CBSE Class 12 Biology Sample Paper 2013 Set 08 Solved

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Official CBSE Practice Papers for Class 12 Biology

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SECTION-A

1. When does an oocyte complete oogenesis? When does oogenesis begin in a human female?

2. Which organisms are usually the pioneer species in a (i) Hydrarch and (ii) Xerarch succession?

3. Give an example to show how the same species can occupy more than one trophic level in the same ecosystem.

4. Cucurbits and coconut bear unisexual flowers but are monoecious. Why?

5. Define allelomorphs.

6. DNA in chromosomes also replicates semi-conservatively. How did Taylor and colleagues prove it?

7. Besides converting the milk to curd, which are the two other roles played by LAB?

8. What are baculoviruses?

SECTION-B

9. (i) Very small animals like shrews and humming birds are rarely found in Polar Regions. Why?

   (ii) Define Diapause.

10. Read the graph given below and correlate the uterine events that take place according to the hormonal levels on

(i) 6-15 days
(ii) 16-25 days
(iii) 26-28 days (if ovum is not fertilized)

 CBSE Class 12 Biology Sample Papers 2013 (20) 1

11. Draw the structure of initiator t-RNA molecule. Why is t-RNA called as an adapter molecule?
 
OR
Lactose plays a dual role in the lac-operon. How? Why is lac-operon said to be under negative regulation?
 
12. (a) The graph below represents the growth patterns of two types of aquatic organisms over a brief period of time in a water body surrounded by an agricultural land extensively supplied with fertilisers.
Identify the organisms that would represent (i) A and (ii) B.
(b) State the reason for such a change in the water body and also write the term given toit.

CBSE Class 12 Biology Sample Papers 2013 (20) 2

13. How do Cu 7 or Multiload 375 and Progestasert or LNG-20 differ in their contraceptive action?
 
14. Inbreeding is necessary and useful in some cases. How? Name the problem which can be caused due to close inbreeding and the way to get rid of the problem.
 
15. a-Interferons are helpful in controlling a very fetal disease. Name the disease and ways to detect it. How do the a-interferons help in such cases?
 
16. How is a divalent cation like Calcium useful in making the host cell competent for transformation with rDNA? What is biolistics?
 
17. Approval of which organization is needed for getting a clearance for mass production of a genetically modified organism? What can be the any two possible reasons for the need of such organization?
 
18. IgE antibodies are usually produced in response to certain substances.What are such substances called? What is the condition caused due to such substance and mention the cell and its chemical which causes such condition?


Please refer to attached file for CBSE Class 12 Biology Sample Paper 2013 Solved Set H

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Exam Preparation Sample Paper for Class 12 Biology CBSE Class 12 Biology Sample Paper 2013 Set 08 Solved

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Explore downloadable sample sets for Class 12 Biology. Utilizing the CBSE Class 12 Biology Sample Paper 2013 Set 08 Solved allows learners to gauge exam readiness and master official CBSE assessment structures.

Key Advantages of Solving CBSE Class 12 Biology Sample Paper 2013 Set 08 Solved

  • Exam Blueprint: Understand mark allocations and structural guidelines relevant to Class 12 evaluations.
  • Targeted Improvement: Identify weak areas in Class 12 Biology requiring focused revision.
  • Pacing & Precision: Practice mixed question formats to build execution speed and ensure timely paper completion.

Post-Practice Strategy for Class 12 Biology

  1. Review Solutions: Evaluate your completed papers using expert-verified guidance inside our solution sets.
  2. Target Weaknesses: Class 12 students should analyze missed questions to rectify conceptual misunderstandings.
  3. Deep Revision: Re-read sections in the NCERT book for Class 12 Biology to clear doubts before solving items again.

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