Biology · The Living World · NEET
A taxon is a group of organisms that biologists treat as one unit in classification and give a rank to. NCERT says the scientific term for convenient groups like 'Dogs', 'Cats', 'Mammals', 'Wheat', 'Plants' is taxa (singular: taxon). So any real, nameable group of organisms you can put a rank on is a taxon. This matters for NEET because many one-mark questions just test whether you know a taxon is a rank/unit, not a single organism.
It means the same word 'taxon' is used for both small groups and very large groups. NCERT gives the exact example: 'animals', 'mammals' and 'dogs' are all taxa, but a dog is a mammal and mammals are animals. So dog is a low-level taxon, mammal is a middle-level taxon, and animal is a high-level taxon. They are all taxa, just placed at different heights in the classification.
A category (like Species, Genus, Family, Order, Class, Phylum/Division, Kingdom) is the rank or slot. A taxon is the actual group of organisms placed into that slot. Example: 'Species' is a category, but Panthera leo (lion) filling that category is a taxon. NCERT says each rank 'is commonly termed as taxon'. In NEET, treat category as the empty label and taxon as the group sitting inside it.
Yes, both are taxa. NCERT clearly states: 'Plants – also form a taxa. Wheat is also a taxa.' Even though Plant is huge and Wheat is small, each is a group of organisms with shared characters, so each is a taxon. This is a common confusion: students think only Kingdom or Species can be a taxon, but any valid rank is a taxon.
Taxon is singular; taxa is plural. So one group = one taxon, and many groups = many taxa. NCERT writes 'taxon (pl.: taxa)'. NEET options sometimes misuse these two words, so read carefully: 'a taxon' should refer to one group only.
NCERT says taxonomic categories/taxa 'are distinct biological entities and not merely morphological aggregates'. This means a taxon is a true biological group, not just organisms that happen to look alike. So a taxon reflects real shared biology (structure, development, cell structure, ecology), which is why it can be given a proper rank.
In the taxonomic categories, which hierarchical arrangement (as listed below) is correct in the case of animals?
Arrange the following taxonomic categories in ascending order: (a) Genus, (b) Class, (c) Order, (d) Phylum, (e) Family, (f) Kingdom, (g) Species.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Dogs, Mammals and Animals are three taxa. NCERT uses exactly these to show that a dog is a mammal and mammals are animals, so they are taxa at low, middle and high levels.
No. A taxon is a group of organisms at a rank. Taxonomy is the whole process of classifying organisms into such taxa. Taxon is the unit; taxonomy is the activity.
No. A taxon is a group of organisms sharing common characters, not one single individual. Even the lowest taxon, Species, is a group of similar individuals.
Because students often think only Kingdom or Species counts as a taxon. NCERT stresses that taxa can be at very different levels, so NEET checks if you understand that any valid rank (dog, family, phylum) is a taxon.
