CBSE Class 9 Science Diversity in Living Organisms Notes

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Study Material for Class 9 Science Chapter 7 Diversity In Living Organisms

Class 9 Science students should refer to the following Pdf for Chapter 7 Diversity In Living Organisms in Class 9. These notes and test paper with questions and answers for Class 9 Science will be very useful for exams and help you to score good marks

Class 9 Science Chapter 7 Diversity In Living Organisms

CBSE Class 9 Science Diversity in Living Organisms Notes. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

CLASSIFICATION

Biodiversity: The variety of living beings found in geographical area is called biodiversity of that area. Amazon rainforests is the largest biodiversity hotspot in the world. Need for Classification: Classification is necessary for easier study of living beings. Without proper classification, it would be impossible to study millions of organisms which exist on this earth.

BASIS OF CLASSIFICATION

Ancient Greek thinker Aristotle classified living beings on the basis of their habitat. He classified them into two groups, i.e. those living in water and those living on land. But his classification was too simple to justify inclusion of a particular organism into a particular group.

Some examples of scientific bases of classification are as follows:

Organization of nucleus: Nucleus may or may not be organized in an organism. On this basis, organisms can be divided into two groups, viz. prokaryotes and eukaryotes.

(a) Prokaryotes:

When nucleus is not organized, i.e. nuclear materials are not membrane bound; the organism is called prokaryote.

(b) Eukaryotes:

When nucleus is organized, i.e. nuclear materials are membrane bound; the organism is called eukaryote.

Number of cells: An organism can be composed of a single cell or many cells. An organism with a single cell is called unicellular organism. On the other hand, an organism with more than one cell is called multicellular organism.

Mode of Nutrition

On this basis, organisms can be divided into two broad groups, i.e. autotrophs and heterotrophs. An autotroph makes its own food, while a heterotroph depends on other organisms for food.

Level of Organisation

Even in case of multicellular organisms, there can be different levels of organization. When a cell is responsible for all the life processes, it is called cellular level or organization. When some cells group together to perform specific function, it is called tissue level of organization. When tissues group together to form some organs, it is called organ level of organization. Similarly organ system level of organization is seen in complex organisms.

Classification and Evolution

It is a well established fact that all the life forms have evolved from a common ancestor. Scientists have proved that the life begun on the earth in the form of simple life forms. During the course of time, complex organism evolved from them. So, classification is also based on evolution. A simple organism is considered to be primitive while a complex organism is considered to be advanced.

CBSE Class 9 Science Diversity in Living Organisms Notes

CBSE Class 9 Science Diversity in Living Organisms Notes

CBSE Class 9 Science Diversity in Living Organisms Notes

CBSE Class 9 Science Diversity in Living Organisms Notes

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CBSE Class 9 Science Chapter 7 Diversity In Living Organisms Study Material

We hope students liked the above Study Material for Chapter 7 Diversity In Living Organisms designed as per the latest syllabus for Class 9 Science released by CBSE. Students of Class 9 should download the Study Material in Pdf format, read the notes and related questions and solutions given in above Class 9 Science Study Material on daily basis. All latest Study Material have been developed for Science by referring to the most important and regularly asked topics which the students should learn and practice to get better score in school tests and examinations. Expert teachers of studiestoday have referred to NCERT book for Class 9 Science to develop the Science Class 9 Study Material. After solving the questions given in the Study Material which have been developed as per latest course books also refer to the NCERT solutions for Class 9 Science designed by our teachers. Also download Class 9 Science Sample Papers given on studiestoday. After solving these you should also refer to Class 9 Science MCQ Test for the same chapter.

 

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