NCERT Solutions for Class 11 Biology Chapter 1 The Living World is given below to Study online or download in PDF form free. Solutions are applicable for boards like UP, MP, CBSE, etc. who are following NCERT Books as course books.
NCERT Solutions for Class 11 Biology Chapter 1
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The Living World: Solutions
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Important Terms on Living world
- Biodiversity: Term used to refer to the variety of microorganisms, plant and animals on earth.
- Need for classification: To organise the vast number of microorganisms, plants and animals into categories that could be named, remembered, studied and understood.
- Three Domains of Life: Proposed by Carl Woese in 1990 who also proposed the six kingdom classification for living organisms. The three Domains of life are Archaea, Bacteria and Eukarya.
- Taxonomy: Study of principles and procedures of identification, nomenclature and classification.
- Systematics: It deals with classification of organisms based on their diversities and relationships among them. Terms was proposed by Carolus Linnaeus who wrote ‘Systema Naturae’.
Kingdom → Phylum /Division → Class → Order → Family → Genus → Species.
- Binomial Nomenclature: Given by Carolus Linnaeus. Each scientific name has two components-Generic name + Specific epithet.
- Rule for Nomenclature:
Latinised names are used.
First word is genus, second word is species name. Printed in italics; if handwritten then underlined separately. First word starts with capital letter while species name written in small letter.
- ICBN: International Code for Botanical Nomenclature (for giving scientific name to plants.)
- ICZN: International Code of Zoological Nomenclature (for giving scientific name to animals.)
- Zoological Parks (Places where wild animals are kept in protected environment under human care) Example: National Zoological Park, Delhi.
- Herbarium Store house of dried, pressed and preserved plant specimen on sheets, kept systematically according to a widely accepted system of classification, for future use.
Scientific names of some organisms:
- Man → Homo sapiens
- Housefly → Musca domestica
- Mango → Mangifera indica
- Wheat → Triticum aestivum
Concept of Species
All the members that can interbreed among themselves and can produce fertile offsprings are the members of same species. This is the biological concept of species proposed by Mayr.
Taxa: Each category (i.e., unit) of classification is called as a taxon.
Taxonomic Hierarchy: Classification of organisms in a definite sequence of taxon or category or rank in a descending order.