CBSE Class 12 Biology Boards 2020 Question Paper Solved Set D

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

Biology Class 12 Question Paper

SECTION – A
1. Which one of the following is not found in a female gametophyte of an angiosperm ?
 
(a) Germ pore
 
(b) Synergids
 
(c) Filiform apparatus
 
(d) Central cell
 
2. The autosomal disorder/disease in humans is
 
(a) Colour blindness
 
(b) Thalassemia
 
(c) Haemophilia
 
(d) Turner’s Syndrome
 
3. Choose the chromosome, in a human, that possesses least number of genes.
 
(a) 21st Chromosome
 
(b) Autosome
 
(c) X-Chromosome
 
(d) Y-Chromosome
 
4. The practice of mating unrelated animals within the same breed, but with no common ancestor on either side of the pedigree for 4-6 generation is known as
 
(a) out-breeding
 
(b) out-crossing
 
(c) cross-breeding
 
(d) in-breeding 
            OR
Bacteria present in rumen of a cattle digest cellulose to produce
 
(a) Polysaccharides
 
(b) Sucrose
 
(c) Ethanol
 
(d) Methane 
 
5. It is observed that, the species diversity decreases as we
 
(a) move away from equator to poles
 
(b) move towards equator from poles
 
(c) move along the equator
 
(d) move from deserts to rain-forests. 
                        OR
CNG is preferred as a fuel over diesel for public transport because
 
(i) it is cost effective.
 
(ii) it burns almost completely.
 
(iii) it can be recycled.
 
(iv) it burns only partially.
 
Choose the correct combination.
 
(a) (i) + (ii)
 
(b) (i) + (iii)
 
(c) (ii) + (iii)
 
(d) (iii) + (iv) 
 
SECTION – B
6. Mention the advantages of emasculation and bagging in artificial hybridization in plants bearing unsexual, and bisexual flowers.
 
7. Two children one with blood group ‘AB’ and other with blood group ‘O’ are born to parents, where the father has blood group ‘A’ and the mother has blood group ‘B’. Work out a cross to show how is it possible ? 
 
8. Name the types of acquired immune responses, and the special types of lymphocytes involved in providing them.
OR
Name two organisms belonging to two different kingdoms, that are commonly used as biofertilizers, and how ? 
 
9. Write the basis of naming the restriction endonuclease EcoR-I. 
 
10. What are transgenic animals ? How was the first transgenic cow found to be more useful than the normal cow, for humans ?
 
11. How do the following organisms pull through the adverse environmental conditions ?
 
(a) Fungi
 
(b) Zooplankton
 
(c) Bear
 
(d) Snails 
 
12. (a) How many primary producers do you think would be needed to support six tertiary consumers in a grassland ecosystem ?
 
     (b) Draw a grassland pyramid to substantiate your answer.
Please click on below link to download CBSE Class 12 Biology Boards 2020 Question Paper Solved Set D.

CBSE Class 12 Biology Boards 2020 Question Paper Solved Set D

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