TNPSC Exam MaanavaN Time Table October Month Day 3 09.Oct.2017
How does life evolved on earth? What is the major classification adopted by biologists to understand this? This tutorial is devised to enable students to review the basic biological concepts that they may need in preparing for Competitive Exams. The aim of this material on biology is to support students on introductory and essential topics in a pointwise and systematic manner.
The planet earth came into existence between 4 and 5 billion years ago. Life evolved on planet earth about 3.5 billion years ago. Since then approximately 15 million different species of organisms have evolved. But only about two million have been identified so for. In this lesson we will learn how life first originated on earth and how such a vast variety of organisms, popularly known as biodiversity, evolved through variation and natural selection. The study of such a wide variety becomes convenient only when organisms are grouped according to similarities and differences among them, named, and their evolutionary relationships established. We will learn about the importance and method of classification of organisms in this lesson too.
The kingdoms Monera which includes all the bacteria and the protoctista which includes the protoza, the diatoms and some algae are in a way the lowest among the living world. All bacteria, majority of Protoctists and many fungi are microscopic and generally referred to as microorganisms. You will learn about the three kingdoms in this lesson.
You have just learnt that cell is the fundamental structural and functional unit of organisms and that bodies of organisms are made of cells of various shapes and sizes. Groups of similar cells aggregate to collectively perform a particular function. Such groups of cells are termed “tissues”. This lesson deals with the various kinds of tissues of plants and animals.[wpsm_button color=”green” size=”big” link=”https://drive.google.com/file/d/0B9Fa6tAcZBhtT20xMG5LSlBYb3c/view?usp=sharing” icon=”none” class=”” target=”_blank”]Click Here To Download[/wpsm_button]
To Join Telegram Channel
அரசுத் தேர்வில் எளிமையாகக் கற்க மற்றும் 100% வெற்றி பெற வேண்டுமா ?
இதோ மாணவனின் TNPSC Course Pack....
இந்த Course Pack – ல் அடங்குபவை
மாணவனின் பாடக்குறிப்புக்களின் சிறப்புக்கூறுகள்:
- பாடம் வாரியான பாடக்குறிப்புகள் (Subject Wise Study Materials)
- வினா விடை (300 Online Test)
- தமிழ் இலக்கணம் வீடியோ (Tamil Ilakkanam Videos)
- கணிதம் வீடியோ (Maths Videos)
- நடப்பு நிகழ்வுகள் (Current Affairs)
- சமச்சீர்கல்வி பாட குறிப்புகள்
- பாடம் வாரியாக வீடியோ குறிப்புகள்
- 2000 பக்கமுடைய PDF பாடக்குறிப்புகள்
To Join Telegram Channel