Α taxonomy pertains to

The correct option is Classical taxonomy.

To understand why this is the correct answer, let us break down what alpha (α) taxonomy is and how it relates to the given choices:

1. Definition of Alpha (α) Taxonomy: Alpha taxonomy refers to the level of taxonomy that is concerned with the finding, describing, and naming of organisms (species). It is the primary and most fundamental step in biological classification, focusing on the identification and naming based mainly on easily observable, morphological characteristics.

2. Relation to Classical Taxonomy: Classical taxonomy is the traditional method of classifying organisms, which relies heavily on physical traits, external morphology, and observable characteristics. Since alpha taxonomy is also centered around identifying, describing, and naming species based on these fundamental morphological properties, it is essentially synonymous with, or a key part of, Classical taxonomy.

3. Why other options are incorrect:
- Chemotaxonomy: This is the classification of organisms based on chemical constituents (like proteins, amino acids, or secondary metabolites), which goes beyond basic alpha description.
- Phylogeny: This refers to the evolutionary history and relationships of organisms, which is the focus of omega (ω) taxonomy rather than alpha taxonomy.
- Experimental taxonomy: This involves experimental methods (such as genetics, cytology, and breeding experiments) to determine evolutionary and taxonomic relationships (often associated with beta or gamma taxonomy).

Therefore, alpha (α) taxonomy pertains directly to Classical taxonomy.