Biology · The Living World · NEET
A class is a taxonomic category (a rank) that is made of related orders. So a class is one step higher than order. Many orders that share a few common features are grouped into one class. For NEET, just remember: Class = a group of related Orders.
Class is ABOVE order. Going from lowest to highest the sequence is Species -> Genus -> Family -> Order -> Class -> Phylum/Division -> Kingdom. So order is smaller and sits inside a class. One class can hold many orders, but one order belongs to only one class.
Class Mammalia is the classic NCERT example. It contains order Primata (monkey, gorilla, gibbon) and order Carnivora (tiger, cat, dog), plus other orders. All these different animals are put in one class because they share mammal features like hair and milk glands. Another example is Class Insecta, which contains order Diptera (housefly).
Order is a group of related families; class is a group of related orders. So class is bigger and higher. Members of the same class share fewer common characters than members of the same order, because as you go higher in the hierarchy the shared features become fewer and more general.
For housefly (Musca domestica): Class is Insecta, Order is Diptera, Phylum is Arthropoda. For horse (Equus caballus): Class is Mammalia, Order is Perissodactyla, Family is Equidae. NEET loves to test which term is the class and which is the order, so link each name to its rank.
Yes. Both plants and animals use the category class. The difference is only just above class: in animals the next higher rank is Phylum, while in plants it is Division. For example, in the mango classification the class is Dicotyledonae.
Match Column-I with Column-II for housefly classification: A. Family, B. Order, C. Class, D. Phylum with (i) Diptera, (ii) Arthropoda, (iii) Muscidae, (iv) Insecta.
Which of the following represents order of 'Horse'?
Try the real previous-year questions from this chapter — each with the answer and a full solution.
A class is a taxonomic category that groups together related orders.
Phylum is higher. In animals the order is Species -> Genus -> Family -> Order -> Class -> Phylum -> Kingdom, so phylum is one step above class.
Class Mammalia contains order Primata (monkey, gorilla, gibbon) and order Carnivora (tiger, cat, dog), among others.
Yes, both use class. Only the rank above class differs: Phylum in animals and Division in plants.
The housefly belongs to Class Insecta, within order Diptera and phylum Arthropoda.
