9th class biology text book in English pdf download

9th class biology book-HI dear students here you download 9th biology textbook for free. You also get a 9th class biology book in English PDF.

9th class biology text book in English pdf download

Introduction

In the 9th class biology book, you read about human life. Here you also learn about animals and plants. This book is totally free and you download here easily. This book contains a total of 9 chapters.

This book downloaded from the Punjab textbook board and uploaded on Google Drive.
Images taken from 9th Biology textbook from different chapters images.

I change some lines due to google plagiarism policy so if you want to read this chapter fully then download 9th class biology book pdf for free link given below to post end.

9th biology book chapter details

1-Introduction To Biology

Biology is the scientific study of life. The word “biology” has been derived from two Greek words; ‘bios’ meaning ‘life’ and ‘logos’ meaning ‘thought or reasoning’. In the course of biology, Dear students we will study how a man thought about living things on this planet.

In this 9th class biology book in English pdf, you read all 24 different biology branches with some important details.
  • ZOOLOGY
  • BOTANY
  • MICROBIOLOGY
  • Morphology
  • Anatomy
  • Histology
  • Cell biology
  • Physiology
  • Genetics
  • Embryology
  • Taxonomy
  • Paleontology
  • Environmental biology
  • Socio-biology
  • Parasitology
  • Biotechnology
  • Immunology
  • Entomology
  • Pharmacology
  • Biophysics
  • Biochemistry 
  • Biomathematics / Biometry
  • Biogeography
  • Bioeconomics

2-Solving A Biological problem

When we use biological methods for solving different problems this process called Biological method. It explains the steps that a biologist does in order to solve a biological problem. This method has played a very important role in scientific research for almost 500 years.

From Galileo’s experiment (in the 1590s) to current research, the biological method has contributed to the advancements in medicine, ecology, technology, etc. These paragraphs were taken from the 9th class biology book.

The biological method also provides the quality of data for public use.
Man has been always a biologist. In order to live a man on earth, he had to become a biologist.
In history, Man was a hunter of animals and a gatherer of fruits, seeds, roots, etc.

The more he knew about animals and their habitat, the more successful hunter he was after this knowledge. The man knew about plants.

3-Biodiversity

At least 10 million kinds of organisms inhabit the Earth but men have only studied less than one-third of these and cataloged (put in the record) by biologists. Diversity among the Earth’s organisms is more different than the fundamental unity of life.

We see these are all organisms share many biological characteristics. Five principal groups of organisms are prokaryotic, protests, fungi, plants, and animals.

So if you are interested to read this chapter with complete details then download the 9th biology textbook for free.

In this chapter, we will study and focus on the differences among different groups of organisms. And We will also learn and see how are organisms classified and named.

4-Cells And Tissues 

Butterfly wing is a thin sheet of cells, and same the shiny layer of our eyes. The meat we eat daily is composed of cells and its cells soon become part of our cells.

Our fingernails, eyelashes, orange juice, the wood of our pencil - these are all produced by cells. In this 9th biology book chapter, we will learn about cells and take a close look at it. And also we learn about their internal structure.

We will also learn how specific cells group together to form tissues. The use of a microscope is known as microscopy. The first compound microscope was developed by Zachariah Jansen, in Holland in 1595.

5-Cell Cycle

The most basic and important characteristic of life is reproduction. This occurs at different levels of organization.

Parts of cell chromosomes produce new chromosomes, cells create new cells and individuals produce offspring like themselves.

we learn Rudolf Virchow in 1st chapter. Rudolf  Virchow proposed an important biological principle i.e. all cells come from cells.

This principle tells us that all continuation of life, including all aspects of reproduction, totally based on the reproduction of cells. We usually refer to cellular reproduction as cell division.

We explain this chapter short with different changes so if you are interested to read this chapter with complete details then download the 9th class biology book Punjab textbook board in English pdf.

6-Enzymes

Anabolism includes the biochemical reactions in which larger molecules are synthesized while catabolism includes the biochemical reactions in which larger molecules are broken down.

The energy is released in catabolism and it is utilized in anabolism. In this way, the biochemical reactions are actually transfers.

During metabolism, chemicals are transformed from one to another by enzymes. Enzymes are crucial to metabolism because they act as biocatalysts and speed up and regulate metabolic pathways.

Enzymes are proteins that catalyze (i.e. speed up) biochemical reactions and are not changed during the reaction. I hope you download the 9th class biology book pdf.

7-Bio-Energetic

Chapter 4 described the structure of cell and chapter 6 mentioned the role of enzymes in cellular functions. A living cell exhibits ceaseless chemical activities.

We studied that cells are like “open systems” i.e. substances are entering and leaving the cell all the time. Inside cells, substances are broken down and new substances are formed.

Energy drives all these processes in a cell. In living organisms, energy exists in two forms: kinetic energy is actively involved in doing work, and potential energy is stored for future use.

Potential energy is stored in chemical bonds and is released as kinetic energy when these bonds break. Download 9th class biology book for more details.
 

8-Nutrition

The process in which food is obtained or prepared, absorbed and converted into body substances for growth and energy, is called nutrition.

Nutrients are the elements and compounds that an organism obtains and uses for energy or for the synthesis of new materials. These lines are taken from the 9th class biology book in English pdf.

We know that autotrophic organisms obtain water, carbon dioxide, and minerals from their environment and prepare their food which is then used for growth and energy. On the other hand, heterotrophic organisms obtain their food from other organisms and use it for growth and energy

9-Transport

An interesting problem is raised here. Pepsin is a powerful protein-digesting enzyme. Why does not it digest the stomach walls, which are mostly proteins? We saw that pepsin is not released in its active form.

Rather it is secreted as inactive pepsinogen, which requires HCl for activation. The mucous of gastric juice form a thick coating over the inner walls of the stomach and neutralizes the HCl there. It makes pepsinogen difficult to be activated and to attack stomach walls.

In the stomach, food is further broken apart through a process of churning. The walls of the stomach contract and relax and these movements help in the thorough mixing of gastric juice and food. The churning action also produces heat which helps to melt the lipid content of food.

The starch in our bite of bread and the protein in mutton have been partially digested and the food has been converted to a soup-like mixture called chyme. After it, the pyloric sphincter allows a little mass of chyme to enter the duodenum.

These all paragraphs taken from 9th class biology book Punjab textbook board in English pdf chapters some paragraphs some lines changed so if you want to read these chapters in detail then download 9th class biology book for free.

Dear students if you like our website and want more books then visit our website regularly or Subscribe to our news later for free.

Thanks for visiting and downloading education content from Kutablab.



Name Biology
Pages 279
Language English Medium
Size 9 MB

Post a Comment

Give your feedback through comments.So i improve our website and fix bugs.Please do not enter spam comments and bad words.

–>