NCERT Class 12 Books Biology Chapter 12- Biotechnology and its Applications

Safalta Expert Published by: Noor Fatima Updated Fri, 01 Jul 2022 11:17 PM IST

Highlights

Here is the information about  NCERT Class 12 Books Biology Chapter 12. You can give a read to this blog and get PDFs of the subject. 
 

Students studying in CBSE Class 12 can access NCERT Class 12 Books Biology Chapter 12- Biotechnology and its Applications here. It is PDF format. You can download the PDF for and learn from the book anytime you want. Students who are studying in Class 12 and candidates who are preparing for competitive exams can download the PDF for NCERT Class 12 Books Biology Chapter 12- Biotechnology and its Applications to learn from the reading material.  

If you take NCERT Books as references for the examinations, you would appreciate your decision as most of the questions that appear in board exams are from these books.

Free Demo Classes

Register here for Free Demo Classes

Please fill the name
Please enter only 10 digit mobile number
Please select course
Please fill the email
Something went wrong!
Download App & Start Learning
You can keep the digital form of the book handy and learn from it without any time constraints.

You can access FREE E-BOOKS at Safalta to prepare yourself for your examinations and test your knowledge. These books are not just free of cost, but they are also packed with ample knowledge and information related to your studies.

FREE MOCK PAPERS are also available that can help you test your own yourself. These papers can help you prepare for your exams in a better way.

Here, you can learn the NCERT Class 12 Books Biology Chapter 12- Biotechnology and its Applications. Moreover, you can get the links for other Chapter 12s to download the links. 


BIOTECHNOLOGY AND ITS APPLICATIONS

Biotechnology, as you would have learnt from the previous chapter, essentially deals with industrial scale production of biopharmaceuticals and biologicals using genetically modified microbes, fungi, plants and animals. The applications of biotechnology include therapeutics, diagnostics, genetically modified crops for agriculture, processed food, bioremediation, waste treatment, and energy production. Three critical research areas of biotechnology are:

(i) Providing the best catalyst in the form of improved organism usually a microbe or pure enzyme.

(ii) Creating optimal conditions through engineering for a catalyst to act, and

(iii) Downstream processing technologies to purify the protein/organic compound.

Let us now learn how human beings have used biotechnology to improve the quality of human life, especially in the field of food production and health.


12.1 BIOTECHNOLOGICAL APPLICATIONS IN AGRICULTURE

Let us take a look at the three options that can be thought for increasing food production

(i) agro-chemical based agriculture;

(ii) organic agriculture;
(iii) genetically engineered crop-based agriculture

The Green Revolution succeeded in tripling the food supply but yet it was not enough to feed the growing human population. Increased yields have partly been due to the use of improved crop varieties, but mainly due to the use of better management practices and use of agrochemicals (fertilisers and pesticides). However, for farmers in the developing world, agrochemicals are often too expensive, and further increases in yield with existing varieties are not possible using conventional breeding. Is there any alternative path that our understanding of genetics can show so that farmers may obtain maximum yield from their fields? Is there a way to minimise the use of fertilisers and chemicals so that their harmful effects on the environment are reduced? Use of genetically modified crops is a possible solution.

Plants, bacteria, fungi and animals whose genes have been altered by manipulation are called Genetically Modified Organisms (GMO). GM plants have been useful in many ways. Genetic modification has:

(i) made crops more tolerant to abiotic stresses (cold, drought, salt, heat).

(ii) reduced reliance on chemical pesticides (pest-resistant crops).

(iii) helped to reduce post harvest losses.

(iv) increased efficiency of mineral usage by plants (this prevents early exhaustion of fertility of soil).

(v) enhanced nutritional value of food, e.g., golden rice, i.e., Vitamin ‘A’ enriched rice.

In addition to these uses, GM has been used to create tailor-made plants to supply alternative resources to industries, in the form of starches, fuels and pharmaceuticals.

Some of the applications of biotechnology in agriculture that you will study in detail are the production of pest resistant plants, which could decrease the amount of pesticide used. Bt toxin is produced by a bacterium called Bacillus thuringiensis (Bt for short). Bt toxin gene has been cloned from the bacteria and been expressed in plants to provide resistance to insects without the need for insecticides; in effect created a bio-pesticide. Examples are Bt cotton, Bt corn, rice, tomato, potato and soyabean etc.

Bt Cotton: Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein. Why does this toxin not kill the Bacillus? Actually, the Bt toxin protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals. The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.

Specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into the several crop plants such as cotton (Figure 12.1). The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect-group specific. The toxin is coded by a gene cryIAc named cry. There are a number of them, for example, the proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms, that of cryIAb controls corn borer.

Pest Resistant Plants: Several nematodes parasitise a wide variety of plants and animals including human beings. A nematode Meloidegyne incognitia infects the roots of tobacco plants and causes a great reduction in yield. A novel strategy was adopted to prevent this infestation which was based on the process of RNA interference (RNAi). RNAi takes place in all eukaryotic organisms as a method of cellular defense. This method involves silencing of a specific mRNA due to a complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing). The source of this complementary RNA could be from an infection by viruses having RNA genomes or mobile genetic elements (transposons) that replicate via an RNA intermediate.

Using Agrobacterium vectors, nematode-specific genes were introduced into the host plant (Figure 12.2). The introduction of DNA was such that it produced both sense and anti-sense RNA in the host cells. These two RNA’s being complementary to each other formed a double stranded (dsRNA) that initiated RNAi and thus, silenced the specific mRNA of the nematode. The consequence was that the parasite could not survive in a transgenic host expressing specific interfering RNA. The transgenic plant therefore got itself protected from the parasite (Figure 12.2).











NCERT Class 12 Books Biology Chapter 12- Biotechnology and its Applications- PDF Download

Chapter 12: Biotechnology and its Applications

अध्याय 12: जैव प्रौद्योगिकी एवं उसके उपयोग

Where can you download NCERT Class 12 Books Biology Chapter 12 PDF?

Candidates can download NCERT Class 12 Books Biology Chapter 12- Biotechnology and its Applications PDF for free on our page. Links are given below.

Chapter 12: Biotechnology and its Applications

अध्याय 12: जैव प्रौद्योगिकी एवं उसके उपयोग

“NCERT Books Class 12 Biology the best study material”. Why?

The book can also help in clarifying doubts. Other benefits of studying from the NCERT Books Class 12 Biology are-
  • NCERT Books Class 12 Biology gives profound knowledge to the students about the subjects and topics.
  • The textbook has pictures that make chapters interesting.
  • These books can help students in self-study.

Why should students study from NCERT Books Class 12 Biology for board exams?

Almost all the questions that appear in board exams are from NCERT Books Class 12 Science. Moreover, a team of professional teachers drafts these books, which become a reliable source of study for students.
 

Why are CBSE Books for Class 12 Biology so important?

The Chapter 12 in CBSE Books for Class 12 Biology are vital for board exams and higher classes. Students should read the Unit given in the CBSE books for Class 12 Science. These stories and practice questions can help gain excellent marks.

To get outstanding marks, we provide mock test papers that can help gear-up your preparations for exams. Additionally, you can also download e-books to get yourself prepared even in a better way.
                                                                                                                                                                                     
 

Free E Books