CBSE Biology Outside Delhi Past year paper (Set - 2) - 2014, Class 12 | Additional Study Material for NEET PDF Download

 Page 1


  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
CBSE Board 
 Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 2) 
Time: 3 hrs Total Marks: 70 
 
General Instruction: 
1. All questions are compulsory. 
2. This question paper consists of four Sections A, B C and D. Section A contains 8 
questions of one mark each, Section B is of 10 questions of two marks each, Section C is 
of 9 questions of three marks each, and Section D is of 3 questions of five 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 attempt only one of the alternatives in such questions. 
4. Wherever necessary, the diagrams drawn should be neat and properly labelled. 
 
SECTION A 
 
1. Why is Gambusia introduced into drains and ponds? [1] 
 
2. State Gause’s Competitive Exclusion Principle. [1] 
 
3. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology. [1] 
 
4. State the role of C peptide in human insulin. [1] 
 
5. Why is it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally? [1] 
 
6. Why is secondary immune response more intense than the primary immune 
response in humans? [1] 
 
7. Why are analogous structures a result of convergent evolution? [1] 
8. Name the vegetative propagules in the following :  [1] 
(a) Agave  
(b) Bryophyllum 
 
 
 
 
Page 2


  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
CBSE Board 
 Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 2) 
Time: 3 hrs Total Marks: 70 
 
General Instruction: 
1. All questions are compulsory. 
2. This question paper consists of four Sections A, B C and D. Section A contains 8 
questions of one mark each, Section B is of 10 questions of two marks each, Section C is 
of 9 questions of three marks each, and Section D is of 3 questions of five 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 attempt only one of the alternatives in such questions. 
4. Wherever necessary, the diagrams drawn should be neat and properly labelled. 
 
SECTION A 
 
1. Why is Gambusia introduced into drains and ponds? [1] 
 
2. State Gause’s Competitive Exclusion Principle. [1] 
 
3. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology. [1] 
 
4. State the role of C peptide in human insulin. [1] 
 
5. Why is it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally? [1] 
 
6. Why is secondary immune response more intense than the primary immune 
response in humans? [1] 
 
7. Why are analogous structures a result of convergent evolution? [1] 
8. Name the vegetative propagules in the following :  [1] 
(a) Agave  
(b) Bryophyllum 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
SECTION B 
9. List the symptoms of Ascariasis. How does a healthy person acquire this infection?[2] 
10.  Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-
flies for his experiments? State any three reasons.  [2] 
OR 
Linkage and crossing-over of genes are alternatives of each other. Justify with the  
help of an example.  
 
11.  State the difference between the structural genes in a Transcription Unit of 
Prokaryotes and Eukaryotes. [2] 
12.  In Snapdragon, a cross between true-breeding red flowered (RR) plants and true-
breeding white flowered (rr) plants showed a progeny of plants with all pink 
flowers.  [2] 
(a) The appearance of pink flowers is not known as blending. Why?  
(b) What is this phenomenon known as? 
 
13. Write the location and functions of the following in human testes :  [2] 
(a) Sertoli cells  
(b) Leydig cells 
 
14.  Construct an age pyramid which reflects an expanding growth status of human 
population. [2] 
 
15.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship. [2] 
16.  How have transgenic animals proved to be beneficial in :  [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
17.  How does a restriction nuclease function? Explain. [2] 
 
18.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area. [2] 
 
 
 
 
Page 3


  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
CBSE Board 
 Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 2) 
Time: 3 hrs Total Marks: 70 
 
General Instruction: 
1. All questions are compulsory. 
2. This question paper consists of four Sections A, B C and D. Section A contains 8 
questions of one mark each, Section B is of 10 questions of two marks each, Section C is 
of 9 questions of three marks each, and Section D is of 3 questions of five 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 attempt only one of the alternatives in such questions. 
4. Wherever necessary, the diagrams drawn should be neat and properly labelled. 
 
SECTION A 
 
1. Why is Gambusia introduced into drains and ponds? [1] 
 
2. State Gause’s Competitive Exclusion Principle. [1] 
 
3. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology. [1] 
 
4. State the role of C peptide in human insulin. [1] 
 
5. Why is it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally? [1] 
 
6. Why is secondary immune response more intense than the primary immune 
response in humans? [1] 
 
7. Why are analogous structures a result of convergent evolution? [1] 
8. Name the vegetative propagules in the following :  [1] 
(a) Agave  
(b) Bryophyllum 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
SECTION B 
9. List the symptoms of Ascariasis. How does a healthy person acquire this infection?[2] 
10.  Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-
flies for his experiments? State any three reasons.  [2] 
OR 
Linkage and crossing-over of genes are alternatives of each other. Justify with the  
help of an example.  
 
