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Q9(ii):
Define and understand the following terms:
(ii) Class
Solution :
1. Theoretical Definition of Class
In biological taxonomy, a Class represents a major taxonomic rank situated between the rank of Phylum (or Division in botany) and Order. It serves as a category that encompasses one or more related Orders that share a significant suite of common ancestral characteristics [Per the principles of Hierarchical Classification].
2. Taxonomic Hierarchy Positioning
To understand the position of 'Class', one must visualize the downward-narrowing pyramid of biological classification. The rank order is as follows:
| Rank | Scope |
|---|---|
| Phylum | Broadest grouping of related Classes |
| Class | Grouping of related Orders |
| Order | Grouping of related Families |
3. Structural and Functional Criteria
Organisms are grouped into a specific Class based on diagnostic characters—distinct morphological, anatomical, or physiological traits that remain consistent across different orders within that class [Reference: Linnaean Hierarchical System].
- Example in Animalia: The Class Mammalia includes orders such as Primata (monkeys, apes, humans) and Carnivora (cats, dogs). Despite the vast differences in their dietary habits and ecological niches, they are unified under the Class Mammalia by the presence of mammary glands, hair on the skin, and homeothermic regulation [Diagnostic traits of Class Mammalia].
- Example in Plantae: The Class Dicotyledonae (within the Division Angiospermae) includes all flowering plants that possess two cotyledons in their seeds, reticulate venation in leaves, and a taproot system.
4. Visual Representation of Taxonomic Inclusion
5. Analytical Conclusion
The taxonomic rank of Class is essential for managing biodiversity data. It allows taxonomists to aggregate diverse species into manageable functional groups. While species are defined by interbreeding potential, a Class is defined by broad evolutionary lineages and shared developmental blueprints [Axiom of Phylogenetic Taxonomy].
Final Solution: A Class is a taxonomic category comprising related Orders that share common fundamental features, representing a higher tier of organization in the biological classification system compared to Orders and Families.
More Questions from Class 11 Biology The Living World EXERCISES
- Q1: Why are living organisms classified?
- Q2: Why are the classification systems changing every now and then?
- Q3: What different criteria would you choose to classify people that you meet often?
- Q4: What do we learn from identification of individuals and populations?
- Q5: Given below is the scientific name of Mango. Identify the correctly written name. Mangifera Indica Mangifera indica
- Q6: Define a taxon. Give some examples of taxa at different hierarchical levels.
- Q7: Can you identify the correct sequence of taxonomical categories?
- Q8: Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand, and bacteria on the other hand.
- Q9(i): Define and understand the following terms: (i) Phylum
- Q9(iii): Define and understand the following terms: (iii) Family
- Q9(iv): Define and understand the following terms: (iv) Order
- Q9(v): Define and understand the following terms: (v) Genus
- Q10: Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.
CBSE Solutions for Class 11 Biology The Living World
Chapters in CBSE - Class 11 Biology
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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