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NCERT Solutions for Class 11 Biology Chapter 1 – The Living World

NCERT Solutions for Class 11 Biology Chapter 1 – The Living World are a prerequisite for a clear understanding of the terminologies used in this chapter. Filled with a quality explanation, these solutions would assist in maximising your academic performance.  Chapter 1 of Biology introduces you to the concept of ‘living’ and meticulously explains the diversity in the living world. It further gives an account of the notion of taxonomy, its types and taxonomical aids

This chapter has 11 exercise questions. You can practice these questions and gain a better understanding of the chapter. If you have any doubts our NCERT Solutions will help you. A team of highly qualified professionals at Instasolv has prepared these solutions. With the point explanation, these solutions include a well-structured description of text to enable you to answer every question.

Important Topics for NCERT Solutions for Class 11 Biology Chapter 1 – The Living World

What is ‘Living’?

Some features of living organisms include growth, reproduction, metabolism, and emergence. Now, let’s discuss its features:

  • All living organisms demonstrate growth which includes proliferation in their mass and number. Through cell division, a multicellular and unicellular organism grows. 
  • Reproduction denotes producing lineage having similar characteristics to the parent organisms. Yeast and hydra reproduce through budding, Planaria through true regeneration, and fungi by fragmentation. In most of the unicellular organisms, the reproduction grows by the increase in the number of cells. 
  • Metabolism occurs inside the body of all living beings. Metabolism refers to all the chemical reactions occurring inside the body. 
  • Thus, living beings are self- replicating, evolving and have self- regulating features that can respond to external stimuli.

Diversity in the Living World

There are about 1.7-1.8 million species known to us. The number and types of organisms present on earth are called biodiversity. Millions of plants and animals are referred by local names from place to place. So, the demand for naming them on a standardised pattern arises. Nomenclature is the process of giving names to living organisms all over the world. The International Code for Botanical Nomenclature (ICBN) contains a set of rules and principles dealing with names for plants, while the International Code of Zoological Nomenclature (ICZN) deals with animals.

To name any organism, the biologists have acknowledged that each scientific name must contain two elements- the Generic name as well as the Specific Epithet. This whole process of naming is referred to as Binomial nomenclature. This system is developed by Carolus Linnaeus. Following are the other accepted rules of nomenclature:

  • Biological names are in Latin and are written in italics.
  • The first word is the genus while the second is a specific epithet.
  • If handwritten, then both words are separately underlined and in printing, it must be in italics.
  • Genus words start with a capital and the specific epithet starts with a small letter.

The name of the author is written after a specific epithet in abbreviated form.

To study all the living organisms, classification of them is very important. Classification is a process by which a thing is grouped into different categories.

All the living organisms can be classified into different categories which are called taxa. So, the process of classification is called taxonomy. The bases of taxonomy are characterisation, identification, classification, and nomenclature. This systematic arrangement of organisms is a branch of study called the systematics.

Taxonomic Categories

The classification contains various steps that show ranks or categories. The taxonomic arrangement contains categories as its overall part. The taxonomic hierarchy together contains all the categories. Each unit of classification is represented by a rank, generally called a ‘taxon’.

Due to the taxonomic studies, all the organisms have been placed in categories like kingdom, phylum, class, order, family, genus and species.

~Species: Where the individual organism exhibits similar fundamental features they are referred to as species. One species is different from others due to the morphological dissimilarities.

~Genus: A group of species that have more characteristics in common as compared to species of other genera is called a genus.

~Family: It is the group of related genera with less similar features as compared to genus and species. in plants, it is characterised on the basis of both vegetative and reproductive features.

~Order: The order is based on the aggregates of characters. It is the collection of families.

~Class: Class includes related order.

~Phylum: In animals, above the class, the next higher category is called the Phylum and in plants, it is called Division.

~Kingdom: The highest category of the various phyla of animals is called the Kingdom Animalia. All the plants from various divisions are assigned into the category known as the Kingdom Plantae.

Taxonomical Aids

To know about the bioresources and their diversity, taxonomic studies are carried out. Biologists have developed certain taxonomical aids which are as follows:

  • Herbarium: A storehouse where specimens of plants are dried, pressed and preserved on sheets. These sheets are placed as per the universal classification system.
  • Botanical Gardens: These gardens the plant species are grown for identification purposes and every plant possesses a label.
  • Museum: In educational institutes, the biological museum is set up. Specimens of animals and plants are preserved in jars in solutions or are stored in dried form.
  • Zoological Parks: Wild animals are kept in a protected environment under similar conditions to their natural habitats.
  • Key: The key is based on contrasting characters and is usually in pairs called a couplet.

Exercise Discussion of NCERT Solutions for Class 11 Biology Chapter 1 – The Living World

  • The first three questions of NCERT Solutions for Class 11 Biology chapter 1 are about classification.
  • After that, we have practical questions on identification.
  • Taxonomy and taxonomic hierarchy questions are also asked in the exercise. 
  • Few questions are there on definitions of phylum, class, family, order, and genus.

Now you don’t require any extra classes for clearing the doubts if there are any. Accompanying NCERT textbook with Instasolv NCERT solutions for class 11 biology chapter 1 would indeed produce satisfactory results for you to score good marks and have a firm grip in the Biology subject.