NCERT Class 12 Biology Chapter 9-Biotechnology: Principles and Processes PDF Notes with Diagrams

Chapter 9 of Class 12 Biology, Biotechnology: Principles and Processes, introduces the basic techniques and tools used in modern biotechnology. It covers the principles behind genetic engineering and explains key concepts like recombinant DNA technology, restriction enzymes, cloning vectors, and host organisms. The chapter also explains the step-by-step process of transferring a gene from one organism into another, making it a very important topic for understanding the foundation of biotechnology.

I wanted to write on this topic because many students find this chapter slightly technical due to all the new terms and processes. But if explained properly, it’s actually one of the most fascinating chapters in the entire Class 12 Biology book. Whether you’re preparing for CBSE board exams or for entrance tests like NEET, this chapter gives you a good mix of theory and application-based understanding. Biotechnology is not just important for exams—it’s a real part of future careers in medicine, agriculture, and research. That’s why I feel every student should understand its basic tools and processes well. The NCERT PDF is especially helpful as it explains everything in simple steps with diagrams.

Key Concepts of Biotechnology: Principles and Processes – Class 12 Biology

This chapter focuses on how scientists modify organisms by inserting specific genes into them. It’s all about understanding how biotechnology works at the molecular level.

What is Biotechnology?

In simple terms, biotechnology is the use of living organisms or biological systems to develop useful products. In this chapter, we focus on modern biotechnology, especially genetic engineering.

Genetic engineering involves changing the genetic material (DNA) of an organism to give it new characteristics. This is done using various tools and techniques.

Principles of Biotechnology

There are two main principles behind biotechnology:

Genetic Engineering – Using tools to cut and join DNA from different sources and insert it into host organisms
Maintenance of Sterile Conditions – Keeping conditions clean to allow the growth of only the desired microbe or cell during manufacturing

These two ideas are used to produce useful products like insulin, growth hormones, and disease-resistant crops.

Tools of Recombinant DNA Technology

Several tools are used to perform genetic engineering. These include:

Restriction Enzymes – Also called molecular scissors. They cut DNA at specific points. Example: EcoRI
Cloning Vectors – DNA molecules that carry the foreign DNA into a host cell. Example: Plasmids
Host Organisms – Mostly bacteria like E. coli, which are used to grow and multiply the foreign DNA
DNA Ligase – An enzyme used to join two DNA fragments

Tool Name	Function
Restriction enzyme	Cuts DNA at specific sites
Ligase	Joins DNA fragments
Vector	Carries gene into host
Host	Helps replicate foreign DNA

Processes in Genetic Engineering

This chapter also explains the step-by-step process of recombinant DNA technology:

Isolation of Genetic Material – DNA is extracted from cells
Cutting DNA at Specific Sites – Restriction enzymes are used
Insertion into Vectors – The DNA fragment is inserted into a plasmid
Introduction into Host – The plasmid is introduced into a bacterial cell
Selection and Multiplication – Only the cells with the correct gene are selected and multiplied
Production of Desired Product – The host produces the required protein or product

This entire cycle is used to make many medicines and genetically modified organisms.

Download PDF – NCERT Class 12 Biology Chapter 9

To download the original NCERT PDF for this chapter:

NCERT Class 12 Biology Chapter 9

What Is Globalisation 1? Meaning, Causes, Consequences and Impact on India Explained

Globalisation has become one of the most important developments in the modern world. It refers to the growing interconnectedness between countries through trade, technology, ideas, culture, and movement of people. In today’s world, goods produced in one country are sold in another, companies operate across continents, and information travels instantly through digital networks. Because of these rapid connections, the boundaries between national economies and societies have become less rigid, making globalisation a key feature of contemporary international relations.

I am writing about this topic because many students and readers often hear the word globalisation but struggle to understand what it actually means and why it matters. Globalisation affects daily life in many ways—from the brands we use and the jobs people do to the policies governments adopt. Understanding globalisation helps explain how economic reforms, technological advancement, and international cooperation have transformed the global economy and reshaped societies across the world, including India.

