CBSE Biology Outside Delhi Past year paper (Set - 3) - 2014, Class 12 | Additional Study Material for NEET PDF Download

 Page 1


  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
CBSE Board 
Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 3) 
Time: 3 hour                  Total Marks: 70 
 
General Instructions: 
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 
weightage. 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 it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally?              [1] 
 
2. Name the stage of cell division where segregation of an independent pair of 
chromosomes occurs.                [1] 
 
3. Write an alternate source of protein for animal and human nutrition.          [1] 
 
4. Give an example of a plant which came into India as a contaminant and is a cause of 
pollen allergy.                 [1] 
 
5. Name the type of association that the genus Glomus exhibits with higher plants.   [1] 
 
6. State Gause’s Competitive Exclusion Principle.             [1] 
 
7. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology.             [1] 
 
8. State the role of C peptide in human insulin.             [1] 
 
 
 
 
 
Page 2


  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
CBSE Board 
Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 3) 
Time: 3 hour                  Total Marks: 70 
 
General Instructions: 
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 
weightage. 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 it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally?              [1] 
 
2. Name the stage of cell division where segregation of an independent pair of 
chromosomes occurs.                [1] 
 
3. Write an alternate source of protein for animal and human nutrition.          [1] 
 
4. Give an example of a plant which came into India as a contaminant and is a cause of 
pollen allergy.                 [1] 
 
5. Name the type of association that the genus Glomus exhibits with higher plants.   [1] 
 
6. State Gause’s Competitive Exclusion Principle.             [1] 
 
7. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology.             [1] 
 
8. State the role of C peptide in human insulin.             [1] 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – B 
 
9. 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.  
 
10.  List the symptoms of Ascariasis. How does a healthy person acquire this  
Infection?  [2] 
 
11.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area.                 [2] 
 
12. Construct an age pyramid which reflects an expanding growth status of human 
population.                  [2] 
 
13.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship.             [2] 
 
14.  How have transgenic animals proved to be beneficial in :           [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
15.  How does a restriction nuclease function? Explain.            [2] 
 
16.  Explain the two factors responsible for conferring stability to double helix structure 
of DNA.                  [2] 
 
17.  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? 
 
18.  Write the effect of the high concentration of L.H. on a mature Graafian follicle.       [2] 
 
 
 
 
 
 
Page 3


  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
CBSE Board 
Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 3) 
Time: 3 hour                  Total Marks: 70 
 
General Instructions: 
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 
weightage. 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 it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally?              [1] 
 
2. Name the stage of cell division where segregation of an independent pair of 
chromosomes occurs.                [1] 
 
3. Write an alternate source of protein for animal and human nutrition.          [1] 
 
4. Give an example of a plant which came into India as a contaminant and is a cause of 
pollen allergy.                 [1] 
 
5. Name the type of association that the genus Glomus exhibits with higher plants.   [1] 
 
6. State Gause’s Competitive Exclusion Principle.             [1] 
 
7. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology.             [1] 
 
8. State the role of C peptide in human insulin.             [1] 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – B 
 
9. 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.  
 
10.  List the symptoms of Ascariasis. How does a healthy person acquire this  
Infection?  [2] 
 
11.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area.                 [2] 
 
12. Construct an age pyramid which reflects an expanding growth status of human 
population.                  [2] 
 
13.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship.             [2] 
 
14.  How have transgenic animals proved to be beneficial in :           [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
15.  How does a restriction nuclease function? Explain.            [2] 
 
16.  Explain the two factors responsible for conferring stability to double helix structure 
of DNA.                  [2] 
 
17.  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? 
 
