Correct hierarchy of classification of plants is:
- (a)Class – Order – Family – Genus – Species
- (b)Family – Order – Class – Genus – Species
- (c)Order – Class – Genus – Family – Species
- (d)Genus – Family – Class – Order – Species
Correct — A, Class – Order – Family – Genus – Species.
Linnaean classification nests groups inside larger groups. All four options close with Species, so the sequence is meant to run from the broadest rank down to the narrowest, and Class – Order – Family – Genus – Species is the arrangement that holds that direction from start to finish.
Read the ranks as containers. A class contains orders, an order contains families, a family contains genera, and a genus contains species — each rank is a box sitting inside the next larger box.
Rice makes it concrete: class Liliopsida (the monocots), order Poales, family Poaceae, genus Oryza, species Oryza sativa. Every step down narrows the group and adds shared characters.
The full plant hierarchy carries Kingdom and Division above Class. The stem asks only for the correct order among the five ranks printed, so starting at Class is not a defect in this option.
- (b)Family – Order – Class – Genus – Species — Family, then Order, then Class is this ladder climbed rather than descended: a family sits inside an order, and an order inside a class. Those three terms are the correct arrangement from narrowest to broadest.
The option's own tail then reverses course, since Genus followed by Species runs downward. A hierarchy has to be read one way throughout, and this one changes direction midway.
- (c)Order – Class – Genus – Family – Species — The blocks are placed correctly here: Class and Order do outrank Family and Genus, and that is the part the option states truly.
Inside each block it is inverted. Class is broader than Order, and Family is broader than Genus, so both swaps have to be undone before the list reads top-down as Class, Order, Family, Genus, Species.
- (d)Genus – Family – Class – Order – Species — Taken as an upward step, Genus followed by Family is true — a genus sits inside a family — which makes Family the principal rank that contains a genus. As a top-down hierarchy that pair is the wrong way round.
The option then jumps up to Class and Order, both broader than Family, before dropping to Species. Placed correctly the sequence is Class, Order, Family, Genus, Species.
Plant classification is a ladder of nested ranks. The principal ones, broadest first, are Kingdom, Division (called Phylum in animal classification), Class, Order, Family, Genus and Species.
Each rank is a group of the rank below it, so a family is a set of genera and a genus is a set of species. Species is the basic unit — the group whose members resemble one another most closely.
This ladder is what a scientific name encodes. Mangifera indica places the mango in the genus Mangifera and distinguishes it within that genus by the epithet indica, so a two-word name is really a position in the hierarchy.
The higher ranks are readable too. Standard botanical endings mark division, class, order and family, so a name such as Poaceae announces its rank before you know anything else about the plant.
What follows from these ranks is the whole working apparatus of botany: floras, identification keys, the arrangement of a herbarium, and the code that governs valid names.
- The principal ranks, broadest to narrowest, are Kingdom, Division, Class, Order, Family, Genus, Species.
- Botany uses Division where zoology uses Phylum; both occupy the rank between Kingdom and Class.
- Standard botanical endings mark rank: -phyta for a division, -opsida for a class, -ales for an order, -aceae for a family.
- Rice sits in class Liliopsida, order Poales, family Poaceae, genus Oryza, species Oryza sativa.
- A scientific name is binomial: the genus first with a capital letter, then the species epithet in lower case, both italicised.
- Intermediate ranks such as subclass, subfamily, tribe and subgenus can be inserted between the principal ranks.
- Botanical nomenclature takes its starting point from Linnaeus's Species Plantarum, published in 1753.
Each row is contained in the row above it; the highlighted species is the basic unit at the foot of the ladder.
- The keyed sequence begins at Class, not Kingdom; the stem asks for the correct order among the ranks printed, not for the complete Linnaean ladder.
- In ordinary speech an 'order' sounds like a wide category, but Class is the broader rank and Order sits beneath it.
- The genus is written first in a scientific name even though Family is the broader rank — naming order is not rank order.
- A list running bottom-up is still a hierarchy, so check the direction of a whole option instead of matching only its first two terms.
- Division and Phylum name the same level under different codes, so a paper may print either one between Kingdom and Class.
The form evidenced here is a sequencing item: the ranks are printed in four arrangements and you pick the one that runs consistently from broad to narrow, or sometimes from narrow to broad. UPPSC 2024 GS-I Q12 is that shape.
The same content can also be tested as a rank-matching item — a taxon name such as Poaceae or Poales set against its rank — or as a nomenclature item asking which word of a binomial names the genus.
The preparation is the same either way: hold Class, Order, Family, Genus, Species firmly enough to place any one rank relative to the others, whichever way the paper turns the ladder.
UPPSC_2024_PRE_GSI_Q122024The same idea in the same format — four scrambled arrangements of plant taxonomic ranks, with the task of picking the one that runs from higher to lower. What differs is the stretch of the ladder covered: that item works across Plant Kingdom, Phylum, Class and Order, while this one starts at Class and runs down through Family and Genus to Species. It also prints Phylum, the zoological term, where botanical practice uses Division for the same level.
- practice — not a real PYQ
Arrange the following ranks of plant classification from the broadest to the narrowest.
- (a)Kingdom – Division – Class – Order – Family – Genus – Species
- (b)Kingdom – Class – Division – Order – Family – Genus – Species
- (c)Kingdom – Division – Order – Class – Family – Genus – Species
- (d)Kingdom – Division – Class – Family – Order – Genus – Species
Answera — the principal ranks descend Kingdom, Division, Class, Order, Family, Genus, Species.Option b lifts Class above Division, though Division is the rank immediately below Kingdom. Option c places Order above Class, reversing that pair. Option d places Family above Order, though an order is a grouping of families.
- practice — not a real PYQ
In plant classification, the ending -aceae in a name such as Poaceae indicates which rank?
- (a)Division
- (b)Class
- (c)Order
- (d)Family
Answerd — -aceae is the standard botanical ending for a family, as in Poaceae, Fabaceae and Asteraceae.Divisions take -phyta, classes take -opsida and orders take -ales, which is why Magnoliophyta, Magnoliopsida and Poales name a division, a class and an order respectively.
- practice — not a real PYQ
Which one of the following pairs of a plant taxon and its rank is correctly matched?
- (a)Poales – Family
- (b)Poaceae – Order
- (c)Magnoliophyta – Division
- (d)Liliopsida – Genus
Answerc — Magnoliophyta is the division of flowering plants, and -phyta is the ending that marks a division.Poales is an order and Poaceae is the family within it, so a and b swap those two ranks. Liliopsida is the class of monocotyledons; the -opsida ending marks a class, not a genus.
- practice — not a real PYQ
Which one of the following statements about the plant classification hierarchy is correct?
- (a)A genus is made up of one or more families.
- (b)An order is made up of one or more families.
- (c)A class lies within an order.
- (d)A species is made up of one or more genera.
Answerb — families are grouped into orders, so an order is made up of families.Options a and d run the ladder upside down: a family is a group of genera rather than the reverse, and a species sits below its genus instead of containing genera. Option c swaps Class and Order, since orders lie within a class.