Rajasthan Board Senior Secondary Examination 2013 – Biology Paper

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SECTION – A

1. Write the difference between chasmogamous and cleistogamous  flowers. 1

2. Define Ovulation. 1

3. Which disease is caused by point mutation ? 1

4. Write any two uses of pedigree study in human genetics. 1

5. Which scientist by experimentation demonstrated that “Life comes  only from pre-existing life” ? 1

6. Write the name of any one disease in crops caused by fungi. 1

7. What do you mean by fermentors ? 1

8. For biological control which fungus is used in the treatment of plant  diseases ? 1

9. Write the name of the technique, by which DNA fragments can be  separated. 1

10. Define Genetically Modified Organism. 1

11. How can infection caused by pathogens be detected ? 1

12. Why should lead free petrol or diesel be used in automobiles ? 1

13. Irrigation without proper drainage of water is harmful for the growth of  crops. Why ? 1

SECTION – B

14. If corpus luteum becomes inactive, what will be its effect on embryo  development ? Explain with reason. 2

15. A woman does not want any more pregnancy. Which permanent  method will she prefer and why ?  ½  + 1½  = 2

16. Write any four salient features of the Double helix structure of DNA.   4 × ½  = 2

17. The process of evolution of different species in a geographical area  starts from a point and literally radiates to other geographical areas.  Explain it with example. 2

18. In north India which technique is applied for high yield and desirable  qualities such as thick stem and high sugar content in sugarcane ?  Explain. 2

19. The nodules on the roots of leguminous plant are destroyed. How will it affect  the plant ? Explain with reason. 1 + 1 = 2

20. Which technique is used for the correction of diagnosed gene defects in  a child/embryo ? Explain with example. 2

21. How bacteria, fungi and lower plants survive in unfavourable  conditions ? Explain. 1 + 1 = 2

22. The egrets always forage close to where the cattle are grazing. What is  this interaction ? Explain.  ½  + 1½  = 2

23. “The accelerated rate of species extinction is due to human activities.”  Explain the statement with reasons. 2

24. Write any four differences between external fertilization and internal  fertilization. 4 × ½  = 2

OR 

Write any two differences between sexual and asexual reproduction.  “Vegetative reproduction is asexual reproduction.” — Explain. 1 + 1 = 2

SECTION – C

25. What is endosperm ? Describe free nuclear endosperm and cellular  endosperm. 1 + 1 + 1 = 3

26. What do you mean by co-dominance ? Explain it with example of blood  groups in human beings. 1 + 2 = 3

27. What is genetic engineering ? Explain the formation of recombinant  D.N.A technique. 1 + 2 = 3

OR

Write the steps in specific sequence of recombinant DNA technology.  Describe the method of isolation of the genetic material (DNA).   1 + 2 = 3

SECTION – D

28. What is nucleosome ? Explain the packaging of DNA helix. Draw the  labelled diagram of nucleosome. 1 + 2 + 1 = 4

OR

What is transcription ? Explain the process of transcription in bacteria  by labelled diagram. 1 + 2 + 1 = 4

29. What is decomposition ? Explain decomposition cycle in a terrestrial  ecosystem. Draw its diagrammatic representation. 1 + 2 + 1 = 4

OR

(i) What is nutrient cycle ?

(ii) Explain the carbon cycle on earth with the help of linear  diagram. 1 + 2 + 1 = 4

30. (i) What is immunity ?
(ii) Write the difference between active immunity and passive  immunity.
(iii) Explain passive immunisation.
(iv) Draw the labelled diagram of the stages of life cycle of  plasmodium in mosquito host. 1 + 1 + 1 + 1 = 4

OR

(i) Write the causes of cancer disease.
(ii) Explain cancer detection.
(iii) Give diagrammatic representation of lymph nodes. 1 + 2 + 1 = 4