Diversity In Living Organisms Class 9 NCERT Solutions

Diversity In Living Organisms Class 9 NCERT Solutions is the 7^th chapter of Biology part of NCERT Science books which covers all topics and subtopics. In 9th standard, we have to do hard work because next, you will be in 10 board class. So Science Chapter  Diversity In Living Organisms Class 9 NCERT Solutions will help you a lot.

 Diversity In Living Organisms Class 9 NCERT Solutions

Table of Contents

1.   Chapter Overview

2.   Questions- Answers

3.   Exercise Question -answers

4.   Important points

5.   Important Facts

6.   Important Terms

7.   Oral questions- answers

8.   Suggested topics

 

Diversity In Living Organisms Class 9 NCERT Solutions

 

Diversity In Living Organisms Class 9 NCERT Solutions is completely based on the CBSE syllabus so you will be able to find complete NCERT solutions for class 9 science Chapter 7 Diversity in Living Organisms.

NCERT Solutions for Class 9 Science Chapter 7

You must know the topics and subtopic of NCERT Solutions for Class 9 Science Chapter 7 before you go through NCERT Solutions for Class 9 Science Chapter 7

 

Diversity In Living Organisms Class 9 NCERT Solutions Overviewdes1

1.   What is the Basis of Classification?

2.   Classification and Evolution

3.   The Hierarchy of Classification Groups

4.   Plantae

5.   Animalia

 

Students of CBSE affiliated schools and, RBSE and  other states can download Solutions of Chapter7 Diversity in Living Organisms.

Solutions of Chapter 7 Diversity in Living Organisms of NCERT Science for Class 9 Intext questions

 

Diversity In Living Organisms Class 9 NCERT Solutions Question- Answersdes2

 

Intext Questions

Diversity In Living Organisms Class 9 NCERT Solutions Page No. 80

Q.1  Why do we classify organisms?

Ans. We classify organisms because:

1. It makes the study of such a wide variety of organisms easy.

2. It helps in the identification of organisms.

3. It is useful to identify similarities and dissimilarities amongst organisms. 

4. It is essential to understand the inter-relationship among different groups of organisms.

5. It also serves as a base for the development of other sciences e.g., biogeography, etc.

 

Q.2  Give three examples of the range of variations that you see in life forms around you.

Ans.   The range of variations we see in life forms around us are:

1.   Size: The living organisms vary in size from a few micrometers (e.g. bacteria) to more than 30 meters long (e.g., blue whale) and more than 100 meters tall trees.

2.   Life Span: The living organisms vary in longevity from a day (fly) to several thousand years (pine trees).

3.   Colours : Different types of colors are found. Worms and several jellyfishes are colorless whereas flowers and birds are brightly colored.

 

Diversity In Living Organisms Class 9 NCERT Solutions Page No. 82

Q.1 Which do you think is a more basic characteristic for classifying organisms?

   (a)   The place where they live

    (b)   The kind of cells they are made of. Why?

Ans.  The more basic characteristic for classifying organisms is – (b) the kind of cells they are made of. Because if we classify them on the basis of ‘place where they live’ then it can be very misleading.

     For example, animals living in water include corals, octopuses, fishes, whales, etc. But we see that the above organisms belong to different groups and are different from each other in many ways.

 

Q.2 What is the primary characteristic on which the first division of organisms is made?

Ans. The primary characteristics are the type of cells, i.e., prokaryotic (genetic material is not enclosed by a membrane) and eukaryotic (genetic material is enclosed by a membrane).

 

Q.3On what bases are plants and animals put into different categories?

Ans.  Plants and animals have been put into different categories on the following basis –

(i)    Plants are stationary whereas animals are motile.

(ii)Plants grow continuously whereas animals stop growing after attaining a certain size

(iii)   Plants are autotrophic whereas animals are heterotrophic.

(iv)      Plant cells have a cell wall around them whereas animal cells lack a cell wall.

 

Diversity In Living Organisms Class 9 NCERT Solutions Page No. 83

Q.1  Which organisms are called primitive and how are they different from the so-called advanced organisms?

