NCERT Solutions for Class 9 Science Chapter 7 - Diversity In Living Organisms

1. Will advanced organisms be the same as complex organisms? Why?

Ans: Yes, the advanced organisms are the same as complex organisms because complexity in body structure increased with evolution due to different adaptations, therefore the body structure of advanced organisms is different from the primitive one and the advanced organisms or complex organisms are the same.l

2. In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic.

Ans: The characteristics like a single cell, eukaryotic and photosynthetic are shown by Kingdom Protista, Therefore the organisms with all these characteristics will place under the Kingdom Protista.

3. Which division among plants has the simplest organisms?

Ans:  Among plants, 

• Thallophyta division shows the simplest form of organisms.

• It does not have a well-differentiated body like other plants and it is not differentiated into root, stem and leaves.

4. Why do we classify organisms?

Ans: We classify organisms as:-

• Due to the diversity present between different organisms, classification of organisms is necessary to differentiate between their characteristics and function. 

• A single kingdom consists of varieties of species that show different characteristics. So, it will be very difficult to study each of the species one by one from 30 million species. 

Therefore, scientists felt the need of grouping different species based on some observable similar characters. Classification of organisms also helps to find out evolutionary relationships between different organisms.

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

1. The place where they live.

2. The kind of cells they are made of. Why?

Ans: (b) The kind of cells they are made up of. 

1. Living organisms are mainly differentiated into five-kingdom classifications in which one of the classifications is based on the type of cells. It may be eukaryotes or pork.

2. A eukaryotic cell has membrane-bound organelles, including a nucleus, which allows cellular processes to be carried out efficiently which differ from each other. 

6. What is the primary characteristic on which the broad division of organisms is made?

Ans: (1) The primary characteristic on which the broad division of organisms is made is the Nature of the cell.

(2) The nature of the cell characteristic mainly includes the presence or absence of membrane-bound cell organelles from small single-cell bacteria to large multicellular living organisms.

Therefore based on the nature of the cell the organisms are divided into prokaryotes and eukaryotes.

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

Ans: When we connect the idea of evolution to classification, we find two groups of organisms. 

(1) The first group has few organisms which are also known as lower organisms and primitive because their body structure is simple and has not changed many e.g. primitive protozoans.

(2) The second group has organisms that have acquired particular body designs by accumulating changes over some time like complex body structure therefore they are known as higher organisms or complex organisms. For example, it includes all eukaryotes. 

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

Ans: Based on cell structure, the criterion for classifying organisms belonging to the kingdom Monera or Protista:-

(1) Kingdom Monera consist of prokaryotic organisms that do not have a well-defined nucleus or membrane-bound organelles nor do they have cellulose cell walls.

(2) Kingdom Protista, on the other hand, are eukaryotes that include organisms with a well-defined nucleus and membrane-bound organelles with the presence of cellulosic cell walls in some organisms.

9. 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: In the hierarchy of classification each step is represented by rank or category which start from species and ends on the kingdom.

(1)The species group consists of the smallest number of organisms with the maximum characteristic in common.  Therefore it is easy to distinguish one species from another.

(2)The kingdom group has the largest number of organisms with different characteristics shown by different types of organisms. Therefore, in the case of a kingdom, it is difficult to determine the relationship between different groups of organisms.

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

Ans: Hierarchy of classification starts from species and ends on the kingdom. The main fundamental characteristics help in the differentiation of organisms based on their structure and functions. Like,

1. Classification based on characteristics of the cell, like prokaryotes do not have a membrane-bound nucleus and whereas eukaryotes have a membrane-bound nucleus and cell organelles.

2. Classification based on the number of cells includes organisms into unicellular which is made up of single cells or multicellular which is made up of numbers of cells.

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

Ans: (1) Kingdom Plantae has been classified into mainly five major divisions which include, Bryophyta, Thallophyta, Gymnosperms, Pteridophyta, and Angiosperms.

