Jagran Josh Logo
  1. Home
  2. |  
  3. CBSE Board|  

CBSE Class 12 Biology NCERT Exemplar Solutions: Chapter 8, Human Health and Diseases

Aug 30, 2018 12:35 IST
    Human Health and Diseases: NCERT Exemplar Solutions
    Human Health and Diseases: NCERT Exemplar Solutions

    In this article we are providing the detailed and accurate NCERT Exemplar Solutions for Class 12 Biology chapter 8, Human Health and Diseases. Each solution is explained in a way to help students easily understand concepts used in it.

    Experts at jagranjosh.com work hard to bring the most appropriate and authentic study material which would make studies a more interesting and engrossing task for students. Our subject experts work their best to deliver the flawless content.                                                                                                                       

    Students, who are having trouble finding the right and simple answers for the NCERT Exemplar Problems for chapter- Locomotion and Movement, should refer the answers given here. You will find here the most appropriate answers which include all the basic theories and terms of Biology. These solutions have been collated in the form of PDF which students can download for free of cost and refer the same when required.

    Few problems along with their solutions from this chapter are given follows:

    Q. The organisms which cause diseases in plants and animals are called

    (a) pathogens                  

    (b) vectors                       

    (c) insects                        

    (d) worms

    Ans. (a) pathogens          

    The organisms which cause diseases in plants and animals are called pathogens.

    Vectors are the carriers of pathogens.

    All the insects and worms do not cause diseases.

    Q. The genes causing cancer are

    (a) structural genes                             

    (b) expressor genes

    (c) oncogenes                                     

    (d) regulatory genes

    Ans. (c) oncogenes    

    Normal cells have genes called cellular oncogens or proto-oncogenes which are present in inactivated state, but under certain conditions (like mutation) these get transformed to cancer causing oncogens which are active.

    On the other hand, structural genes, expressor gene and regulatory genes are responsible for regulation of gene expression.

    Q. Why is mother's milk considered the most appropriate food for a new born infant?

    Ans. Mother’s milk during initial days after delivery is called colostrums. It contains several antibodies (especially IgA) which are absolutely essential for developing resistance for many diseases in the new-born babies.

    Q. What does the term 'memory' of the immune system mean?

    Ans. When the body encounters a pathogen for the first time, it mounts an immune response by generating antibodies. This response is of low intensity. Subsequent encounter with the same pathogen elicits a highly intensified secondary response.

    This is ascribed to the fact that our body appears to have memory of the first encounter. This type of secondary immune response is elicited by memory T-cells, B-cell which keeps ready to mount a rapid and vigorous attack as soon as the same pathagen infects the body again.

    Q. For an organ transplant, it is an advantage to have an identical twin. Why?

    Ans. For an organ transplant, it is an advantage to have an identical twin because the organ will have same surface markers and therefore, the recipient's immune system will not identify it as foreign and will not react against it. In case of different surface markers, the immune system starts a reaction, kills the foreign tissue or rejects it.

    Find below the links to download Class 12 Biology NCERT Exemplar Solutions for chapter 8 - Human Health and Diseases:

    Questions

    Link to Download PDF

    Multiple Choice Questions

    Download

    Very Short answer type questions

    Download

    Short answer type questions

    Download

    Long answer types questions

    Download

    CBSE Class 12 Biology Syllabus 2018 - 2019

    Class 12 Biology NCERT Exemplar Problems:

    Class 12 Biology NCERT Exemplar problems are a very good resource for preparing the critical questions like Higher Order Thinking Skill (HOTS) questions. Every year, many questions from the NCERT Exemplar are directly asked in the board exams as well as the medical entrance exams. So, it’s very important for students to practice the NCERT exemplar problems to prepare well for the boards and the competitive exams.

    Main topics discussed in Class 12 Biology, Chapter 8- Human Health and Diseases, are:

    • Common diseases in humans
    • Immunity
    • AIDS
    • Cancer
    • Drugs and alcohol abuse. 

    Download the complete NCERT Exemplar book from the following link:

    Class 12 Biology NCERT Exemplar Problems: Human Health and Diseases

    Note: Once you are done with all the NCERT Exemplar problems, refer the solutions given above in this article to check the correctness of your own solutions and know the right way to get the perfect answers.

    Class 12 Biology NCERT Solutions

    DISCLAIMER: JPL and its affiliates shall have no liability for any views, thoughts and comments expressed on this article.

    Latest Videos

    Register to get FREE updates

      All Fields Mandatory
    • (Ex:9123456789)
    • Please Select Your Interest
    • Please specify

    • ajax-loader
    • A verifcation code has been sent to
      your mobile number

      Please enter the verification code below

    Newsletter Signup
    Follow us on
    This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. By continuing to use our website, you agree to our Privacy Policy and Cookie Policy. OK
    X

    Register to view Complete PDF