Practice Paper Class: XII Subject: Biology

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2 PREFACE PREFACE The Practice Paper is a product of CBSE Class 12th Board exam experts of jagranjosh. com, an online educational portal of Dainik Jagran. After a round analysis for the previous four years of CBSE Class 12th Board Biology Question papers, the jagranjosh.com experts have set this Practice Paper for the 2014 CBSE Class 12th Boards. An analysis of Previous Years Biology Question Papers has been mentioned here: 2

3 Below are the Chapters covered under the entitled units: This conceptual Practice Paper along with guided solutions is a product exclusively for CBSE Class 12th students. The pattern of the Practice Paper is as per the Previous Year s CBSE Board Biology Question Papers, thus the students will find it easy and understandable in all its aspects. 3

4 Free Checklist for the Year 2015 for Class 12th Biology: Syllabus Chapter-wise Tips & Strategy Chapter-wise NCERT Solution Chapter-wise Online Test Sample Paper Solved Practice Paper Solved Guess Paper Guess Paper Stress Management Time Management Further Career Options Copyright Jagranjosh.com All rights reserved. No part or the whole of this ebook may be copied, reproduced, stored in retrieval system or transmitted and/ or cited anywhere in any form or by any means (electronic, mechanical, photocopying, recording or otherwise), without the written permission of the copyright owner. If any misconduct comes in knowledge or brought in notice, strict action will be taken. Disclaimer Readers are requested to verify/cross-check up to their satisfaction themselves about the advertisements, advertorials, and external contents. If any miss-happening, ill result, mass depletion or any similar incident occurs due to any information cited or referenced in this e-book, Editor, Director/s, employees of Jagranjosh.com can t be held liable/responsible in any matter whatsoever. No responsibilities lie as well in case of the advertisements, advertorials, and external contents. 4

5 Practice paper Class: XII Subject: Biology Time: 3 hrs Max Marks: 70 General Instructions 1. All the questions are compulsory. 2. The question paper consists of four sections A, B, C and D. Section A has 8 questions of 1 mark each. Section B has 10 questions of 2 marks each. Section C has 9 questions of 3 marks each, whereas Section D has 3 questions of 5 marks each. 3. 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 weight age. A student has to perform only one of the alternatives in such questions. 4. Wherever necessary, the diagrams drawn should be neat and properly labeled. "SECTION A" Q 1. Which technical term is used to describe morphologically and genetically similar individuals? Q 2. What is Hardy Weinberg s equation for genetic equilibrium? Q 3. During MOET technology in cow, which hormone is responsible for super ovulation? Q 4. Which technique is used to separate DNA fragments in a laboratory? 5

6 Q 5. Name the bacterium which produces crystal (Cry) protein. Q 6. In which situation will the doctor prescribe anti retroviral drug in patient? Q 7. How are standing crops and biomass related to each other? Q 8. Name the first transgenic cow, which produced protein enriched milk. "SECTION B" Q 9. Identify A, B, C and D in dinucleotide given below: Q 10. Give reason: (a) (b) Why brinjal is referred as chasmogamous while bean is cleistogamous? Why xenogamy ensures genetic variation? OR 6

7 State the function of the following in human reproductive system: (ii) Epididymis Leydig cells Q 11. Name the disorder which occurs due to: (ii) (iii) Absence of one X chromosome. Presence of extra X chromosome. Point mutation. (iv) Trisomy of chromosome 21. Q 12. State Darwin s theory of natural selection. Q 13. Name the drug which is obtained from poppy plant. How does it affect human body? State its mode of action. Q 14. What do you mean by eutrophication? Write any two consequences of this phenomenon. Q 15. What is polyblend? State any two points to support its significance. Q 16. Distinguish between: (a) (b) Ectotherms and Endotherms Hibernation and Aestivation Q 17. Name the technique adopted by Eli Lily company for the synthesis of insulin. How does it 7

8 differ from the insulin produced by human body? Q 18. Agrobacterium tumefaciens is pathogen of several dicot plants but still it is helpful in genetic engineering. Explain. "SECTION C" Q 19. What do you mean by ZIFT? How is it different from GIFT and IUT? Q 20. A person found in his blood test that he is HIV positive. (a) (b) (c) Name the disease cause by HIV in human. Name the test, which person has undergone. Which part of immune system does it affect and in what manner? Q 21. (ii) What is Apiculture? Give the scientific name of most common honey bee reared in India? Why honey collection improves during flowering periods? Q 22. Why HGP is called a mega project? State the goals of HGP. OR Give the diagrammatic representation of Miller s experiment. Q 23. What would be the phenotype and genotype of F 1 and F 2 generation, when a homozygous tall pea plant, with green seeds is crossed with dwarf pea plant, with yellow seeds? 8

9 Q 24. What is green house effect? State its contribution in ozone depletion. What are the harmful effects of ozone depletion? Q 25. A schematic representation of PCR is given below: Who discovered this technique? (ii) Name the process A, B and C. (iii) Identify D and E and state the importance of E in PCR. 9

10 Q 26. Account for the following: (a) (b) (c) What do you mean by biodiversity hot spots? Name any two hot spot regions in India. Write some features that make stable biological community. Q 27. Define the following: (ii) (iii) Apomixis Emasculation Geitonogamy "SECTION D" Q 28. (ii ) Draw a well labeled diagram of human seminiferous tubule. Mention different steps in sperm formation in seminiferous tubule. OR (ii) State the process of fertilization in angiosperms. Trace the development of embryo after syngamy in dicot plant. Q 29. (a) What is finger printing? (b Name the scientist who developed this technique. 10

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