Diversity In Living Organisms

Learn Easily Foundation, Basics, important Solved Questions and Answers from CBSE NCERT Science Subject Class 9

Here you will learn the basics of Diversity In Living Organisms in a simple language it is for English/Hindi medium students who are studying under Central Board of Secondary Education CBSE and preparing for their Class 9 examinations. Here you will find all necessary and important CBSE Final Exams, Unit Exams, Term Exams Suggestions, notes, solved sample question paper in English along with video lectures from expert teachers

You will learn the basics and the foundation of this chapter in English medium from an expert teacher this module has been organised in four segments

  • In the first segment you are going to learn the foundation and basics of this chapter
  • In the second module you are going to learn the multiple choice questions that is MCQ or high order thinking skills question of 1 marks
  • In the third segment you are going to learn the short answers and questions which is typically asked from the chapter in your examination which is explained in very easy and simple method
  • The fourth segment comprises of long answers and questions which is typically of 5 to 6 marks which will help you prepare well for your examination you also get sample questions and sample paper for better preparation

If you have any questions please feel free to contact our team for details and help

এখানে আপনি Basic Terms, Definitions, Solved Short, Long Answers & Questions and MCQ's নিচে দেওয়া লিংকে ক্লিক করলে পেয়ে যাবেন

Subscribe to Get All Video Lectures, Study Material and Suggestions

If you have any questions please contact us so that we can help you. Subscribe to get all the video lectures, study material and suggestions.

Science Subject- It will be helpful for those who are preparing for the secondary examination of Central Board of Secondary Education CBSE. Here we will give you one Marks MCQ and Suggestion which will help you to prepare well in less time

VIDEO LECTURES BY EXPERT TEACHERS FOR EASY LEARNING

FOUNDATION - BASICS OF THE CHAPTER

MCQ QUESTIONS - 1 MARKS

SHORT QUESTIONS ANSWER - 3/4 MARKS

LONG QUESTIONS ANSWER - 5/6 MARKS

Definition, Important Terms, Explanation in Simple Words for Fast Learning

Biodiversity and classification 

 

Biodiversity means the diversity of life forms. It is a word commonly used to refer to the variety of life forms found in a particular region. 

Diverse life forms share the environment and are affected by each other too. As a result, a stable community of different species comes into existence.

 

Regions of megadiversity

The warm and humid tropical regions of the earth, between the tropic of Cancer and the tropic of Capricorn, are rich in diversity of plant and animal life. This is called the region of megadiversity. 

 

Of the biodiversity on the planet, more than half is concentrated in a few countries — Brazil, Colombia, Ecuador, Peru, Mexico, Zaire, Madagascar, Australia, China, India, Indonesia and Malaysia.

 

Classification

 

Greek thinker Aristotle classified animals according to whether they lived on land, in water or in the air. This is a very simple way of looking at life, but misleading too.

The method of arranging organisms into groups on the basis of their similarities and differences is called classification

 

 advantages of classification

  1.  it provides information regarding the existing diversity of plants and animals
  2.  it it creates a convenient environment to study a wide variety of organisms
  3.  it helps us understand  the process of evolution
  4.  it provides the basis for the development of other biological science like Ecology biochemistry and other disciplines of biology

 

Basis of classification

  •  The  complexity of cell structure
    • Eukaryotic cell –  the membrane-bound organelles are present along with the nucleus it efficiently allows the isolated cellular processes to be carried out
    •  Prokaryotic cell –  the membrane-bound organelles and a membrane-bound nucleus are absent
  •  The body structure
    • Unicellular-  having single cell;    amoeba
    •  Multicellular –  having a group of cells;  worm
  •  Mode of nutrition
    •  autotrophic organisms –  which can make their own food through the process of photosynthesis that is plants
    •  heterotrophic organisms –  which depends on autotrophic organisms and other animals for food
  •  Levels of organisation of the body
    •  
  •  Functional organisation

 

Classification and evolution

 

Evolution is a process by which early organisms on the earth diversifIED and developed into various forms through a slow and continuous process which helps in the development required for survival and growth

 

We will find some groups of organisms which have ancient body designs that have not changed very much. 

We will also find other groups of organisms that have acquired their particular body designs relatively recently. 

 

Those in the first group are frequently referred to as ‘primitive’ or ‘lower’ organisms, while those in the second group are called ‘advanced’ or ‘higher’ organisms.

 

Hierarchy of classification

Biologists, such as Ernst Haeckel (1894), Robert Whittaker (1969) and Carl Woese (1977) have tried to classify all living organisms into broad categories, called kingdoms

 

The classification Whittaker proposed has five kingdoms: 

Monera, Protista, Fungi, Plantae and Animalia, and is widely used. 

 

These groups are formed on the basis of their cell structure, mode and source of nutrition and body organisation.

