NCERT Solutions for Class 11 Biology Chapter 1

The Living World Class 11

Chapter 1 The Living World Exercise Solutions

Next Chapter 2 : Biological Classification >>

Exercise : Solutions of Questions on Page Number : 15

Q1 :  

Why are living organisms classified?


Answer :

A large variety of plants, animals, and microbes are found on earth. All these living organisms differ in size, shape, colour, habitat, and many other characteristics. As there are millions of living organisms on earth, studying each of them is impossible. Therefore, scientists have devised mechanisms to classify all living organisms. These methods of classification are based on rules and principles that allow identification, nomenclature, and finally classification of an organism.

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.

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Q2 :  

Why are the classification systems changing every now and then?


Answer :

Millions of plants, animals, and microorganisms are found on earth. Many of these have been identified by the scientists while many new species are still being discovered around the world. Therefore, to classify these newly discovered species, new systems of classification have to be devised every now and then. This creates the requirement to change the existing systems of classification.

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Q3 :  

What different criteria would you choose to classify people that you meet often?


Answer :

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Q4 :  

What do we learn from identification of individuals and populations?


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Q5 :  

Given below is the scientific name of Mango. Identify the correctly written name.

Mangifera Indica

Mangifera indica


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Q6 :  

Define a taxon. Give some examples of taxa at different hierarchical levels.


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Q7 :  

Can you identify the correct sequence of taxonomical categories?

(a) Species → Order → Phylum → Kingdom

(b) Genus → Species → Order → Kingdom

(c) Species → Genus → Order → Phylum


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Q8 :  

Try to collect all the currently accepted meanings for the word 'species'. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand and bacteria on the other hand.


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Q9 :  

Define and understand the following terms:

(i) Phylum (ii) Class (iii) Family (iv) Order (v) Genus


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Q10 :  

How is a key helpful in the identification and classification of an organism?


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Q11 :  

Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.


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Next Chapter 2 : Biological Classification >>

Biology : CBSE NCERT Exercise Solutions for Class 11th for The Living World will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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