CBSE Class 12 Biology Question Paper 2015 Delhi Set 3 with Answers (Reval)

CBSE Class 12 Biology Question Paper 2015 Delhi Set 3 with Answers (Reval). Students can download the last year question papers using the link below. Free download of examination question papers with solutions.Last 10 year question papers should be practised to get better marks in examinations.  

SECTION – A 

1. Name the transcriptionally active region of chromatin in a nucleus. 

2. A geneticist interested in studying variations and patterns of inheritance in living beings prefers to choose organisms for experiments with shorter life cycle. Provide a reason. 

3. What is Biopiracy ? 

4. State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks) during industrialization period in England. 

5. Indiscrimate diagnostic practices using X-rays etc., should be avoided. Give one reason. 

SECTION – B 

6. Differentiate between ‘ZZ’ and ‘XY’ type of sex-determination mechanisms. 

7. An infertile couple is advised to adopt test-tube baby programme. Describe two principle procedures adopted for such technologies. 

8. Many fresh water animals can not survive in marine environment. Explain. 

OR 

How are productivity, gross productivity, net primary productivity and secondary productivity interrelated ? 

9. Enumerate four objectives for improving the nutritional quality of different crops for the health benefits of the human population by the process of “Biofortification”. 

10.Mention a product of human welfare obtained with the help of each one of the following microbes : 

(a) LAB 

(b) Saccharomyces cerevisiae 

(c) Propionibacterium sharmanii 

(d) Aspergillus niger

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