18.  Write the effect of the high concentration of L.H. on a mature Graafian follicle.       [2] 
 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – C 
 
19.  State the function of a reservoir in a nutrient cycle. Explain the simplified model of 
carbon cycle in nature.                [3] 
 
20.  Name and describe the technique that helps in separating the DNA fragments 
formed by the use of restriction endonuclease.             [3] 
 
21. The following graph shows the species – area relationship. Answer the following 
questions as directed.                [3] 
 
(a) Name the naturalist who studied the kind of relationship shown in the graph. 
Write the observations made by him.  
(b) Write the situations as discovered by the ecologists when the value of ‘Z’ (slope 
of the line) lies between  
(i) 0.1 and 0.2  
(ii) 0.6 and 1.2  
What does ‘Z’ stand for? 
(c) When would the slope of the line ‘b’ become steeper? 
 
22. 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 4


  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
CBSE Board 
Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 3) 
Time: 3 hour                  Total Marks: 70 
 
General Instructions: 
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 
weightage. 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 it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally?              [1] 
 
2. Name the stage of cell division where segregation of an independent pair of 
chromosomes occurs.                [1] 
 
3. Write an alternate source of protein for animal and human nutrition.          [1] 
 
4. Give an example of a plant which came into India as a contaminant and is a cause of 
pollen allergy.                 [1] 
 
5. Name the type of association that the genus Glomus exhibits with higher plants.   [1] 
 
6. State Gause’s Competitive Exclusion Principle.             [1] 
 
7. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology.             [1] 
 
8. State the role of C peptide in human insulin.             [1] 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – B 
 
9. 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.  
 
10.  List the symptoms of Ascariasis. How does a healthy person acquire this  
Infection?  [2] 
 
11.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area.                 [2] 
 
12. Construct an age pyramid which reflects an expanding growth status of human 
population.                  [2] 
 
13.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship.             [2] 
 
14.  How have transgenic animals proved to be beneficial in :           [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
15.  How does a restriction nuclease function? Explain.            [2] 
 
16.  Explain the two factors responsible for conferring stability to double helix structure 
of DNA.                  [2] 
 
17.  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? 
 
18.  Write the effect of the high concentration of L.H. on a mature Graafian follicle.       [2] 
 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – C 
 
19.  State the function of a reservoir in a nutrient cycle. Explain the simplified model of 
carbon cycle in nature.                [3] 
 
20.  Name and describe the technique that helps in separating the DNA fragments 
formed by the use of restriction endonuclease.             [3] 
 
21. The following graph shows the species – area relationship. Answer the following 
questions as directed.                [3] 
 
(a) Name the naturalist who studied the kind of relationship shown in the graph. 
Write the observations made by him.  
(b) Write the situations as discovered by the ecologists when the value of ‘Z’ (slope 
of the line) lies between  
(i) 0.1 and 0.2  
(ii) 0.6 and 1.2  
What does ‘Z’ stand for? 
(c) When would the slope of the line ‘b’ become steeper? 
 
22. 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 XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
23. 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 ’ 
 
24.                    [3] 
(a) Explain adaptive radiation with the help of a suitable example. 
(b) Cite an example where more than one adaptive radiations have occurred in an 
isolated geographical area. Name the type of evolution your example depicts   
and state why it is so named.                
 
25.                    [3] 
(a) Name any two copper releasing IUDs.               
(b) Explain how they act as effective contraceptives in human females. 
  
26.  Make a list of any three outbreeding devices that flowering plants have developed 
and explain how they help to encourage cross-pollination.           [3] 
OR 
Why angiosperm anthers are called dithecous? Describe the structure of its 
microsporangium. 
 
27.                    [3] 
(a) State how the constant internal environment is beneficial to organisms. 
(b) Explain any two alternatives by which organisms can overcome stressful 
external conditions.                 
 
