CBSE Class 12 Biology Question Paper 2013 (2)

 CBSE Class 12 Biology Question Paper 2013 (2). 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 type of cell division that takes place in the zygote of an organism exhibiting haplontic life cycle. 

2. Write the scientific name of the microbe used for fermenting malted cereals and fruit juices. 

3. Write the unit used for measuring ozone thickness. 

4. Name the event during cell division cycle that results in the gain or loss of chromosome. 

5. How can bacterial DNA be released from the bacterial cell for biotechnology experiments? 

6. Write the importance of cryopreservation in conservation of biodiversity. 

7. Mention the role of the codons AUG and UGA during protein synthesis. 

8. Normally one embryo develops in one seed but when an orange seed is squeezed many embryos of different shapes and sizes are seen. Mention how it has happened. 

SECTION-B 

9. How do histones acquire positive charge ? 

10. Why is CuT considered a good contraceptive device to space children ? 

11. Differentiate between albuminous and non-albuminous seeds, giving one example of each. 

12. Explain the process of RNA interference. 

13. List the key tools used in recombinant DNA technology. 

14. Name the two types of immune systems in a human body.Why are cell mediated and humoral immunities so called ?

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