Ans. Those organisms which have simple cellular structures and ancient body designs with the only basic characteristics of the group are called primitive organisms.

      Advanced organisms are more recent organisms. They possess several specializations and have a more complex structures and some new characteristics.

 

Q.2Will advanced organisms will be the same as complex organisms? Why?

Ans. Yes, an advanced organism will be the same as a complex organism. Complexity in design increases over evolution.

 

Diversity In Living Organisms Class 9 NCERT Solutions Page No. 85

 

Q.1  What is the criterion for the classification of organisms belonging to kingdom Monera or Protista?

Ans.On the basis of the presence or absence of a well-defined nucleus . The organisms which do not have well-defined nuclei, membrane-bound cell organelles, and multicellular body designs are grouped under the kingdom Monera. The organisms which are unicellular and eukaryotic are grouped under the kingdom Protista.

 

Q.2  In which Kingdom will you place an organism that is single-celled, eukaryotic, and photosynthetic?

Ans.    Kingdom   Protista.

 

Q.3  In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and which will have the largest number of organisms.

Ans. The organisms belonging to kingdom Monera will have the smallest number of organisms with a maximum of characteristics in common. And kingdom Animalia will have the largest number of organisms.

 

Diversity In Living Organisms Class 9 NCERT Solutions Page No. 88

 

Q.1  Which division among plants has the simplest organisms?

Ans.    Thallophyta (algae)

 

Q.2  How are pteridophytes different from phanerogams?

Ans. 1. Pteridophytes do not produce seeds whereas phanerogams produce seeds.

  2. Pteridophytes have naked embryos and inconspicuous reproductive organs whereas Phanerogams have covered embryos and well-differentiated reproductive organs.

Q.3  How do gymnosperms and angiosperms differ from each other?

Ans.  Gymnosperms are plants whose seeds are not enclosed in fruits (naked seeds) whereas Angiosperms are plants whose seeds are enclosed by a fruit.

 

Diversity In Living Organisms Class 9 NCERT Solutions Page No. 94

 

Q.1  How do Porifera animals differ from coelenterate animals?

Ans.       

 

 

Porifera	Coelenterate
They have cellular level of organization.	They have tissue level of organization.
They don’t have coelom.	They have coelom.
They have hard outer skeleton.	They don’t have skeleton.
They have very minimal differentiations.	They have more differentiations.

 

            

 

Q.2  How do Annelid animals differ from arthropods?

 

 

Ans.

Arthropoda	Annelida
They have segmented body into head, thorax and abdomen.	They have segmented body into rings.
They may be unisexual or bisexual.	They are bisexual.
They have outer skeleton.	They have no skeleton.

 

             

Q.3  What are the differences between amphibians and reptiles?

Ans.       

Amphibia	Reptilia
They respire through skin or lungs.	They respire through lungs.
They can jump.	They crawl.
They develop into adult through an intermediate stage called tadpole.	They have no intermediate stage.
They have moist skin with mucous gland.	They have hard skin with scales.

 

            

 

Q.4  What are the differences between animals belonging to the Aves group and those in the Mammalia group?

Ans.       

Aves	Mammalia
They have feathers on body.	They have hairs on boy.
They have beak but don’t have teeth.	Teeth are present but beak absent.
They have streamlined body.	Their body is not streamlined.
Forelimbs are modified into wings to fly.	They have no wings.
They have hollow bones.	They have hard bones.

 

        

 Diversity In Living Organisms Class 9 NCERT Solutions End Exercise Question- Answersdes3   

 Q.1  What are the advantages of classifying organisms?

  Ans.

 i.  It makes the study of such a wide variety of organisms easy.

ii.       It helps in the identification of organisms.

iii.  It is useful to identify similarities and dissimilarities amongst organisms. 

iv.   It helps in cross-breeding and genetic engineering.

v.     It is essential to understand the inter-relationship among different groups of organisms.

vi.  It also serves as a base for the development of other sciences e.g., biogeography.

vii.       It helps in studying scientific research.

