Biology · The Living World · NEET
Ascending means lowest to highest. The order is: Species, Genus, Family, Order, Class, Phylum, Kingdom. NCERT Figure 1.1 shows this exact sequence starting with Species at the bottom. Species is the smallest, most specific group; Kingdom is the biggest, most general group.
Descending means highest to lowest. Just reverse the ascending list: Kingdom, Phylum, Class, Order, Family, Genus, Species. This is the order you follow when you classify an organism top-down (like Kingdom Animalia down to species Homo sapiens).
Species is the LOWEST (basic) category, and Kingdom is the HIGHEST. As you go up from Species to Kingdom, the number of organisms in the group increases, but the number of shared (common) characters decreases. Lower category = fewer organisms but more shared features.
In descending order, Class comes BEFORE Order (Class is higher). Full descending order: Kingdom > Phylum > Class > Order > Family > Genus > Species. So Class is above Order. Students often flip Class and Order — that is the exact NEET 2022 trap.
The sequence of ranks is the SAME for both. The only change is that animals use the rank Phylum, while plants use Division in that same position. So for plants: Species, Genus, Family, Order, Class, Division, Kingdom. Everything else is identical.
Use the sentence "King Philip Came Over For Good Soup" for descending order: Kingdom, Phylum, Class, Order, Family, Genus, Species. For plants, replace 'Philip' with 'Division'. Read the sentence backwards to get ascending order (Species to Kingdom).
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.
There are seven main (obligate) taxonomic categories: Species, Genus, Family, Order, Class, Phylum (or Division), and Kingdom. Sometimes extra ranks like sub-family or tribe are inserted between them, but these seven are the ones NEET tests.
Species has the maximum number of common (shared) characters, because it is the lowest and most specific rank. As you move up toward Kingdom, the number of shared characters keeps decreasing while the number of organisms increases.
In plants, the rank Division is used in place of Phylum. So the plant hierarchy (ascending) is: Species, Genus, Family, Order, Class, Division, Kingdom. The position in the sequence is exactly the same as Phylum in animals.
Because it is a fixed, factual sequence that is easy to test with match-the-column and arrange-in-order questions. It has appeared in NEET 2016, 2017, 2022 and ReNEET 2026. Knowing both ascending and descending order guarantees these marks.
