File Name: class 9 chapter 7 science diversity in living organisms question and answer in .zip
Solutions are available in Hindi Medium as well as English Medium format. Thallophytes body is not well differentiated, no vascular tissue present, usually contain green pigment and have cell wall made up of cellulose. Spirogyra, Ulva are thallophytes and are aquatic. Aves: a They lay eggs. Mammalia: a They give birth to young ones.
The chapter focuses on the basic characteristics used to classify plants and animals along with some concrete examples of characteristics used for their hierarchical classification. Subsequently, the chapter, Diversity in Living Organisms focuses on the concept of classification and evolution and how both of them are interconnected. Information on the term biodiversity is also provided. Further, the hierarchy of classification is explained where the different levels of classification are discussed.
The factors on the basis of which the classification is made are explained in the chapter, Diversity in Living Organisms.
Thereafter, the important characteristics of 5 kingdoms of Whittaker are discussed under the labels :. The kingdom of Plantae is further sub-classified into T hallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms.
Each of these classifications is explained in detail along with their structure, functions and examples. The last part of the chapter, Diversity in Living Organisms deals with the nomenclature of organisms based on the scheme provided. The chapter, Diversity in Living Organisms is covered under the following sections - 7. These life forms have existed and evolved on the Earth over millions of years ago. The huge range of these life forms makes it very difficult to study them one by one.
Therefore, we look for similarities among them and classify them into different classes to study these different classes as a whole. Thus, classification makes our study easier. For example, a crow lives for only 15 years, whereas a parrot lives for about years. The kind of cells that living organisms are made up of is a more basic characteristic for classifying organisms, than on the basis of their habitat. This is because on the basis of the kind of cells, we can classify all living organisms into eukaryotes and prokaryotes.
On the other hand, a habitat or the place where an organism lives is a very broad characteristic to be used as the basis for classifying organisms. For example, animals that live on land include earthworms, mosquitoes, butterfly, rats, elephants, tigers, etc.
These animals do not resemble each other except for the fact that they share a common habitat. Therefore, the nature or kind of a cell is considered to be a fundamental characteristic for the classification of living organisms.
The primary characteristic on which the first division of organisms is made is the nature of the cell. It is considered to be the fundamental characteristic for classifying all living organisms. Nature of the cell includes the presence or absence of membrane-bound organelles. Therefore, on the basis of this fundamental characteristic, we can classify all living organisms into two broad categories of eukaryotes and prokaryotes. Then, further classification is made on the basis of cellularity or modes of nutrition.
Video Solution for diversity in living organisms Page: 82 , Q. Plants and animals differ in many features such as the absence of chloroplasts, presence of cell wall, etc.
But, locomotion is considered as the characteristic feature that separates animals from plants. This is because the absence of locomotion in plants gave rise to many structural changes such as the presence of a cell wall for protection , the presence of chloroplasts for photosynthesis etc. Hence, locomotion is considered to be the basic characteristic as further differences arose because of this characteristic feature.
Which organisms are called primitive and how are they different from the so-called advanced organisms? A primitive organism or lower organism is the one which has a simple body structure and ancient body design or features that have not changed much over a period of time. An advanced organism or higher organism has a complex body structure and organization.
For example, an Amoeba is more primitive as compared to a starfish. Amoeba has a simple body structure and primitive features as compared to a starfish. Hence, an Amoeba is considered more primitive than a starfish. It is not always true that an advanced organism will have a complex body structure.
But, there is a possibility that over the evolutionary time, complexity in body design will increase. Therefore, at times, advanced organisms can be the same as complex organisms. What is the criterion for classification of organisms as belonging to kingdom Monera or Protista?
The criterion for the classification of organisms belonging to kingdom Monera or Protista is the presence or absence of a well-defined nucleus or membrane-bound organelles.
Kingdom Monera includes organisms that do not have a well-defined nucleus or membrane-bound organelles and these are known as prokaryotes. Kingdom Protista, on the other hand, includes organisms with a well-defined nucleus and membrane-bound organelles and these organisms are called eukaryotes.
In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic? 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?
In the hierarchy of classification,a species will have the smallest number of organisms with a maximum of characteristics in common, whereas the kingdom will have the largest number of organisms. Thallophyta is the division of plants that has the simplest organisms.
This group includes plants, which do not contain a well differentiated plant body. Their body is not differentiated into roots, stems, and leaves.
They are commonly known as algae. What are the differences between animals belonging to the Aves group and those in the mammalia group? Some of them lay eggs and some give birth to young ones. Hence, they are both oviparous and viviparous. There are a wide range of life forms about 10 million million species around us. Therefore, we look for similarities among them and classify them into different classes so that we can study these different classes as a whole.
This makes our study easier. How would you choose between two characteristics to be used for developing a hierarchy in classification? For developing a hierarchy of classification, we choose the fundamental characteristic among several other characteristics.
For example, plants differ from animals in the absence of locomotion, chloroplasts, cell wall, etc. But, only locomotion is considered as the basic or fundamental feature that is used to distinguish between plants and animals.