(2)The five groups of plants are classified based on the following criteria:

Plant bodies that are differentiated or undifferentiated, vascular tissues that are present or absent, and plants with or without seeds; if seeds are present, they may be bare or inside the fruit.

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

Ans: (1)Plants are divided based on criteria like - Differentiated or Undifferentiated plant body, presence or absence of specialised vascular tissues, with or without seeds and if seeds are present it may be naked seeds or present inside fruits

(2)In animals, a division is broadly based on the presence or absence of a notochord, level of organisation, number of cells etc.

13. Give three examples of the range of variations that you see in life-forms around you.

Ans: Examples observed in daily life are:

1. Size- Different organisms show different sizes and it ranges from small bacteria to giant trees or giant animals.

2. Appearance- Colour and texture of the skin, size and shape of the body and other characteristics in different animal species are completely different from each other.

3. Mode of Nutrition- The main modes of nutrition in animals and plants are heterotrophic and autotrophic which are further divided into different forms. Different organisms show different modes of nutrition due to their different types of body structure and functions.

14. On what basis are plants and animals put into different categories?

Ans: Plants and animals are different due to many features like:

1. Chloroplasts-It is the main characteristic feature of plants because plants perform photosynthesis with the help of chloroplast whereas animals do not perform photosynthesis therefore chloroplasts are absent in their cells.

2. Cell wall- Plants consist of a cell wall around their cell surface because it protects itself from wear and tear due to environmental stress whereas an animal does not due to flexibility movement by their body. 

3. The mode of nutrition is also considered as the characteristic feature that differentiates animals from plants. They can be classified into - Heterotrophs (Animals) which depend on other organisms for their food and Autotrophs (plants) which make their food. 

15. How are pteridophytes different from phanerogams?

Ans: Difference between pteridophytes and phanerogams:

16. How do gymnosperms and angiosperms differ from each other?

Ans: Difference between Gymnosperm and Angiosperm:

17. How do poriferan animals differ from coelenterate animals?

Ans: Difference between Porifera and Coelenterata:

18. How do annelid animals differ from arthropods?

Ans: Difference between Annelids and Arthropods:

19. What are the advantages of classifying organisms?

Ans: Advantages of classifications are,

(1) It makes the study of groups of organisms easy because due to high diversity it is impossible to study organisms one by one.

(2) The diversity not only includes different organisms but also is present between different individuals of the same organism.

(3)Classification helps in grouping different species based on some observable similar characters and the Classification also helps in the identification and study of their evolutionary relationships.

20. What are the differences between amphibians and reptiles?

Ans: Difference between Amphibian and Reptiles:-

21. What are the differences between animals belonging to the Aves group and those in the mammalian group?

Ans: Differences between animals belonging to the Aves group and those in the mammalian group:-

22. Explain the basis for grouping organisms into five kingdoms.

Ans: 

(1) Many botanists and zoologists have done many attempts for the classification of living organisms based on different characteristics. Out of all, the five-kingdom classification done by R.H Whittaker (1969) is widely accepted and used even today. 

(2) The five kingdoms' classification divide organisms into monera, protista, fungi, Plantae and Animalia based on the different characteristics.

(3) The different characteristics of organisms that differentiate the five kingdoms are:

• Cell Type- Based on the structure of the cells are divided into prokaryotes and eukaryotes. 

• Cell Wall- It differentiates organisms based on the presence or absence of cellulosic cell wall. 

• Nuclear Membrane- Some organisms show the presence of nuclear membrane enclosing nucleus whereas some organisms like monerans do not have a membrane-bound nucleus.

• Body Organisation- It is based on the number of cells like some show cellular level of organisation, some have tissue level of the organisation while higher animals have organ level of organisation.

• Mode of Nutrition- Based on the nutrition they are classified into autotrophs and heterotrophs.

23. Explain how animals in Vertebrates are classified into further subgroups.

Ans: Animals in Vertebrata are classified into the following subgroups - 

1. Pisces- Show presence of exoskeleton of scales, endoskeleton of bone and cartilage and breathing take place through gills.

