KALVISOLAI NEET | +1 | CHAPTER 1 | THE LIVING WORLD | 1.2 NEED FOR CLASSIFICATION. | ENGLISH MEDIUM.

ப்ளஸ் 1 படிக்கும் மாணவர்களுக்கு இது பயனுள்ளதாக இருக்கும். இந்த யூ ட்யூப் தளத்தில் வரும் ஆடியோவை ப்ளே செய்து மீண்டும் மீண்டும் கேளுங்கள். ஆடியோவை கேட்கும் பொழுதே கீழே உள்ள பாடத்தை உற்று நோக்குங்கள். பிறகு கீழே உள்ள கேள்விகளின் சரியான விடையை தேர்ந்தெடுத்து பின் SUBMIT செய்யுங்கள். நீங்கள் எடுத்த மதிப்பெண் வரும் அந்த மதிப்பெண்ணை கீழே உள்ள கமெண்ட் பாக்ஸ் இல் பதிவு செய்யுங்கள். மதிப்பெண் குறைந்தால் மீண்டும் ஒருமுறை முயற்சி செய்யுங்கள்... வாழ்த்துக்கள் மாணவர்களே...அன்புடன் - K.K.D.

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1.2 Need for classification.

• We come across many places, where things are arranged in specific categories. 
• In super markets, the shelves can have rows and columns of groceries, cosmetics, toys, stationeries, snacks and utensils. 
• If it is not arranged in a well organized manner, customers and salesperson will waste a lot of time in finding an item. 
• In the same way, libraries also organize the books alphabetically, or genre wise into autobiographies, novels, kids stories, science fiction etc. 
• Likewise, it is nearly impossible to study all the living organisms. 
• Hence, it becomes necessary to devise some means and methods to make this possible, and this process is called classification. 

What is Classification ?

• Classification is a process, by which things are grouped in convenient categories, based on easily observable characters.
• The scientific term used for these categories is taxa (taxon - singular). 
• Taxa indicates categories at different levels, for example Kingdom Animalia, includes multicellular animals such as reptiles, mammals etc. 
• Based on their characteristics, all living organisms can be classified into different taxa. 

What is Taxonomy ?

• The science of classification is called taxonomy.

What are the basis of the taxonomical studies ?

• External and internal structures along with developmental processes, and ecological information of organisms are essential, as they form the basis of the taxonomical studies. 

What are the basic to taxonomy ? 

• Characterisation, Identification, Nomenclature and Classification are the scientific stages that are basic to taxonomy.

List out the basic need for classifications ?

The basic need for classifications :

1. To identify and differentiate closely related species.

2. To know the variation among the species.

3. To understand the evolution of the species.

4. To create a phylogenetic tree among the different groups .

5. To conveniently study living organisms.

SELF ASSESSMENT

1.

.....is a process, by which things are grouped in convenient categories, based on easily observable characters.

Classification

Bio Diversity

Nomenclature

None of these

2.

The science of classification is called

Classification

Bio Diversity

Nomenclature

taxonomy

3.

This is not scientific stages that are basic to taxonomy.

Characterisation

Identification

Nomenclature

Biodiversity

4.

The scientific term used for these categories is

Species

taxa

Domain

Class

5.

EdThis is not the basic need for classifications.it Question here

To know the variation among the species.

To understand the evolution of the species.

To understand the embryo of the species.

To conveniently study living organisms.

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