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Q7:
Can you identify the correct sequence of taxonomical categories?
Solution :
Theoretical Foundation: The Hierarchical System of Classification
In biological systematics, the classification of organisms is governed by a hierarchical arrangement of taxonomic ranks, often referred to as the Linnaean Hierarchy or the Taxonomic Bottleneck. Each level represents a different degree of inclusiveness, moving from the most general (broadest) to the most specific (narrowest) categories. [Ref: Taxonomic Hierarchy, International Code of Nomenclature for algae, fungi, and plants (ICN)].
Step 1: Defining the Taxonomic Ranks
The sequence must follow a strict vertical order of decreasing universality and increasing specificity. The standard sequence is defined as follows:
- Domain: The highest rank, categorizing life by fundamental cellular structure (e.g., Eukarya).
- Kingdom: Major groups of related phyla (e.g., Animalia).
- Phylum (or Division for plants): A group of classes with common ancestry.
- Class: A group of related orders.
- Order: A group of related families.
- Family: A group of related genera.
- Genus: A group of related species.
- Species: The basic unit of classification, comprising organisms that can interbreed.
Step 2: Analytical Comparison of Sequence
To identify the correct sequence, we examine the flow of decreasing specificity. The following table illustrates the shift in the number of shared characters as we descend the hierarchy:
| Rank | Shared Characteristics |
|---|---|
| Kingdom | Minimum |
| Phylum | Increasing |
| Class | Increasing |
| Order | Increasing |
| Family | Increasing |
| Genus | Increasing |
| Species | Maximum |
Step 3: Visualizing the Taxonomic Hierarchy
Step 4: Formal Logical Sequencing
The correct sequence, arranged from the most inclusive (highest rank) to the least inclusive (lowest rank), is expressed algebraically as a set $S = \{K, P, C, O, F, G, S\}$ where $K > P > C > O > F > G > S$.
Any sequence provided in academic exercises must strictly adhere to the arrangement: Kingdom → Phylum (or Division) → Class → Order → Family → Genus → Species.
Final Solution: The correct taxonomical sequence, starting from the most inclusive category to the least, is Kingdom, Phylum (or Division), Class, Order, Family, Genus, and Species.
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.
- 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(ii): Define and understand the following terms: (ii) Class
- 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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