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Biological Classification

Punjab Board · Class 11 · Biology

Quick revision notes for Biological Classification — Punjab Board Class 11 Biology. Key concepts, formulas, and definitions for last-minute revision.

45 questions28 flashcards5 concepts

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A timeline illustrating the progression from Linnaeus's Two Kingdom system to R.H. Whittaker's Five Kingdom system, highlighting the key additions and changes in classification criteria.
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Key Topics to Revise

1

History and Need for Classification

  • Aristotle was the first to attempt scientific classification – he classified plants into trees, shrubs, and herbs, and animals into those with red blood and those without.
  • Linnaeus proposed the Two Kingdom Classification: Kingdom Plantae and Kingdom Animalia.
  • The Two Kingdom system was inadequate because it did not separate prokaryotes from eukaryotes, unicellular from multicellular organisms, and photosynthetic from non-photosynthetic organisms.
2

Five Kingdom Classification – Comparative Overview

  • Kingdom Monera: Prokaryotic cells, no nuclear membrane, cell wall of polysaccharide + amino acids (non-cellulosic), cellular body organisation, both autotrophic and heterotrophic nutrition.
  • Kingdom Protista: Eukaryotic cells, nuclear membrane present, cell wall present in some, cellular body organisation, both autotrophic and heterotrophic nutrition.
  • Kingdom Fungi: Eukaryotic cells, nuclear membrane present, cell wall made of CHITIN, multicellular/loose tissue organisation, heterotrophic (saprophytic/parasitic) nutrition.
3

Kingdom Monera

  • Bacteria are the SOLE members of Kingdom Monera.
  • Most abundant micro-organisms; found everywhere including extreme habitats (hot springs, deserts, snow, deep oceans).
  • Four shapes of bacteria: Coccus (spherical), Bacillus (rod-shaped), Vibrio (comma-shaped), Spirillum (spiral).
4

Kingdom Protista

  • All single-celled eukaryotes are placed under Protista.
  • Primarily aquatic; form a link between plants, animals, and fungi.
  • Have well-defined nucleus and other membrane-bound organelles.

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Key Concepts

The systematic arrangement of organisms intoProposed by RContains prokaryotic organisms that lackArchaeabacteria are special bacteria that surviveContains all single

Frequently Asked Questions

What are the important topics in Biological Classification for Punjab Board Class 11 Biology?
Key topics in Biological Classification include Five Kingdom Classification – Overview Mind Map, Five Kingdom Classification – Overview Mind Map, Five Kingdom Classification System Overview. These are the concepts Punjab Board Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Biological Classification — Punjab Board Class 11 Biology?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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