Class 11 Biology - PUNJAB
Biological Classification
The chapter Biological Classification in Class 11 Punjab (PSEB) biology introduces the scientific system of categorizing living organisms. Students learn about Aristotle's early attempts, Ernst Haeckel's three-kingdom, and R.H. Whittaker's famous Five Kingdom Classification system, which includes Monera, Protista, Fungi, Plantae, and Animalia. The curriculum highlights the defining characteristics, modes of nutrition, and reproduction of each kingdom. Additionally, the chapter covers acellular entities like viruses, viroids, prions, and lichens. Mastering this topic is crucial for board exams as it forms the foundational base for plant and animal physiology and diversity.
Start Learning FreeKey Concepts
Five Kingdom Classification
Proposed by R.H. Whittaker in 1969, classifying organisms into Monera, Protista, Fungi, Plantae, and Animalia based on cell structure, thallus organization, mode of nutrition, reproduction, and phylogenetic relationships.
Kingdom Monera
Comprises all prokaryotic organisms, primarily bacteria. They can be autotrophic or heterotrophic and exhibit immense metabolic diversity.
Kingdom Fungi
Heterotrophic eukaryotic organisms with chitinous cell walls that absorb soluble organic matter, reproducing through spores, conidia, or fragmentation.
Viruses and Viroids
Non-cellular infectious agents consisting of genetic material (DNA or RNA) enclosed in a protein coat, which are inert outside a host cell. Viroids are smaller and lack the protein coat.
Lichens
Symbiotic associations between algae (phycobiont) and fungi (mycobiont) that act as sensitive pollution indicators.
Important Formulas
Board Exam Info
In the Punjab (PSEB) Class 11 Biology board exams, this chapter typically carries around 4 to 6 marks. Questions frequently include short-answer types on Whittaker's criteria, distinctions between viruses and viroids, characteristics of lichens, and long-answer questions detailing the Five Kingdom Classification.
Frequently Asked Questions
What are the main criteria used by R.H. Whittaker for classification?
Whittaker used cell structure, thallus organization, mode of nutrition, reproduction, and phylogenetic relationships as the main criteria.
Why are viruses not included in Whittaker's Five Kingdom Classification?
Viruses are non-cellular organisms that do not have a cell structure and cannot live independently outside a host, so they are not placed in any kingdom.
What is the difference between a virus and a viroid?
Viruses have genetic material enclosed in a protein coat, whereas viroids are infectious RNA particles that lack the protein coat.
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