CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C

Read and download CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C designed as per the latest question paper pattern and Class 12 examination guidelines issued by CBSE, NCERT and KVS. The past year Question Papers for Class 12 Biology have been provided with solutions which will help students to assess their performance and find out topics in Biology Class 12 which they need to improve to get better marks in Class 12 exams. After solving these last year papers also refer to solved Sample Papers for Class 12 Biology available on our website to build strong understanding of the subject

Biology Question Paper Class 12

Students can refer to the below Class 12 Biology Question Paper designed to help students understand the pattern of questions that will be asked in Class 12 exams. Please download CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C

Biology Class 12 Question Paper

SECTION A
Note : Choose the correct option from the choices given in each of the following questions :
 
1. Introduction of an alien DNA into a plant host cell is achieved by making them
 
(A) Competent with bivalent ions
 
(B) Using microinjections
 
(C) Using gene gun
 
(D) Using lysozymes and chitinase
 
2. One of the ex situ conservation methods for endangered species is
 
(A) Biosphere reserves
 
(B) National parks
 
(C) Cryopreservation
 
(D) Wildlife sanctuaries
OR
Ozone gas is continuously formed in the stratosphere by 
 
(A) Action of UV rays on nascent oxygen
 
(B) Reaction of oxygen with water vapour
 
(C) Action of UV rays on molecular oxygen
 
(D) Action of UV rays on water vapour
 
3. Intense lactation in mothers acts as a natural contraceptive due to the
 
(A) Suppression of gonadotropins
 
(B) Hypersecretion of gonadotropins
 
(C) Suppression of gametic transport
 
(D) Suppression of fertilization
 
4. The principle of vaccination is based on the property of
 
(A) Specificity
 
(B) Diversity
 
(C) Memory
 
(D) Discrimination between ‘self ’ and ‘non-self ’
OR
Opioids act as
 
(A) Depressants
 
(B) Pain killers
 
(C) Euphoria providers
 
(D) Stimulants
 
5. Nematode specific genes were introduced into the tobacco host plant by using the vector
 
(A) Plasmid
 
(B) Bacteriophage
 
(C) pBR 322
 
(D) Agrobacterium
 
SECTION B
 
6. Spirulina is a rich source of proteins. Mention the two ways by which large scale culturing of these microbes is possible.
 
7. How does EcoRI specifically act on DNA molecule ? Explain.
 
8. (a) Explain the cause responsible in a human to have sex chromosomes as ‘XXY’ instead of ‘XX’ or ‘XY’.
 
    (b) List any two ways such individuals are different from the normal being.
Please click on below link to download CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C.

CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C

We hope you liked the above provided CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C. To get an understanding of the type of questions which were asked in previous year exams, it is important for Class 12 students to refer to CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C that we have provided above. Students can download all the Question Papers for Class 12 Biology which were issued in the exams so that you can practise them and solve all types of questions which have been asked till now. By doing all CBSE Class 12 Biology Boards 2020 Question Paper Solved Set C PYP (previous year papers) you will understand the regular questions and MCQ questions for Class 12 Biology which are always asked and learn them so that you can get full marks in those questions. You can download CBSE Class 12 Biology Previous Year Question Papers and Class 12 Biology Sample Papers in PDF. You should attempt all the last year question paper for Class 12 and Class 12 Biology MCQ Test in examination conditions at home and then compare their answers with the solutions provided by our teachers.
 

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