect the evolutionary history and relationships among organisms. It helps in understanding the evolutionary patterns, common ancestry, and divergence of different groups of organisms.

6. Examples: Some examples of natural systems of classification include the Linnaean system, which is based on the morphological characteristics of organisms, and the phylogenetic system, which considers evolutionary relationships based on genetic and molecular data.

In conclusion, a natural system of classification is based on a large number of traits and takes into account the similarities and dissimilarities among organisms. It reflects the principle of organic evolution and aims to represent the evolutionary relationships among different groups of organisms.