Assertion: A morphology-based approach to taxonomy is called alpha taxonomy and it is old fashioned.
Reason: A multidisciplinary approach to taxonomy called omega taxonomy is favoured in recent years as it excludes morphological features.
(a)Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
(b)Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
(c)Assertion is correct but Reason is incorrect
(d)Both Assertion and Reason are incorrect.

Hint: Taxonomy is the science of using genetic, morphological, biochemical observations and behavior for describing, naming, and classifying organisms of the world which includes all microorganisms, animals, and plants. Taxonomists have named about 1.78 million species of microorganisms, animals, and plants in the past 250 years of research.

Complete answer:
Every living organism needs a recognition, maybe a name, identification or classification to which they belong to so it can be addressed using this, taxonomy helps in this. The father of Taxonomy is Carolus Linnaeus and alpha and omega come under the process of Taxonomy. The alpha Taxonomy is the very initial phase of taxonomic activity that involved the naming of characterized biological species and is also known as classical taxonomy. Being the starting taxonomy it is the parent of other taxonomy. It is said that Beta taxonomy is the grammar of biology and Alpha taxonomy is the alphabet of biology. These two taxonomies create a relational link between the various biological species. Omega taxonomy also known as Encyclopaedic taxonomy is one another level of taxonomy that has modern experimental taxonomy denoted by Epling. Here the taxonomic activities have used the information from branches such as cytogenetics, ecology, phylogeography, phytochemistry, and physiology coupled with adequate computation. This involves external morphological features.

So, the correct is, ‘Assertion is correct but Reason is incorrect ’.

Note: There are other types of Taxonomy like the Beta taxonomy or Explorative taxonomy, Cytotaxonomy, Chemotaxonomy, and Karyotaxonomy. The Beta taxonomy is the second stage of the activity and includes external morphology and internal characteristics like cytological, embryological, anatomical characters etc. It relates to the exploration of a natural system of classification grouping the organisms into their group of relatives.