 
 
 
 
 
 
 
 
 
Page 5


  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
CBSE Board 
Class XII Biology 
Board Paper 2014 – Outside Delhi (Set 3) 
Time: 3 hour                  Total Marks: 70 
 
General Instructions: 
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 
weightage. 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 it not possible for an alien DNA to become part of a chromosome anywhere 
along its length and replicate normally?              [1] 
 
2. Name the stage of cell division where segregation of an independent pair of 
chromosomes occurs.                [1] 
 
3. Write an alternate source of protein for animal and human nutrition.          [1] 
 
4. Give an example of a plant which came into India as a contaminant and is a cause of 
pollen allergy.                 [1] 
 
5. Name the type of association that the genus Glomus exhibits with higher plants.   [1] 
 
6. State Gause’s Competitive Exclusion Principle.             [1] 
 
7. Name the enzymes that are used for the isolation of DNA from bacterial and fungal 
cells for recombinant DNA technology.             [1] 
 
8. State the role of C peptide in human insulin.             [1] 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – B 
 
9. 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.  
 
10.  List the symptoms of Ascariasis. How does a healthy person acquire this  
Infection?  [2] 
 
11.  Explain the significant role of the genus Nucleopolyhedrovirus in an ecological 
sensitive area.                 [2] 
 
12. Construct an age pyramid which reflects an expanding growth status of human 
population.                  [2] 
 
13.  Describe the mutual relationship between fig tree and wasp and comment on the 
phenomenon that operates in their relationship.             [2] 
 
14.  How have transgenic animals proved to be beneficial in :           [2] 
(a) Production of biological products  
(b) Chemical safety testing 
 
15.  How does a restriction nuclease function? Explain.            [2] 
 
16.  Explain the two factors responsible for conferring stability to double helix structure 
of DNA.                  [2] 
 
17.  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? 
 
18.  Write the effect of the high concentration of L.H. on a mature Graafian follicle.       [2] 
 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – C 
 
19.  State the function of a reservoir in a nutrient cycle. Explain the simplified model of 
carbon cycle in nature.                [3] 
 
20.  Name and describe the technique that helps in separating the DNA fragments 
formed by the use of restriction endonuclease.             [3] 
 
21. The following graph shows the species – area relationship. Answer the following 
questions as directed.                [3] 
 
(a) Name the naturalist who studied the kind of relationship shown in the graph. 
Write the observations made by him.  
(b) Write the situations as discovered by the ecologists when the value of ‘Z’ (slope 
of the line) lies between  
(i) 0.1 and 0.2  
(ii) 0.6 and 1.2  
What does ‘Z’ stand for? 
(c) When would the slope of the line ‘b’ become steeper? 
 
22. 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 XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
23. 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 ’ 
 
24.                    [3] 
(a) Explain adaptive radiation with the help of a suitable example. 
(b) Cite an example where more than one adaptive radiations have occurred in an 
isolated geographical area. Name the type of evolution your example depicts   
and state why it is so named.                
 
25.                    [3] 
(a) Name any two copper releasing IUDs.               
(b) Explain how they act as effective contraceptives in human females. 
  
26.  Make a list of any three outbreeding devices that flowering plants have developed 
and explain how they help to encourage cross-pollination.           [3] 
OR 
Why angiosperm anthers are called dithecous? Describe the structure of its 
microsporangium. 
 
27.                    [3] 
(a) State how the constant internal environment is beneficial to organisms. 
(b) Explain any two alternatives by which organisms can overcome stressful 
external conditions.                 
 
 
 
 
 
 
 
 
 
 
  
 
CBSE XII |  Biology 
Board Paper 2014 – Outside Delhi – Set 3 
 
     
 
SECTION – D 
 
28.  Explain the process of sewage water treatment before it can be discharged into 
natural water bodies. Why is this treatment essential?            [5] 
OR 
Explain the process of replication of a retrovirus after it gains entry into the human 
body. 
 
29.                    [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. 
 
30.                    [5] 
(a) Describe the various steps of Griffith’s experiment that led to the conclusion of 
the ‘Transforming Principle’.                
(b) How did the chemical nature of the ‘Transforming Principle’ get established? 
OR 
        Describe how the lac operon operates, both in the presence and absence of an 
inducer in E.coli.