2. Amphibia- It has the presence of gills in the larval stage which get modified into lungs in the adult stage whereas skin in amphibians is slimy.

3. Reptilia- It has the presence of dry skin, scales and scutes which make the skin surface rough and it lays eggs outside water.

4. Aves- Exoskeleton consists of feathers, show flight movement and mostly lay eggs.

5. Mammalia- Exoskeleton consists of hair, external ears and mammary glands are present. It gives birth to young ones.

NCERT Solutions for Class 9 Science Chapter 7 - Diversity in Living Organisms

You can opt for Chapter 7 - Diversity in Living Organisms NCERT Solutions for Class 9 Science PDF for Upcoming Exams and also You can Find the Solutions of All the Maths Chapters below.

NCERT Solutions for Class 9 Science

• Chapter 1 - Matter in Our Surroundings

• Chapter 2 - Is Matter Around us Pure

• Chapter 3 - Atoms and Molecules

• Chapter 4 - Structure of Atom

• Chapter 5 - The Fundamental Unit of Life

• Chapter 6 - Tissues

• Chapter 7 - Diversity in Living Organisms

• Chapter 8 - Motion

• Chapter 9 - Force and Laws of Motion

• Chapter 10 - Gravitation

• Chapter 11 - Work and Energy

• Chapter 12 - Sound

• Chapter 13 - Why do We Fall ill

• Chapter 14 - Natural Resources 

• Chapter 15 - Improvement in Food Resources

NCERT Solutions For Class 9 Science Chapter 7 PDF

Students usually face difficulties in Class 9 Chapter 7 and to overcome these difficulties, one must download Diversity in Living Organisms Class 9 NCERT PDF for making the preparation for final exams easier. The complexity of Ch 7 Science Class 9 is eased with the practical explanation of  NCERT Solutions for Class 9 Science Chapter 7.  Diversity in Living Organisms Class 9 solutions is prepared by teachers who are experts in these subjects and have work experience of many years thus ensuring students that the quality of the solutions is good and trustable. The solutions of Class 9th Science Chapter 7 are prepared based upon the pattern prescribed by CBSE. Class 9 ch 7 Science is made simpler with NCERT.

NCERT Solutions For Class 9 Science Chapter 7

Class 9 Science Chapter 7 Diversity in Living Organisms comes under unit II of the syllabus that is named as The Fundamental Unit of Life. This unit mainly focuses on the part of life that is somewhat related to Science. NCERT Solutions for Class 9 Science Diversity in Living Organisms tries to explain the importance of various groups to understand the importance of life forms. Through NCERT Solutions for Class 9 Science Chapter 7, students gain knowledge about the different broad groups of organisms. The answers included in the Diversity in Living Organisms NCERT Solutions give more clarity to students which helps them secure higher marks.

The hierarchical classification and evolution are well explained through the detailed content of the hierarchical classification. The hierarchy of classification includes groups such as Monera, Protista, Fungi, Plantae and Animalia. Students can learn all about these classifications thoroughly from NCERT Solutions for Class 9 Science Chapter 7 thus making their preparations more efficient. The above topics are explained in such a way that students will gain detailed knowledge of five-kingdom classification. 

The solutions help in getting a clear knowledge of this nomenclature concept. Class 9 Science Chapter 7 includes topics like Plantae. Under Plantae, students learn about Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms. All these topics are explained using diagrams which give students a clear view of all the topics that are included in this chapter.

Some other topics that students will learn from this chapter are Animalia, Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Protochordata and Vertebrata. The questions in these topics are solved using proper explanation. Thus, it will help students to relate to these topics of Diversity in Living Organisms.

The unit II Fundamentals Unit of Life holds 20 marks in the exams. So if a student is 100% accurate in this chapter, then he/she can secure the highest possible marks in the exams without any doubt. Students can prepare well with NCERT Solutions by formulating a proper plan for the studies. This solution gives a clear view of the chapter to students.

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