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Have you ever wondered what exactly makes something living? The NCERT Class 11 Biology Chapter 1 Notes help you understand this clearly and simply. These notes have easy points, neat diagrams, and previous-year questions with answers so you can revise without stress. This chapter explains the features of living things, why classification is needed, and how scientific names are given, which is very useful for CBSE and entrance exams like NEET. It covers all key topics from the NCERT book. You can also use these NCERT Notes for quick last-minute revision.
In these NCERT Class 11 Biology Notes of Chapter 1, you will get short and clear explanations about taxonomy, features of living organisms, and how we group them. These notes also help you to know how to write answers properly in exams. They help you understand examples and definitions better with diagrams. The points are arranged properly with highlights and diagram suggestions so you can remember better. With these NCERT Notes for Class 11, you can feel confident to answer board or entrance exam questions easily.
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NCERT solutions for Class 11 Biology Chapter 1 The Living World
These notes help students understand Chapter 1 simply and clearly. They cover what makes something living, how living things are grouped, and the basics of scientific naming. The notes include short, easy-to-learn points with diagrams so students can follow and remember the topics better. By using these notes, students can study each section step by step and build a good base in biology for further chapters.
“Living” means those organisms that show some special features which nonliving things can’t.
The word biodiversity was first used by W. Rosen in 1985. Life on Earth is incredibly diverse, with millions of species inhabiting it.
Binomial nomenclature is the scientific system of naming organisms using two Latinized names introduced by Carl Linnaeus.
Taxonomic categories refer to the hierarchical system of classification used to organise and categorise living organisms based on their characteristics.
The kingdom is the highest and most inclusive tax economic category.
Phylum (in animals) or Division (in plants) is the next level of classification in which organisms are grouped based on major structural and functional similarities.
The class is a more specific taxonomic rank than Phylum or Division.
The order is a taxonomic category that groups related families together.
A family consist of related genera that share a significant number of characteristics.
The genus is one of the most crucial taxonomic categories.
Species is the most specific fundamental taxonomic category.
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Some of the questions which have come in past years from the chapter are given below:
Question 1. Which of the following is a defining characteristic of living organisms?
Option 1. Growth
Option 2. Ability to make sound
Option 3. Reproduction
Option 4. Response to external stimuli
Answer :
The other characteristic than the response to the stimuli might not be apparent for any time, but the response to the stimuli could be confirmed whenever required and thus can be considered as the defining characteristic of living organisms.
Hence, the answer is option (4), Response to external stimuli
Question 2. All living organisms are linked to one another because
Option 1. They have common genetic material of the same type
Option 2. They share common genetic material, but to varying degrees
Option 3. All have a common cellular organisation
Option 4. All of the above
Answer :
The theory of evolution proposes that all organisms have a common origin, and this is evident in their genetic material. Over time, variations in this genetic material attributed to mutation, natural selection, and many other evolutionary processes have resulted in the vast diversity of life we see today. Shared genetic heritage establishes the interconnection of all living organisms, showing how gradual evolutionary changes result in the appearance of new species with the retention of genetic properties.
Hence, the correct answer is Option 2. They share common genetic material, but to varying degrees
Question 3. Genus represents
Option 1. An individual plant or animal
Option 2. A collection of plants and animals
Option 3. Group of closely related species of plants and animals
Option 4. None of these
Answer :
Consider that the taxon species comes under the taxon genus. A genus is an aggregate of related species that are similar to each other in many correlated characteristics. The genus can be monotypic, i.e. having one species or polytypic, i.e. having many species. Genus Solanum possesses species like Solanum nigrum, Solanum tuberosum (potato), Solanum melongena (brinjal), etc.
Hence, the answer is option (3) Group of closely related species of plants and animals.
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The chapter-wise Notes for class 11 biology are given below:
The main topics covered in the NCERT Book are: definition of living, different characteristics of life, diversity of the living world, different taxonomic categories and various taxonomic aids are given shortly in the NCERT Class 11 Biology chapter 1 notes.
The NCERT Class 11 biology chapter 1 Living world is in the scope of the CBSE Board Exam as well as in NEET. In the CBSE Board Exam, students can expect 4 to 6 marks questions from the chapter living world. With the help of notes for Class 11 Biology chapter 1, they will be able to revise all the main topics. The Living World Class 11 notes Biology chapter 1 notes pdf download is available to the students.
We can express Biodiversity as the variety among living beings coming from different ecosystems as well as variations in the levels of genetic, morphological, anatomical etc.
The critical properties of living are—
A living organism shows growth and development which is permanent.
The cellular organisation is observed in living beings.
Metabolism takes place in the cells of living organisms.
A living organism is capable of reproduction and thus creates future generations.
A living being shows responses toward internal or external stimuli.
A group of organisms with one or more common features are placed at a specific level in the hierarchy of classification. This group is called a taxon (plural: taxa). For example, all the birds are placed in class Aves which is a taxon. Similarly, genus, species, family etc., are all examples of taxa.
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