11.  State the difference between the structural genes in a Transcription Unit of 
Prokaryotes and Eukaryotes. [2] 
12.  In Snapdragon, a cross between true-breeding red flowered (RR) plants and true-
breeding white flowered (rr) plants showed a progeny of plants with all pink 
flowers.  [2] 
(a) The appearance of pink flowers is not known as blending. Why?  
(b) What is this phenomenon known as? 
 
13. Write the location and functions of the following in human testes :  [2] 
(a) Sertoli cells  
(b) Leydig cells 
 
14.  Construct an age pyramid which reflects an expanding growth status of human 
population. [2] 
 
15.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship. [2] 
16.  How have transgenic animals proved to be beneficial in :  [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
17.  How does a restriction nuclease function? Explain. [2] 
 
18.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area. [2] 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
SECTION C 
19.  Identify ‘a’, ‘b’, ‘c’, ‘d’, ‘e’ and ‘f’ in the table given below : [3] 
No. 
 
Syndrome 
 
Cause 
 
Characteristics  
of affected 
individuals 
Sex 
Male/Female/Both 
1. 
 
Down’s 
 
Trisomy of 
21 
 
‘a’ (i)  
     (ii)  
‘b’ 
 
2. ‘c’ 
 
XXY 
 
Overall 
masculine 
development  
 
‘d’ 
 
3. Turner’s 
 
45 with XO 
 
‘e’  (i)  
      (ii)  
‘f’ 
 
 
20. Why is pedigree analysis done in the study of human genetics? State the conclusions 
that can be drawn from it. [3] 
21.  A woman has certain queries as listed below, before starting with contraceptive 
pills. Answer them.  [3] 
(a) What do contraceptive pills contain and how do they act as contraceptives?  
(b) What schedule should be followed for taking these pills? 
 
22.  Make a list of any three out breeding devices that flowering plants have developed 
and explain how they help to encourage cross-pollination.  [3] 
OR 
Why are angiosperm anthers called dithecous? Describe the structure of its 
microsporangium. 
 
23.  Since the origin of life on Earth, there were five episodes of mass extinction of 
species.  [3] 
(i) How is the ‘Sixth Extinction’, presently in progress, different from the previous 
episodes?  
(ii) Who is mainly responsible for the ‘Sixth Extinction’?  
(iii) List any four points that can help to overcome this disaster. 
 
 
 
Page 4


  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
CBSE Board 
 Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 2) 
Time: 3 hrs Total Marks: 70 
 
General Instruction: 
1. All questions are compulsory. 
2. This question paper consists of four Sections A, B C and D. Section A contains 8 
questions of one mark each, Section B is of 10 questions of two marks each, Section C is 
of 9 questions of three marks each, and Section D is of 3 questions of five 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 attempt only one of the alternatives in such questions. 
4. Wherever necessary, the diagrams drawn should be neat and properly labelled. 
 
SECTION A 
 
1. Why is Gambusia introduced into drains and ponds? [1] 
 
2. State Gause’s Competitive Exclusion Principle. [1] 
 
3. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology. [1] 
 
4. State the role of C peptide in human insulin. [1] 
 
5. Why is it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally? [1] 
 
6. Why is secondary immune response more intense than the primary immune 
response in humans? [1] 
 
7. Why are analogous structures a result of convergent evolution? [1] 
8. Name the vegetative propagules in the following :  [1] 
(a) Agave  
(b) Bryophyllum 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
SECTION B 
9. List the symptoms of Ascariasis. How does a healthy person acquire this infection?[2] 
10.  Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-
flies for his experiments? State any three reasons.  [2] 
OR 
Linkage and crossing-over of genes are alternatives of each other. Justify with the  
help of an example.  
 
11.  State the difference between the structural genes in a Transcription Unit of 
Prokaryotes and Eukaryotes. [2] 
12.  In Snapdragon, a cross between true-breeding red flowered (RR) plants and true-
breeding white flowered (rr) plants showed a progeny of plants with all pink 
flowers.  [2] 
(a) The appearance of pink flowers is not known as blending. Why?  
(b) What is this phenomenon known as? 
 
