NCERT Class 12 Biology Solutions: Chapter 11 – Biotechnology: Principles and Processes

Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).


Recombinant proteins Therapeutic use
DNAse Mucoviscidosis
Interleukin Cancer
Human growth hormone Dwarfism
Glucocerebrosidase Gaucher’s disease
Human insulin Diabetes
Tissue plasminogen activator Myocardial infarction
Insulin-like growth factor Childhood growth anabolic effects in adults
Erythropoietin Stimulation of production of erythrocytes
Interferon Treatment of infectious diseases like multiple sclerosis
Alpha-galactosidase A Enzyme replacement therapy


Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.

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NCERT Class 12 Biology Solutions: Chapter 9 – Strategies for Enhancement in Food Production

Explain in brief the role of animal husbandry in human welfare.

Solution: Animal husbandry deals with the scientific management of livestock. The aspects it includes are feeding, breeding and control diseases to raise the population of animal livestock. It usually includes animals such as cattle, pig, sheep, etc., which are useful for humans in various ways.

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NCERT Class 12 Biology Solutions: Chapter 8 – Human Health and Disease

What are the various public health measures, which you would suggest as safeguard against infectious diseases?

Solution: Public health measures are preventive measures which are taken to check the spread of various infectious diseases.

Some of these methods are

  • Maintenance of personal and public hygiene: This measure includes maintaining a clean body, consumption of healthy and nutritious food, drinking clean water, etc.
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NCERT Class 12 Biology Solutions: Chapter 6 – Molecular Basis of Inheritance

Group the following as nitrogenous bases and nucleosides

Adenine, Cytidine, Thymine, Guanosine, Uracil, and Cytosine.

Solution: Nitrogenous bases present in the list are adenine, thymine, uracil, and cytosine.  Nucleosides present in the list are cytidine and guanosine.

If a double-stranded DNA has 20 percent of cytosine, calculate the percent of adenine in the DNA.

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NCERT Class 12 Biology Solutions: Chapter 2 – Sexual Reproduction in Flowering Plants

Name the parts of an angiosperm flower in which development of male and female gametophyte take place.

Solution: The male gametophyte or the pollen grain develops inside the pollen chamber of the anther, whereas the female gametophyte develops inside the nucellus of the ovule from the functional megaspore.

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NCERT Class 12 Biology Solutions: Chapter 3 – Human Reproduction

Fill in the blanks:

(a) Humans reproduce __________. (asexually/sexually) 

(b) Humans are__________. (oviparous/viviparous/ovoviviparous) 

(c) Fertilization is __________ in humans. (external/internal) 

(d) Male and female gametes are __________. (diploid/haploid) 

(e) Zygote is __________. (diploid/haploid) 

(f) The process of release of the ovum from a mature follicle is called__________. 

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NCERT Class 12 Biology Solutions: Chapter 1- Reproduction in Organisms

NCERT is the first source from where all your preparation should start. We are always ready to help you out at every step of your preparation and to provide a complete solution. As part of our continuing endeavor, we are providing to you the complete solution to NCERT books in an easy to read and search format.

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NEET Previous Year Question Paper With Solution (2017): Biology Edition

Events Dates
 Availability of Application Form   1st – 30th November 2019 
 Last date to submit Application Form    30th November 2019
 Last date to pay the fees  November 2018
 Application form correction   December 2018
 Admit card availability  15th April 2019
 Exam Date  5th May 2019
 Answer Key  Within the week after the exam  
 Result date  5th June 2019
 Counseling date  2nd week of June 2019


Meet Khushboo K, an MSc.

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