CBSE Class 12 Biology Sample Papers 2015 Set 08

Section - A

1. A tissue culture experiment has been performed with a plant tissue infected with TMV. Meristematic tissue produces healthy plant. Reason out the possibility of obtaining such result.

2. State a method of cellular defence 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 suited in this situation to form an embryo in the laboratory, without involving a donor?

4. Calculate the length of the DNA of bacteriophage lambda that has 48502 base pairs.

5. If two genes are located far apart from each other on a chromosome, how the frequency of recombination will get affected?

Section - B

6. The alarming population growth is leading to scarcity of basic requirements. Enumerate and justify any two population control measures to overcome this problem.

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

8. Demand for mushroom as food has led to its culturing on a large scale. Similarly, it is perceived that microbes too would become acceptable as food. Identify a microbe which can be cultured as a food source and give the applicability of its culture in the given context.

OR

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

9. a) Patients who have undergone myocardial infarction are given clot buster. Mention the clot buster administered and its microbial source.

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