13. Write the location and functions of the following in human testes :  [2] 
(a) Sertoli cells  
(b) Leydig cells 
 
14.  Construct an age pyramid which reflects an expanding growth status of human 
population. [2] 
 
15.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship. [2] 
16.  How have transgenic animals proved to be beneficial in :  [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
17.  How does a restriction nuclease function? Explain. [2] 
 
18.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area. [2] 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
SECTION C 
19.  Identify ‘a’, ‘b’, ‘c’, ‘d’, ‘e’ and ‘f’ in the table given below : [3] 
No. 
 
Syndrome 
 
Cause 
 
Characteristics  
of affected 
individuals 
Sex 
Male/Female/Both 
1. 
 
Down’s 
 
Trisomy of 
21 
 
‘a’ (i)  
     (ii)  
‘b’ 
 
2. ‘c’ 
 
XXY 
 
Overall 
masculine 
development  
 
‘d’ 
 
3. Turner’s 
 
45 with XO 
 
‘e’  (i)  
      (ii)  
‘f’ 
 
 
20. Why is pedigree analysis done in the study of human genetics? State the conclusions 
that can be drawn from it. [3] 
21.  A woman has certain queries as listed below, before starting with contraceptive 
pills. Answer them.  [3] 
(a) What do contraceptive pills contain and how do they act as contraceptives?  
(b) What schedule should be followed for taking these pills? 
 
22.  Make a list of any three out breeding devices that flowering plants have developed 
and explain how they help to encourage cross-pollination.  [3] 
OR 
Why are angiosperm anthers called dithecous? Describe the structure of its 
microsporangium. 
 
23.  Since the origin of life on Earth, there were five episodes of mass extinction of 
species.  [3] 
(i) How is the ‘Sixth Extinction’, presently in progress, different from the previous 
episodes?  
(ii) Who is mainly responsible for the ‘Sixth Extinction’?  
(iii) List any four points that can help to overcome this disaster. 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
24. Two types of aquatic organisms in a lake show specific growth patterns as shown 
below, in a brief period of time. The lake is adjacent to an agricultural land 
extensively supplied with fertilisers. [3] 
 
            Answer the questions based on the facts given above:  
(i) Name the organisms depicting the patterns A and B.  
(ii) State the reason for the growth pattern seen in A.  
(iii) Write the effects of the growth patterns seen above. 
 
25.  Name and describe the technique that helps in separating the DNA fragments 
formed by the use of restriction endonuclease.  [3] 
 
26.  Explain, giving three reasons, why tropics show greatest levels of species diversity.[3] 
27.  Community Service department of your school plans a visit to a slum area near the 
school with an objective to educate the slum dwellers with respect to health and 
hygiene.   [3] 
(a) Why is there a need to organise such visits?  
(b) Write the steps you will highlight, as a member of this department, in your 
interaction with them to enable them to lead a healthy life. 
 
 
 
 
 
 
 
Page 5


  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
CBSE Board 
 Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 2) 
Time: 3 hrs Total Marks: 70 
 
General Instruction: 
1. All questions are compulsory. 
2. This question paper consists of four Sections A, B C and D. Section A contains 8 
questions of one mark each, Section B is of 10 questions of two marks each, Section C is 
of 9 questions of three marks each, and Section D is of 3 questions of five 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 attempt only one of the alternatives in such questions. 
4. Wherever necessary, the diagrams drawn should be neat and properly labelled. 
 
SECTION A 
 
1. Why is Gambusia introduced into drains and ponds? [1] 
 
2. State Gause’s Competitive Exclusion Principle. [1] 
 
3. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology. [1] 
 
4. State the role of C peptide in human insulin. [1] 
 
5. Why is it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally? [1] 
 
6. Why is secondary immune response more intense than the primary immune 
response in humans? [1] 
 
7. Why are analogous structures a result of convergent evolution? [1] 
8. Name the vegetative propagules in the following :  [1] 
(a) Agave  
(b) Bryophyllum 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
SECTION B 
9. List the symptoms of Ascariasis. How does a healthy person acquire this infection?[2] 
10.  Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-
flies for his experiments? State any three reasons.  [2] 
OR 
Linkage and crossing-over of genes are alternatives of each other. Justify with the  
help of an example.  
 
