CBSE Class 12 Biology Boards 2020 Question Paper Solved Set A

Read and download CBSE Class 12 Biology Boards 2020 Question Paper Solved Set A 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 A

Biology Class 12 Question Paper

SECTION A
1. Meselson and Stahl carried out centrifugation in CsCl2 density gradient to separate :
(A) DNA from RNA
(B) DNA from protein
(C) The normal DNA from 15N-DNA
(D) DNA from tRNA
 
2. Self-pollination is fully ensured if 1
(A) the flower is bisexual.
(B) the style is longer than the filament.
(C) the flower is cleistogamous.
(D) the time of pistil and anther maturity is different.
OR
Zoospores are the reproductive units to carry asexual reproduction in 
(A) Chlamydomonas
(B) Spirogyra
(C) Yeast
(D) Rhizopus
 
3. Micropropagation can be achieved by 
(A) Self-pollination
(B) Asexual reproduction
(C) Tissue culture
(D) Vegetative propagation
OR
The microbes commonly used in kitchens are 
(A) Lactobacillus and Yeast
(B) Penicillium and Yeast
(C) Microspora and E. coli
(D) Rhizopus and Lactobacillus
 
4. The main barrier that prevents the entry of micro-organisms into our body is
(A) Antibodies
(B) Macrophages
(C) Monocytes
(D) Skin
 
5. Nematode specific genes were introduced into the tobacco host plant using a vector
(A) pBR 322
(B) Plasmid
(C) Bacteriophage
(D) Agrobacterium
 
6. Given below is one of the strands of a DNA segment :
           TACGTACGTACGTACG
3' _________________________________5'
(a) Write its complementary strand.
(b) Write a possible RNA strand that can be transcribed from the above DNA molecule formed.
 
7. Wings of birds and wings of butterflies contribute to locomotion. Explain the type of evolution such organs are a result of.
 
8. It is often observed that the chances of a person suffering from measles in his or her lifetime are low if he or she has suffered from the disease in their early childhood. Justify the statement.
 
9. List the three hormones produced in women only during pregnancy.
What happens to the levels of estrogen and progesterone during pregnancy ?
 
10. A student on a field trip suddenly felt breathlessness and started to sneeze very badly. Name this response and explain what it is due to.
 
11. With the help of a suitable example, explain how cross-breeding is carried out in developing a new breed in animals.
 
12. Name the genus of baculovirus that acts as a biological control agent in spite of being a pathogen. Justify by giving three reasons that make it an excellent candidate for the job.
OR
‘‘Micro-organisms play an important role for the biological treatment of sewage.’’ Justify.
Please click on below link to download CBSE Class 12 Biology Boards 2020 Question Paper Solved Set A.

CBSE Class 12 Biology Boards 2020 Question Paper Solved Set A

We hope you liked the above provided CBSE Class 12 Biology Boards 2020 Question Paper Solved Set A. 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 A 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 A 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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