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CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
CBSE 
Class XII Biology (Theory) 
Board Paper 2012 – Delhi (Set 1) 
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. Mention the unique flower phenomenon exhibited by Strobilanthus kunthiana 
(neelakuranaji). [1]  
                                                                                                                                              
2. How does smoking tobacco in human lead to oxygen deficiency in their body? [1] 
 
3. A garden pea plant produced inflated yellow pod and another plant of the same species 
produced constricted green pods. Identify the dominant traits. [1]  
 
4. Why is Eichhornia crassipes nicknamed as “Terror of Bengal”? [1]  
                                                   
5. Write the location and function of the sertoli cells in humans. [1] 
                                                    
6. Name the following: [1] 
(a) The semi-dwarf variety of wheat which is high-yielding and disease resistant.  
(b) Any one inter-specific hybrid mammal.    
                                                                                        
7. Write the similarity between the wing of a butterfly and the wing of a bat. What do you 
infer from the above with reference to evolution? [1]  
               
8. Write what do phytophagous insects feed on.  [1]   
Page 2


  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
CBSE 
Class XII Biology (Theory) 
Board Paper 2012 – Delhi (Set 1) 
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. Mention the unique flower phenomenon exhibited by Strobilanthus kunthiana 
(neelakuranaji). [1]  
                                                                                                                                              
2. How does smoking tobacco in human lead to oxygen deficiency in their body? [1] 
 
3. A garden pea plant produced inflated yellow pod and another plant of the same species 
produced constricted green pods. Identify the dominant traits. [1]  
 
4. Why is Eichhornia crassipes nicknamed as “Terror of Bengal”? [1]  
                                                   
5. Write the location and function of the sertoli cells in humans. [1] 
                                                    
6. Name the following: [1] 
(a) The semi-dwarf variety of wheat which is high-yielding and disease resistant.  
(b) Any one inter-specific hybrid mammal.    
                                                                                        
7. Write the similarity between the wing of a butterfly and the wing of a bat. What do you 
infer from the above with reference to evolution? [1]  
               
8. Write what do phytophagous insects feed on.  [1]   
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
SECTION B 
 
9. Draw a neat labeled sketch of a replicating fork of DNA.  [2] 
                                                              
10. Where is sporopollenin present in plants? State its significance with reference to its 
chemical nature.   [2]  
                                                                                                                                              
11.      [2] 
(a) Highlight the role of thymus as a lymphoid organ. 
(b) Name the cells that are released from the above mentioned gland. Mention how they 
help in immunity.      
                                                                                                                                        
12. Explain the work carried out by Cohen and Boyer that contributed immensely in 
biotechnology.   [2] 
                                                                                                                                                 
13. Why do clown fish and sea anemone pair up? What is this relationship called?   [2] 
                
14.    [2] 
(a) State the difference between meiocyte and gamete with respect to chromosome 
number. 
(b) Why is a whiptail lizard referred to as parthogenetic? 
  
15. Name the plant source of the drug popularly called “smack”. How does it affect the body 
of the abuser? [2]  
OR 
Why is Rhizobium categorized as a ‘symbiotic bacterium’? How does it act as a 
biofertiliser? 
 
16.     [2] 
(a) State the role of DNA ligase in biotechnology.  
(b) What happens when Meloidogyne incognita consumes cells with RNAi gene? 
 
17. Some organisms suspend their metabolic activities to survive in unfavorable       
conditions. Explain with the help of any four examples.   [2]  
                                                                                           
18.     [2] 
(a) Name the Protozoan parasite that causes amoebic dysentry in humans.                         
(b) Mention two diagnostic symptoms of the disease. 
(c) How is this disease transmitted to others?       
 
