BoardGuess.com

CBSE Ophthalmic Techniques Biology Theory Paper I (Vocational) Question Paper Class 12th (2010)

  Cbse » Cbse Question Papers » Class Xii » Year 2010 » You are here

Series OSS                                                                                                                               Code No. 137

                                                                OPHTHALMIC TECHNIQUES (Vocational)
                                                                          BIOLOGY (Theory) Paper I

Time allowed : 3 hours                                                                                                Maximum Marks : 30

Note:
(i) Attempt any ten questions.
(ii) All questions carry equal marks.

 

 

 

1. (a) List the parts of a compound microscope in sequence starting from the mirror up to your eyes, through which the light travels while you are examining a slide under it.


   (b) How does an electron microscope differ from a compound microscope in regard to

(i) the nature of objective lens, and
(ii) the source of illumination ?    3

 


2. (a) List the three major points of the cell theory.


    (b) Which one of the following does not match with the category of the organic compounds of the remaining three, and why ?
Lipase, Maltase, Pepsin, Insulin    3

 


3. Given below is a diagrammatic sketch of one of the stages of mitotic type of cell division.

                                                                          

(i) Is it a plant cell or an animal cell ? Give one reason in support of your answer.
(ii) Name the stage that preceded it and draw a diagram of how it may have looked like.    3

 


4. Taking the example of flower colour in garden pea, explain the terms allele, dominant and heterozygous.

 


5. (a) Explain the term ‘variation’ with respect to the following features in humans : Height, Ability to roll tongue and ABO blood groups.


    (b) Differentiate between continuous and discontinuous variations with respect to the same three features mentioned above in (a).    3

 


6. Write briefly about the following in humans as asked against each :    3

  (i) Autosomes - meaning and their total number,
(ii) Sex-linked characters - any two examples
(iii) Polygenic inheritance - definition and one example

 


7. Draw a labelled diagram of the general structure of a human sperm as observed through electron microscope.    3

 


8. Explain  briefly  the  term  alternation of generations  as  found in angiosperms.    3

 


9. Write about the following diseases as asked against each :    3

  (i) Typhoid : mode of transmission and any one main symptom
(ii) Rabies : category of pathogen and mode of transmission
(iii) Ringworm : category of pathogen and the body part affected

 


10. (i) Define disease.
     (ii) Mention  any one  difference between infectious diseases and non-infectious diseases.
    (iii) How do mosquitoes and houseflies differ in their mode of spreading diseases ?    3

 


11. (i) What is a forest ?
     (ii) List any four ways how forests are advantageous to us.    3

 


12.  Name the micro-organism which the bakers use in making bread, and briefly describe the steps and the process involved.





Start Discussion!
*
* (Will not be published)
* (First time user can put any password, and use same password onwards)
*
Start a new topic: (If you have any question related to this post/category then you can start a new topic and people can participate by answering your question in a separate thread)
Title/Question: (55 Chars. Maximum)
Comment/Detailed description:* (No HTML / URL Allowed)

Characters left

Verification code:*



(If you cannot see the verification code, then refresh here)




CBSE Board, UP Board, IGNOU, JNU, MBA MCA, BBA and other educational boards of India

Disclaimer: For documents and information available on BoardGuess.com, we do not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information. Papers, Results, Syllabus, Logo and other educational contents are owned by Indian Education Board and BoardGuess does not hold any copyright on it. The format of materials, being displayed on this website, comes under the copyright act. BoardGuess.com, All Rights Reserved ©