CBSE Sample Paper Biology Class XII 2010

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SamplePaper 2010Class XII

Subject Biology

Time Allowed: 3 Hrs Max.

Marks: 70

General Instructions:

All the questions are compulsory.

The Question paper consists of four section A, B, C and D.

Section A contains 8 questions of 1 mark each, section B is of

10 questions of 2 marks each, Section C has 9 questions of 3

marks each whereas Section D is of 3 questions of 5 marks

each.

There is no overall choice. However, an internal choice has

been provided in one question of 2 marks, one question of 3

marks and all the three questions of 5 marks weightage. A

student has to attempt only one of the alternatives in such

questions.

Wherever necessary, the diagrams drawn should be neat and

clean and properly labeled.

Section A

1. Give the reason why bottled fruit juices bought from the

market is clearer as compared to those made at home.

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2. What is Adaptive Radiation?

3. What does the following symbolize in human pedigreeanalysis?

4. Why do internodal portion of sugarcane do not propagate

when they become in contact with the soil?

5. Distinguish between fragmentation and leaching?

6. Why is the pyramid of biomass inverted in aquatic habitat?

7. What is auto-immunity?

8. What is acrosome?

Section B

9. Write shot note on:

i. Parasitism

ii. Competition

iii. Amensalism

iv. Mutualism

10. Give two advantages of Saheli. What is sterilisation?

11. What is BOD? What does it infer?





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12. What is Selectable Markers? Give one example.

13. Write a short note on Polyblend.

14. Why is the length of a food chain in an ecosystem

generally limited to 3-4 trophic levels? Explain with an

example.

OR

Explain Exponential and Logistic Growth Models.

15. Why Morgan worked on Drosophila melanogaster?

16. Explain ADA Deficiency.

17. Give different ways for the prevention and control of use

af drugs and alcohols among the youth.

18. Give two examples each for Mendelian and Chromosomal

Disorders.

Section C

19.What is a Mule? What is out crossing?

20. Give a schematic representation showing the life cycle of

Plasmodium. What is the effect of Haemozion in our body?

21.Explain the Experiment conducted by Alfred Hershey and

Martha Chase.

22. Explain DNA Fingerprinting.

23. What is incomplete dominance? Give the appropriate

cross. Provide with an example.





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24. Differentiate between:

i. Sexual and Asexual Reproduction.

ii. Epicotyl and Hypocotyl.

iii. Apomixis and Polyembryony.

25. Explain Carbon Cycle and Phosphorous Cycle.

26. What are the advantages of Genetically Modified

Organisms (GMO)?

27. Explain Biomagnification and Eutrophication.

Section D

28. Explain Origin and Evolution of Man.

OR

Explain the Transforming Principle.

29. How is sex of Humans determined? Give the laws of

Inheritance.

OR

Explain Lac Operon. What is known as Aminoacylation of tRNA?

30.Explain Menstrual Cycle in Human Females. What is Menarch

and Menopause?

OR

Give the Diagrammatic Sectional view of Ovary. Explain

Oogenisis.




CBSE Sample Paper Biology Class XII 2010

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