11.  State the difference between the structural genes in a Transcription Unit of 
Prokaryotes and Eukaryotes. [2] 
12.  In Snapdragon, a cross between true-breeding red flowered (RR) plants and true-
breeding white flowered (rr) plants showed a progeny of plants with all pink 
flowers.  [2] 
(a) The appearance of pink flowers is not known as blending. Why?  
(b) What is this phenomenon known as? 
 
13. Write the location and functions of the following in human testes :  [2] 
(a) Sertoli cells  
(b) Leydig cells 
 
14.  Construct an age pyramid which reflects an expanding growth status of human 
population. [2] 
 
15.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship. [2] 
16.  How have transgenic animals proved to be beneficial in :  [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
17.  How does a restriction nuclease function? Explain. [2] 
 
18.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area. [2] 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
SECTION C 
19.  Identify ‘a’, ‘b’, ‘c’, ‘d’, ‘e’ and ‘f’ in the table given below : [3] 
No. 
 
Syndrome 
 
Cause 
 
Characteristics  
of affected 
individuals 
Sex 
Male/Female/Both 
1. 
 
Down’s 
 
Trisomy of 
21 
 
‘a’ (i)  
     (ii)  
‘b’ 
 
2. ‘c’ 
 
XXY 
 
Overall 
masculine 
development  
 
‘d’ 
 
3. Turner’s 
 
45 with XO 
 
‘e’  (i)  
      (ii)  
‘f’ 
 
 
20. Why is pedigree analysis done in the study of human genetics? State the conclusions 
that can be drawn from it. [3] 
21.  A woman has certain queries as listed below, before starting with contraceptive 
pills. Answer them.  [3] 
(a) What do contraceptive pills contain and how do they act as contraceptives?  
(b) What schedule should be followed for taking these pills? 
 
22.  Make a list of any three out breeding devices that flowering plants have developed 
and explain how they help to encourage cross-pollination.  [3] 
OR 
Why are angiosperm anthers called dithecous? Describe the structure of its 
microsporangium. 
 
23.  Since the origin of life on Earth, there were five episodes of mass extinction of 
species.  [3] 
(i) How is the ‘Sixth Extinction’, presently in progress, different from the previous 
episodes?  
(ii) Who is mainly responsible for the ‘Sixth Extinction’?  
(iii) List any four points that can help to overcome this disaster. 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
24. Two types of aquatic organisms in a lake show specific growth patterns as shown 
below, in a brief period of time. The lake is adjacent to an agricultural land 
extensively supplied with fertilisers. [3] 
 
            Answer the questions based on the facts given above:  
(i) Name the organisms depicting the patterns A and B.  
(ii) State the reason for the growth pattern seen in A.  
(iii) Write the effects of the growth patterns seen above. 
 
25.  Name and describe the technique that helps in separating the DNA fragments 
formed by the use of restriction endonuclease.  [3] 
 
26.  Explain, giving three reasons, why tropics show greatest levels of species diversity.[3] 
27.  Community Service department of your school plans a visit to a slum area near the 
school with an objective to educate the slum dwellers with respect to health and 
hygiene.   [3] 
(a) Why is there a need to organise such visits?  
(b) Write the steps you will highlight, as a member of this department, in your 
interaction with them to enable them to lead a healthy life. 
 
 
 
 
 
 
 
  
 
CBSE Board XII  |  Biology 
Board Paper 2014 – Outside Delhi – Set 2 
 
     
 
SECTION D 
28. Describe the Hershey and Chase experiment. Write the conclusion drawn by the 
scientists after their experiment.  
 [5] 
OR 
 
Work out a typical Mendelian dihybrid cross and state the law that he derived from 
it. 
 
29. With advancements in genetics, molecular biology and tissue culture, new traits 
have been incorporated into crop plants.  
Explain the main steps in breeding a new genetic variety of a crop.  [5] 
OR 
(a) State the objective of animal breeding.  
(b) List the importance and limitations of inbreeding. How can the limitations be 
overcome?  
(c) Give an example of a new breed each of cattle and poultry. 
 
30.   [5] 
(a) Where does fertilization occur in humans? Explain the events that occur during 
this process.  
(b) A couple where both husband and wife are producing functional gametes, but 
the wife is still unable to conceive, is seeking medical aid. Describe any one 
method that you can suggest to this couple to become happy parents.  
OR 
(a) Explain the different ways apomictic seeds can develop. Give an example of each.  
(b) Mention one advantage of apomictic seeds to farmers.  
(c) Draw a labelled mature stage of a dicotyledonous embryo.