Animal Classification
Maharashtra Board · Class 10 · Science
Quick revision notes for Animal Classification — Maharashtra Board Class 10 Science. Key concepts, formulas, and definitions for last-minute revision.
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History and Benefits of Animal Classification
- Aristotle was the first to classify animals based on body size, habits, and habitats (Artificial method)
- Natural system of classification based on body organization, cell types, chromosomes, and biochemical properties
- Carl Woese proposed modern animal classification system
Traditional Classification System
- Animals divided into Non-chordates and Chordates based on notochord presence
- Non-chordates: no notochord, solid paired ventral nerve cord, dorsal heart
- Ten non-chordate phyla: Protozoa, Porifera, Cnidaria, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata
Modern Classification Criteria
- Based on Robert Whittaker's five kingdom system
- All multicellular animals in Kingdom Animalia
- Five main criteria: Body organization, Body symmetry, Body cavity, Germinal layers, Segmentation
Body Organization and Symmetry
- Protoplasmic grade: All functions in single cell (unicellular organisms)
- Cellular grade: No tissues formed (Porifera)
- Cell-tissue grade: Cells form tissues (Cnidaria)
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