Class 11 Biology - ODISHA
Biological Classification
The chapter Biological Classification in Class 11 Biology under the Odisha BSE syllabus introduces students to the scientific systems of categorizing living organisms. It covers historical milestones from Aristotle's simple morphological groupings to R.H. Whittaker's comprehensive Five Kingdom Classification system, which includes Monera, Protista, Fungi, Plantae, and Animalia. Students will explore the defining characteristics, cellular structures, modes of nutrition, and reproduction methods of each kingdom. Additionally, the chapter sheds light on acellular entities like viruses, viroids, and lichens. Mastering this chapter is crucial for board exams as it forms the foundational basis for plant and animal physiology.
Start Learning FreeKey Concepts
Two Kingdom to Five Kingdom Classification
Evolution of classification systems moving from Linnaeus's Two Kingdom system to Whittaker's Five Kingdom system based on cell structure, thallus organization, mode of nutrition, reproduction, and phylogenetic relationships.
Kingdom Monera
Comprises all prokaryotic organisms, primarily bacteria, characterized by the absence of a true nucleus and membrane-bound organelles. They exhibit diverse modes of nutrition including autotrophic and heterotrophic.
Kingdom Protista
Includes single-celled eukaryotes like chrysophytes, dinoflagellates, euglenoids, slime moulds, and protozoans, bridging the gap between simple prokaryotes and complex multicellular eukaryotes.
Kingdom Fungi
Heterotrophic, spore-bearing eukaryotic organisms with cell walls made of chitin, living mostly as saprophytes or parasites, featuring a body made of thread-like structures called hyphae.
Viruses, Viroids, and Lichens
Acellular infectious agents and symbiotic associations that fall outside the traditional Five Kingdom classification scheme because they lack true cellular machinery when free-living.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 11 Biology examinations, this chapter typically carries around 6 to 8 marks. Questions frequently include short-answer questions on the basis of Whittaker's classification, differences between autotrophic and heterotrophic bacteria, distinguishing features of Fungi classes, and descriptive questions on the structure and economic importance of viruses and lichens.
Frequently Asked Questions
Viruses are non-cellular organisms that are characterized by having an inert crystalline structure outside the living cell. Since they do not have a cell structure or independent metabolic machinery, they are not considered truly 'alive' when outside a host and are thus excluded from the Five Kingdom system.
Viruses are not included because they are non-cellular entities that lack a cell structure and independent metabolic machinery outside a host body, making them strictly non-living outside living host cells.
What is the main difference between Gram-positive and Gram-negative bacteria?
Gram-positive bacteria retain the crystal violet stain used in the Gram staining method due to a thick peptidoglycan cell wall, whereas Gram-negative bacteria do not retain the stain because they possess a thinner peptidoglycan layer and an outer membrane.
What are the roles of phycobiont and mycobiont in lichens?
The phycobiont is the algal component which is autotrophic and prepares food through photosynthesis, while the mycobiont is the fungal component which provides shelter, absorbs water, and supplies mineral nutrients to the algae.
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