CBSE Class 12 Biology Sample Paper 2017 Set E

Section - A

1. A certain tissue, of a plant, infected with TMV was used to obtain a new plant using tissue culture technique. Identify the technique used and reason out the possibility of obtaining a new healthy plant. 

2. State a method of cellular defense which works in all eukaryotic organisms. 

3. In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 percent. Judge, which kind of ART is suitable in this situation to form an embryo in the laboratory, without involving a donor? 

4. PCR requires very high temperature conditions where most of the enzymes get denatured. How was this problem resolved in a PCR? 

5. If two genes are located far apart from each other on a chromosome, what will be its effect on the frequency of recombination? 

Section - B

6. The alarming population growth is leading to scarcity of basic requirements. Suggest with reason, any two population control measures other than contraception to address the situation.

7. Both Down’s syndrome and Turner’s syndrome are examples of chromosomal disorders. Cite the differences between the two, at the chromosomal level. 

8.To reduce the percentage of population suffering from hunger and malnutrition, microbes are grown on a large scale to act as food supplements. Mention any two microbes used as food supplement and suggest their role. 

OR

Success rate of artificial insemination in cattle is fairly low. Identify any other technique to improve the successful production of hybrids. State two advantages of this technique.

9. a) A patient who is suffering from myocardial infarction is given a clot buster as part of his treatment. Mention the clot buster administered and its microbial source.

b) A person recuperating from illness is advised to have curd regularly. Why? 

10. Assess the effects of loss of biodiversity in a region. Mention any four such effects. 

Please click the link below to download CBSE Class 12 Biology Sample Paper 2017 Set E