 

The modification Woese introduced by dividing the Monera into Archaebacteria (or Archaea) and Eubacteria (or Bacteria) is also in use

 

Further classification is done by naming the sub-groups at various levels as given in the following scheme: 


  • Kingdom Phylum (for animals) / Division (for plants)
  •  Class 
  • Order
  •  Family
  •  Genus
  •  Species

 

By separating organisms on the basis of a hierarchy of characteristics into smaller and smaller groups, we arrive at the basic unit of classification, which is a ‘species’. 

 

So what organisms can be said to belong to the same species? 

Broadly, a species includes all organisms that are similar enough to breed and perpetuate.

 

The brief idea of the taxonomic categories are given below:

  •  Species
  •  GenUS
  •  Family
  •  order
  •  Class
  •  Phylum
  •  Kingdom

 

Five kingdom classification

  •  cell structure –  prokaryotic or Eukaryotic’
  •  modes and source of Nutrition –  autotrophic or heterotrophic
  •  body organisation –  unicellular or multicellular

 

The classification Whittaker proposed has five kingdoms: 

The important characteristics of these kingdoms are as follows

  1. Monera GK  monerEs- single
    1. These organisms do not have a defined nucleus or organelles
    2. do any of them show multi-cellular body designs
    3. The mode of nutrition of organisms in this group can be either by synthesising their own food (autotrophic) or getting it from the environment (heterotrophic).
    4. Some of them have cell walls while some do not. 
    5. Having or not having a cell wall has very different effects on body design here from having or not having a cell wall in multicellular organisms.
    6. This group includes bacteria, blue-green algae or cyanobacteria, and mycoplasma.
  2.  Protista – PROTISTS  –  primitive for the very first
    1. This group includes many kinds of unicellular eukaryotic organisms. 
    2. Their mode of nutrition can be autotrophic or heterotrophic.
    3. Some of these organisms use appendages, such as hair-like cilia or whip-like flagella for moving around.
    4. Examples are unicellular algae, diatoms and protozoans 
  3.  Fungi –  fungus –  mushroom
    1. These are heterotrophic eukaryotic organisms.
    2. Some of them use decaying organic material as food and are therefore called saprotrophs.
    3. Others require a living protoplasm of a host organism for food. They are called parasites.
    4. Many of them have the capacity to become multicellular organisms at certain stages in their lives
    5. They have cell walls made of a tough complex sugar called chitin. 
    6. Some fungal species live in permanent mutually dependent relationships with Bluegreen algae (or cyanobacteria). Such relationships are called symbiotic.
      1. These symbiotic life forms are called lichens. We have all seen lichens as the slow-growing large coloured patches on the bark of trees.
    7. Examples are yeasts, moulds and mushrooms
  4.  Plantae
    1. These are multicellular eukaryotes with cell walls.
    2. They are autotrophs and use chlorophyll for photosynthesis. Thus, all plants are included in this group.
    3. Unlimited growth and it continues till death
    4.  they are always fixed at one side and cannot move like animals
  5.  Animalia
    1. These include all organisms which are multicellular eukaryotes without cell walls. They are heterotrophs.
    2.  

 

Kingdom Plantae

The first level of classification among plants depends on whether the plant body possesses well-differentiated distinct cellular components or not

 

 CryptoGAMAE

 

 The thallophytes, bryophytes and pteridophytes do not have external flowers or seeds and have naked embryos called Sports. these plans are therefore called cryptogams meaning with hidden reproductive organs because their reproductive organs are inconspicuous 

 

  1. Thallophyta –  THALLOS –  undifferentiated; PHYTON –  plants
  2.  Bryophyta – BRYON – moss ; PHYTON –  plant
  3.  Pteridophyta – PTERIS –  fern; PHYTON –  plant



 PhaneroGAMAE 

 

 plants that make seeds and have well-differentiated reproductive tissues are called phanerogams

 on the basis of whether the seeds are naked or enclosed in fruits, these are divided into two groups

 

  1.  Gymnosperms  – gymnOS-  naked;SPERMA –  seed

  2.  Angiosperms – ANGION –  covered SPERMA- seed

    the characteristics of angiosperms are as follows
    1.  these are also called flowering plants the seeds develop inside an organ called over it becomes a fruit after developing
    2.  plant embryos in seas have structures called cotyledons and they are also called seed leaves because in many cases they emerge and become green when the seed germinates

      •  the angiosperms are divided into two groups on the basis of the numbers of cotyledons present in the seed
        • Dicotyledonous plants or  dicots 
        •  monocotyledonous plants for monocots

 

MCQ SHort Questions (1 Marks)

অতি সংক্ষিপ্ত প্রশ্নোত্তর - Short Answers & Questions (3-4 Marks)

ব্যাখ্যা ভিত্তিক সংক্ষিপ্ত প্রশ্নোত্তর - Long Answers & Questions (5-6 Marks)

update

 

অতিরিক্ত গুরুত্বপূর্ণ প্রশ্ন

  • all replace

CBSE Related Links

error: Content is protected !!
Scroll to Top