NCERT Solutions Class 12 Biology Chapter 12 Biotechnology and its Applications

NCERT Solutions Class 12 Biology Chapter 12 Biotechnology and its Applications with answers available in Pdf for free download. The NCERT Solutions for Class 12 Biology with answers have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Standard 12 by CBSE, NCERT and KVS. Solutions to questions given in NCERT book for Class 12 Biology are an important part of exams for Grade 12 Biology and if practiced properly can help you to get higher marks. Refer to more Chapter-wise Solutions for NCERT Class 12 Biology and also download more latest study material for all subjects

Chapter 12 Biotechnology and its Applications Class 12 NCERT Solutions

Class 12 Biology students should refer to the following NCERT questions with answers for Chapter 12 Biotechnology and its Applications in standard 12. These NCERT Solutions with answers for Grade 12 Biology will come in exams and help you to score good marks

Chapter 12 Biotechnology and its Applications NCERT Solutions Class 12

Class 12 Biology

NCERT Solutions

Chapter 12 Biotechnology and its Applications

Question 1: Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because −

(a) bacteria are resistant to the toxin

(b) toxin is immature:

(c) toxin is inactive:

(d) bacteria encloses toxin in a special sac.

Answer toxin is inactive: In bacteria, the toxin is present in an inactive form, called prototoxin, which gets converted into active form when it enters the body of an insect.

Question 2: What are transgenic bacteria? Illustrate using any one example.

Answer Transgenic bacteria contain foreign gene that is intentionally introduced into its genome. They are manipulated to express the desirable gene for the production of various commercially important products. An example of transgenic bacteria is E.coli. In the plasmid of E.coli, the two DNA sequences corresponding to A and B chain of human insulin are inserted, so as to produce the respective human insulin chains. Hence, after the insertion of insulin gene into the bacterium, it becomes transgenic and starts producing chains of human insulin. Later on, these chains are extracted from E.coli and combined to form human insulin.

Class_12_Biology_Solutions_7

Question 3: Compare and contrast the advantages and disadvantages of production of genetically modified crops.

Answer The production of genetically modified (GM) or transgenic plants has several advantages.

(i) Most of the GM crops have been developed for pest resistance, which increases the crop productivity and therefore, reduces the reliance on chemical pesticides.

(ii) Many varieties of GM food crops have been developed, which have enhanced nutritional quality. For example, golden rice is a transgenic variety in rice, which is rich in vitamin A.

(iii) These plants prevent the loss of fertility of soil by increasing the efficiency of mineral usage.

(iv) They are highly tolerant to unfavourable abiotic conditions.

(v) The use of GM crops decreases the post harvesting loss of crops. However, there are certain controversies regarding the use of genetically modified crops around the world. The use of these crops can affect the native biodiversity in an area. For example, the use of Bt toxin to decrease the amount of pesticide is posing a threat for beneficial insect pollinators such as honey bee. If the gene expressed for Bt toxin gets expressed in the pollen, then the honey bee might be affected. As a result, the process of pollination by honey bees would be affected. Also, genetically modified crops are affecting human health. They supply allergens and certain antibiotic resistance markers in the body. Also, they can cause genetic pollution in the wild relatives of the crop plants. Hence, it is affecting our natural environment.

Question 4: What are Cry proteins? Name an organism that produces it. How has man exploited this protein to his benefit?

Answer Cry proteins are encoded by cry genes. These proteins are toxins, which are produced by Bacillus thuringiensis bacteria. This bacterium contains these proteins in their inactive from. When the inactive toxin protein is ingested by the insect, it gets activated by the alkaline pH of the gut. This results in the lysis of epithelial cell and eventually the death of the insect. Therefore, man has exploited this protein to develop certain transgenic crops with insect resistance such as Bt cotton, Bt corn, etc.

Please click the link below to download NCERT Solutions Class 12 Biology Chapter 12 Biotechnology and its Applications.

 

Tags: 

 


Click to View or Download pdf file
Click for more Biology Study Material
Chapter 1 Reproduction in Organisms
NCERT Solutions Class 12 Biology Chapter 1 Reproduction in Organisms
Chapter 2 Sexual Reproduction In Flowering Plants
NCERT Solutions Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants
Chapter 3 Human Reproduction
NCERT Solutions Class 12 Biology Chapter 3 Human Reproduction
Chapter 4 Reproductive Health
NCERT Solutions Class 12 Biology Chapter 4 Reproductive Health
Chapter 5 Principles of Inheritance and Variation
NCERT Solutions Class 12 Biology Chapter 5 Principles of Inheritance and Variation
Chapter 6 Molecular Basis of Inheritance
NCERT Solutions Class 12 Biology Chapter 6 Molecular Basis of Inheritance
Chapter 7 Evolution
NCERT Solutions Class 12 Biology Chapter 7 Evolution
Chapter 8 Human Health and Diseases
NCERT Solutions Class 12 Biology Chapter 8 Human Health and Disease
Chapter 9 Strategies for Enhancement In Food Production
NCERT Solutions Class 12 Biology Chapter 9 Strategies for Enhancement in Food Production
Chapter 10 Microbes In Human Welfare
NCERT Solutions Class 12 Biology Chapter 10 Microbes in Human Welfare
Chapter 11 Biotechnology Principles and Processes
NCERT Solutions Class 12 Biology Chapter 11 Biotechnology Principles And Processes
Chapter 12 Biotechnology and Its Application
NCERT Solutions Class 12 Biology Chapter 12 Biotechnology and its Applications
Chapter 13 Organisms and Populations
NCERT Solutions Class 12 Biology Chapter 13 Organisms and Populations
Chapter 14 Ecosystem
NCERT Solutions Class 12 Biology Chapter 14 Ecosystem
Chapter 15 Biodiversity and Conservation
NCERT Solutions Class 12 Biology Chapter 15 Biodiversity and Conservation
Chapter 16 Environmental Issues
NCERT Solutions Class 12 Biology Chapter 16 Environmental Issues

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

CBSE Board Examination Scheme of Assessment 2021 2022

A. Academic session to be divided into 2 Terms with approximately 50% syllabus in each term: The syllabus for the Academic session 2021-22 will be divided into 2 terms by following a systematic approach by looking into the interconnectivity of concepts and topics by...

Moderation of Marks Class 11 and 12 Board Exams

The portal for moderation and finalization of results for Class-12 is being opened from 16.07.2021 to 22.07.2021. As Board has to declare the result latest by 31.07.2021, schools have been requested to follow the schedule strictly and complete the moderation within...

Score well in Class 12 English Boards Exam

12th Board exams are an important part of students' lives. The marks obtained in the board exam decide the college in which one can study. In class 12 the syllabus of each and every subject increases vastly and it is difficult to cover up every point. In English also...

CBSE Class 10 Revised Syllabus

Last year CBSE had to reduce the syllabus because of the pandemic situation but it was not very effective because there were no examinations. This year to avoid any confusion and conflict, CBSE has decided to reduce the syllabus into term 1 and term 2. 50 percent of...

How To Solve Unseen Passages In English

Unseen passages may contain one or many paragraphs. This is one of the important yet easy parts for a student to get marks. Students should thoroughly study and understand the passage to answer the related questions. The unseen passages are there just to test the...

MCQ Question based CBSE examination

For 2021-22 CBSE has launched MCQ question-based examination for Term 1 & Term 2 board examinations. The entire syllabus has been divided into two parts each including 50% of the entire syllabus. To score well, students must practice as per the new CBSE term-wise...

×
Studies Today