 

Q.2  How would you choose between two characteristics to be used for developing a hierarchy in classification?

Ans.  The character which is of fundamental importance and present in a large number of organisms, as a change in body design, is used in raising a higher category. The less important character, generally present in a smaller number of individuals is used for raising the lower category.

 

Q.3  Explain the basis for grouping organisms into five kingdoms.

Ans.  The basis for grouping organisms into kingdoms are, whether 

(i)       They are made of prokaryotic or eukaryotic cells.

(ii) The cells are living singly or organized into multi-cellular and thus complex organisms. 

(iii)    They manufacture their own food or not.

(iv)     The cells have a cell wall or not.

Q.4 What are the major divisions in Plantae? What is the basis for these divisions?

Ans. The major divisions in the Plantae are –

Division	Basis of classification
Thallophyta	Thallus like body
Bryophyte	Body is divided into leaf and stem
Pteridophyta	Body is divided into leaf, stem and root.
Gymnosperm	Seed bearing but naked seeds
Angiosperm	Seed bearing but covered seeds

 

          

 

Q.5  How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?

Ans.  The criteria for deciding division in plants is based on whether they bear seeds or not, whether the plant body has well-differentiated, distinct components or not.

        It is different from the criteria for deciding the subgroup among animals because animals are divided on the basis of their cell and body organization, symmetry, presence or absence of body cavity or coelom, and notochord.

 

Q.6  Explain how animals in Vertebrata are classified into further subgroups.

Ans. The main characteristics used to classify animals in Vertebrata are –

(i)        The type of endo or exoskeleton.

(ii)       Locomotary organs fins/limbs.

(iii)    The mode of reproduction and giving birth to young ones.

  On the basis of the above characters the Vertebrata is divided into the following classes:

1.   Pisces: Exoskeleton of scales; endoskeleton of bones or cartilage; breathing through gills.

2.   Amphibia: Skin slimy; breathing through gills only in larva  but through skin and lungs in adults

3.   Reptilia: Exoskeleton of scales; laying eggs outside the water.

4.   Aves:  feathers; lay eggs, flight possible. Forelimbs are modified into wings to fly.

5. Mammalia: Exoskeleton of hairs; external ears, give birth to young ones. Mammary glands are present

diversity in Living Organisms Class 9 NCERT Solutions Important Pointsdes4

You have read the Diversity In Living Organisms Class 9 NCERT Solutions, below you have been given some important points of Diversity In Living Organisms Class 9 NCERT Solutions that will help you understand the whole chapter 7.

 

     1.   Classification helps us in exploring the diversity of life forms.

    2.   The major characteristics considered for classifying all organisms into five major kingdoms

     a.   Whether they are made of prokaryotic or eukaryotic cells.

    b.   Whether the cells are living singly or organized into multicellular and thus complex organisms.

    c.   Whether the cells have a cell wall and whether they prepare their own food.

   3.   All living organisms are divided on the above bases into five kingdoms - Monera, Protista, Fungi, Plantae, and Animalia.

     4.   The classification of life forms is related to their evolution.

    5.   Plantae and Animalia are further divided into subdivisions on the basis of increasing completely body organisation.

   6.   Plants are divided into five groups- Thallophytes, Bryophytes, Pteridophytes, Gymnosperm and Angiosperm.

  7. Animals are divided into ten groups- Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Protochordata, Vertebrata.

  8. The binomial nomenclature makes for a uniform way of identification of the vast diversity of life around us.

    9. The binomial nomenclature is made up of two words- a generic name and a specific name.

 Related Searches for You

 NCERT Solutions for Class 9 Science All Chapters below

Chapter 1 Matter in Our Surroundings

Chapter 2 Is Matter Around Us Pure

Chapter 3 Atoms and Molecules  

Chapter 4 Structure of The Atom

Chapter 5 The Fundamental Unit of Life

Chapter 6 Tissues

Remedial Education Point.com provides you complete study material for class 9 absolutely free. Now you can get accurate Diversity In Living Organisms Class 9 NCERT Solutions prepared by our expert teachers.