This is because the absence of locomotion in plants gave rise to many structural changes such as the presence of a cell wall for protection, and the presence of chloroplast for photosynthesis as they cannot move around in search of food like animals. Thus, all these features are a result of locomotion. Therefore, locomotion is considered to be a fundamental characteristic. By choosing the basic or fundamental characteristic, we can make broad divisions in living organisms as the next level of characteristic is dependent on these.
This goes on to form a hierarchy of characteristics. This division lead to the formation of kingdom Monera, which includes all prokaryotes. Unicellular eukaryotes form kingdom Protista, and multicellular eukaryotes form kingdom Fungi, Plantae, and Animalia. Fungi have saprophytic mode of nutrition, whereas plants have autotrophic mode of nutrition. This results in the formation of the five kingdoms.
The kingdom Plantae is divided into five main divisions: Thallophyta, Bryophyta, Pteridophyta, Gymnosperms, and Angiosperms. A group of plants that do not have a well differentiated plant body are known as Thallophyta. Plants without specialised vascular tissues are included in division Bryophyta, whereas plants with vascular tissues are known as Tracheophyta.
This group is further sub- divided on the basis of whether the seeds are naked or enclosed in fruits. This classifies them into gymnosperms and angiosperms. Gymnosperms are seed bearing, non-flowering plants, whereas angiosperms are flowering plants in which the seeds are enclosed inside the fruit.
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals? Kingdom Animalia is divided into two major groups on the basis of the presence or absence of a notochord. Non-chordates do not possess a notochord, while all members of the phylum chordates possess a notochord. On the basis of the above features, non-chordates are divided into the following subgroups: Porifera, Coelenterate, Platyhelminthes, Nematodes, Annelids, Molluscs, Arthropoda, and Echinodermata.
All members of the phylum chordate possess a notochord. However, some animals such as Balanoglossus, Amphioxus, Herdmania, etc. Therefore, these animals are kept in a separate sub-phylum called Protochordata, and the rest of the chordates are included in the sub-phylum vertebrata.
The members of the sub-phylum vertebrata are advanced chordates. These animals mostly live in water. Hence, they have special adaptive features such as a streamlined body, presence of a tail for movement, gills, etc. These animals have a dual mode of life. In the larval stage, the respiratory organs are gills, but in the adult stage, respiration occurs through the lungs or skin.
They lay eggs in water. They usually creep or crawl on land. The body of a reptile is covered with dry and cornified skin to prevent water loss. They lay eggs on land. Most of them have feathers. Their forelimbs are modified into wings for flight, while hind limbs are modified for walking and clasping. They lay eggs.
Some lay eggs and some give birth to young ones. Their skin has hair as well as sweat glands to regulate their body temperature. Page No Question 1: Why do we classify organisms?
Video Solution for diversity in living organisms Page: 80 , Q.
This solution contains questions, answers, images, step by step explanations of the complete Chapter 7 titled Diversity in Living Organisms of Science taught in class 9. After you have studied lesson, you must be looking for answers of its questions. For a better understanding of this chapter, you should also see Chapter 7 Diversity in Living Organisms Class 9 notes , Science. In-Text Questions Solved. Why do we classify organisms? Question 2. Give three examples of the range of variations that you see in life-forms around you.
In which the reproductive organs are hidden? Which phylum of animals is also called flatworms? Nematoda 3. What is the exclusive marine phylum? Protozoa 4. What is not possessed by bacteria?
Class 9 Science Chapter 7 Exercise – Questions with Answer page Q1. Why do we classify organisms? Ans: By classifying organisms, it is.
Chapter 1 - Matter in Our Surroundings. Chapter 2 - Is Matter Around us Pure. Chapter 3 - Atoms and Molecules.
The chapter focuses on the basic characteristics used to classify plants and animals along with some concrete examples of characteristics used for their hierarchical classification. Subsequently, the chapter, Diversity in Living Organisms focuses on the concept of classification and evolution and how both of them are interconnected. Information on the term biodiversity is also provided.
CBSE Class 9 Science (Biology) Chapter 7 Diversity in Living Organisms Exercise Questions with Solutions to help you to revise complete RD Sharma Class 12 Solutions · RD Sharma Class 11 Solutions Free PDF Download If you are a student of class 9 who is using NCERT Textbook to study Science, then you must.
The solutions provided here are as per the NCERT textbooks with all the exercises and in-text questions along with answers. Chapter 7 of Science book for Class 7 deals with various types of living organisms, which lays the foundation for learning the plant and animal kingdom in future classes. Here, you will get the step-by-step answers to all exercise questions that you can view on this page as well as download as a PDF. Chapter 7 Science Class 9 deals with diversity in living organisms. In this chapter, you will learn about the classification of living organisms. You will study each classification i. This discussion will be followed by the topic — Nomenclature.
Each organism is different from all other organisms. Greek thinker Aristotle classified animals according to whether they lived on land, in water or in air. This classification is a landmark in ideology, but has limitations. In fact they are different from each other. Classification and Evolution: organisms are classified based on body design, hierarchy in developing, relation to evolution.
Topics covered in the chapter diversity in the living organisms are - Diversity in the living organisms, Basis of classification, classification and evolution, Hierarchy of classification, Plantae, and Animalia. When different organisms stay in the same ecosystem or geographical location is known as diversity.
Question 1. Why do we classify organisms? Question 2. Which do you think is a more basic characteristic for classifying organisms?
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