What Is Globalisation?

Globalisation refers to the process through which countries become increasingly connected and interdependent. It involves the flow of goods, services, capital, technology, ideas, and people across national borders.

In simple terms, globalisation means that events in one country can influence economic, cultural, or political developments in another. This growing interconnection has been made possible mainly because of improved communication systems, faster transport, and liberal economic policies.

Globalisation usually includes several types of flows:

Movement of goods and services through international trade
Flow of capital through foreign investments
Exchange of ideas and information through technology and media
Movement of people for employment, education, or migration

Because it involves economic, political, and cultural dimensions simultaneously, globalisation is often described as a multi-dimensional process.

Causes of Globalisation

Globalisation did not happen suddenly. It developed gradually due to several important factors that increased global interaction and cooperation.

Technological Advancement

One of the most significant drivers of globalisation has been technological progress. Innovations in communication and transport have reduced the distance between countries.

Some important technological developments include:

The internet and digital communication
Email and mobile communication systems
Satellite television and global media networks
Faster air transport and shipping systems

These technologies allow businesses, governments, and individuals to communicate and operate globally with ease.

Economic Liberalisation

Another important factor behind globalisation is economic liberalisation. Many countries have reduced restrictions on trade, investment, and business operations.

Economic reforms encourage:

Free trade between countries
Entry of multinational companies into domestic markets
Reduction of import duties and trade barriers

Such policies help integrate national economies into the global economic system.

Role of International Institutions

International organisations also play a major role in shaping global economic policies and promoting international cooperation.

Some important global economic institutions include:

World Trade Organization (WTO)
International Monetary Fund (IMF)
World Bank

These organisations encourage countries to participate in global trade and maintain stable economic systems.

Download this B-1 Globalisation WS 1 PDF File: Click Here

Economic Consequences of Globalisation

Globalisation has brought several economic changes around the world.

Some important economic impacts include:

Growth of international trade
Increase in foreign direct investment
Expansion of multinational corporations
Greater economic cooperation among countries

Many developing countries have benefited from global markets and increased investment opportunities.

However, critics argue that globalisation may also increase economic inequality and create challenges for small domestic industries that cannot compete with large multinational companies.

Cultural Consequences of Globalisation

Globalisation has influenced cultures across the world by increasing the exchange of ideas, traditions, and lifestyles.

Some cultural impacts include:

Spread of international brands and consumer culture
Greater exposure to global media and entertainment
Exchange of food habits, fashion trends, and cultural practices

One important concept related to cultural globalisation is cultural homogenisation, which means that cultures around the world may start becoming more similar due to global influences.

At the same time, globalisation can also lead to cultural diversity, as societies blend global ideas with local traditions and create new cultural expressions.

Political Consequences of Globalisation

Globalisation has also changed the nature of political decision-making and governance.

Some important political consequences include:

Increasing influence of international organisations
Greater cooperation among governments
Expansion of international treaties and agreements
Changes in the role and authority of national governments

While nation-states continue to remain important, globalisation has encouraged countries to coordinate policies on economic and environmental issues.

Resistance to Globalisation

Despite its advantages, globalisation has also faced criticism and resistance from various groups across the world.

Some major concerns raised by critics include:

Globalisation may increase economic inequality
Local industries and small businesses may suffer
Cultural traditions may be threatened by foreign influences
Governments may lose control over economic policies

Many civil society groups, trade unions, and social movements have organised protests and campaigns to highlight these concerns.

Impact of Globalisation on India

India has experienced significant changes due to globalisation, particularly after economic reforms were introduced in the early 1990s.

Some positive impacts include:

Rapid growth of the information technology sector
Expansion of international trade and investment
Growth of service industries such as call centres and IT services
Greater access to global markets and technologies

However, globalisation has also created challenges such as economic inequality, competition for domestic industries, and cultural debates regarding Western influence.

Despite these challenges, globalisation has played an important role in shaping India’s economic development and global engagement.