NCERT Solutions for Class 11 Biology Chapter 1
NCERT Solutions for Class 11 Biology Chapter 1 The Living World is given below to Study online or download in PDF format free updated for new academic session 2020-2021. Solutions are applicable for boards like UP, MP, CBSE Boards, etc, who are following NCERT Books as course books.
Join the Discussion Forum to ask questions or reply the others.NCERT Solutions for Class 11 Biology Chapter 1
Class: | 11 |
Subject: | Biology |
Chapter 1: | The Living World |
Class 11 Biology Chapter 1 Solutions in English
NCERT Solutions for Class 11 Biology Chapter 1 is given below to free download in PDF form updated for new academic session 2020-2021. CBSE Offline Apps based on latest NCERT Books 2020-21 following the new CBSE Syllabus are given to download in PDF form. Join the discussion forum to ask your doubts.
Chapter 1 The Living World Solutions
Important Terms related to Chapter 1
1. Biodiversity: Term used to refer to the variety of microorganisms, plant and animals on earth.
2. Need for classification: To organise the vast number of microorganisms, plants and animals into categories that could be named, remembered, studied and understood.
3. 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.
4. Taxonomy: Study of principles and procedures of identification, nomenclature and classification.
5. 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
1. Binomial Nomenclature: Given by Carolus Linnaeus. Each scientific name has two components-Generic name + Specific epithet.
2. 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.
3. ICBN: International Code for Botanical Nomenclature (for giving scientific name to plants.)
4. ICZN: International Code of Zoological Nomenclature (for giving scientific name to animals.)
5. Zoological Parks (Places where wild animals are kept in protected environment under human care) Example: National Zoological Park, Delhi.
6. 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
1. Man → Homo sapiens
2. Housefly → Musca domestica
3. Mango → Mangifera indica
4. 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.
Important Questions on 11th Biology Chapter 1
For example, based on certain principles, once an organism is identified as an insect, it will be given a scientific name and then grouped with other similar organisms. Thus, various groups or taxon include organisms based on their similarity and differences.
Therefore, the biological classification helps in revealing the relationship between various organisms. It also helps in making study of organisms easy and organized.
Each of these two groups can be further classified on the basis of the names of the students falling in these groups.
Since it is possible that more than one student can have a particular name, these names can be further divided based on the surnames.
Since there is still some chance that more than one student can have the same surname, the final level of classification will be based on the roll numbers of each student.
Therefore, a group of similar individuals that are respectively isolated form a species.
Species can also be defined as group of individuals that share the same gene pool.
Flora, manuals, monographs and catalogues are some other means of recording descriptions. They also help in correct identification. Flora contains the actual account of habitat and distribution of plants of a given area. These provide the index to the plant species found in a particular area. Manuals are useful in providing information for identification of names of species found in an area. Monographs contain information on any one taxon.