8th Class Biology Textbook PDF In English

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8th Class Biology Textbook Book PDF Free Download

Chapters Of The Book

  1. What is Science?
  2. Cell – The Basic Unit of Life
  3. The World of Microorganisms Part I&II
  4. Reproduction in Animals
  5. The Age of Adolescence
  6. Production of Food from Plants
  7. Production of Food from Animals
  8. Biodiversity and its Conservation
  9. Different Ecosystems
  10. Not for Breathing Not for Drinking
  11. Why do we fall ill?

Chapter 1: What is science?

Science is the concerted human effort to understand or to understand better, the history of the natural world and how the natural world works with observable physical evidence as to the basis of that understanding.

It is done through observation of natural phenomena, and/or through experimentation that tries to simulate natural processes under controlled conditions. Science is a process of thinking.

Science is an organized study of knowledge that is based on experimentation. Science is a tool for searching truths of nature. Science is the way of exploring the Questioning is the primary or fundamental step in scientific thinking.

There are many phenomena in nature around us which sprout up doubt in our minds Of course they may be problems. Let us observe the following experiences, you too can add your observations to enrich the list.

  1. Why do leaves fall down from the tree after turning yellow?
  2. How do ants identify sweets kept in a tin?
  3. Why can’t we see stars during the daytime?
  4. Pickles do not spoil, but sambar getsspoiled soon. Why?
  5. Farmers are afraid of unseasonal rains and uncontrolled pests. How to solve these problems?
  6. How are diseases caused and how to prevent and cure them?

Why science?

The individual perspective

(Why do people conduct experiments? what are they doing?) In most of the above cases, they’re collecting information to test new ideas or to disprove old ones.

(Scientists become famous for discovering new things that change how we think about nature, whether the discovery is a new species of dinosaur or a new way in which atoms bond.)

Many scientists find their greatest joy in a previously unknown fact (a discovery) that explains some problem previously not explained, or that overturns some previously accepted idea.

The Societal Perspective

If the above-said ideas explain individuals’ perspectives of science and its relation to society, one might wonder why societies and nations pay those individuals to experiment in science.

Why does a society devote some of its resources to this aspect of developing new knowledge about the natural world, or what has motivated these scientists to devote their lives to developing new knowledge?

Chapter 2: Cell

Our earth is a beautiful place where different types of organisms co-exist. From minute mosses to huge conifers, invisible bacteria to huge blue whales all have a basic unit called ‘Cell’.

Let us study about the cell. Before the first microscope was invented around 350 years ago, people were not aware of the living world that was not visible to the unaided eye.

Thereafter many scientists have been observing and describing the unknown world with the help of microscopes.

Language English
No. of Pages202
PDF Size15.80 MB
Source/ Creditsscert.telangana.gov.in

8th Class Biology Textbook PDF Free Download

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