 
 
 
Page 3


  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
CBSE 
Class XII Biology (Theory) 
Board Paper 2012 – Delhi (Set 1) 
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. Mention the unique flower phenomenon exhibited by Strobilanthus kunthiana 
(neelakuranaji). [1]  
                                                                                                                                              
2. How does smoking tobacco in human lead to oxygen deficiency in their body? [1] 
 
3. A garden pea plant produced inflated yellow pod and another plant of the same species 
produced constricted green pods. Identify the dominant traits. [1]  
 
4. Why is Eichhornia crassipes nicknamed as “Terror of Bengal”? [1]  
                                                   
5. Write the location and function of the sertoli cells in humans. [1] 
                                                    
6. Name the following: [1] 
(a) The semi-dwarf variety of wheat which is high-yielding and disease resistant.  
(b) Any one inter-specific hybrid mammal.    
                                                                                        
7. Write the similarity between the wing of a butterfly and the wing of a bat. What do you 
infer from the above with reference to evolution? [1]  
               
8. Write what do phytophagous insects feed on.  [1]   
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
SECTION B 
 
9. Draw a neat labeled sketch of a replicating fork of DNA.  [2] 
                                                              
10. Where is sporopollenin present in plants? State its significance with reference to its 
chemical nature.   [2]  
                                                                                                                                              
11.      [2] 
(a) Highlight the role of thymus as a lymphoid organ. 
(b) Name the cells that are released from the above mentioned gland. Mention how they 
help in immunity.      
                                                                                                                                        
12. Explain the work carried out by Cohen and Boyer that contributed immensely in 
biotechnology.   [2] 
                                                                                                                                                 
13. Why do clown fish and sea anemone pair up? What is this relationship called?   [2] 
                
14.    [2] 
(a) State the difference between meiocyte and gamete with respect to chromosome 
number. 
(b) Why is a whiptail lizard referred to as parthogenetic? 
  
15. Name the plant source of the drug popularly called “smack”. How does it affect the body 
of the abuser? [2]  
OR 
Why is Rhizobium categorized as a ‘symbiotic bacterium’? How does it act as a 
biofertiliser? 
 
16.     [2] 
(a) State the role of DNA ligase in biotechnology.  
(b) What happens when Meloidogyne incognita consumes cells with RNAi gene? 
 
17. Some organisms suspend their metabolic activities to survive in unfavorable       
conditions. Explain with the help of any four examples.   [2]  
                                                                                           
18.     [2] 
(a) Name the Protozoan parasite that causes amoebic dysentry in humans.                         
(b) Mention two diagnostic symptoms of the disease. 
(c) How is this disease transmitted to others?       
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
 
SECTION C 
 
19. It is established that RNA is the first genetic material. Explain giving three reasons. [3] 
OR 
(a) Name the enzyme responsible for the transcription of tRNA and the amino acid the 
initiator tRNA gets linked with. 
(b) Explain the role of initiator tRNA in initiation of protein synthesis. 
 
20. State the theory of Biogenesis. How does Miller’s experiment support this theory?  [3] 
 
21. Name the two different categories of microbes naturally occurring in sewage water. 
Explain their role in cleaning sewage water into usable water.  [3]  
                                                      
22. Write the function of each one of the following:  [3]                                                                            
(a) (Oviducal) Fimbriae 
(b) Coleoptile 
(c) Oxytocin 
 
23. Name the genes responsible for making Bt cotton plants resistant to bollworm attack. 
How do such plants attain resistance against bollworm attacks? Explain.  [3] 
                                   
24. Study a part of the life cycle of malarial parasite given below.  
Answer the questions that follow: [3]                                                                                                                                                                  
 
(a) Mention the roles of ‘A’ in the life cycle of the malarial parasite. 
(b) Name the event ‘C’ and the organ where this event occurs. 
(c) Identify the organ ‘B’ and name the cells being released from it. 
  
Page 4


  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
CBSE 
Class XII Biology (Theory) 
Board Paper 2012 – Delhi (Set 1) 
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. Mention the unique flower phenomenon exhibited by Strobilanthus kunthiana 
(neelakuranaji). [1]  
                                                                                                                                              
2. How does smoking tobacco in human lead to oxygen deficiency in their body? [1] 
 
3. A garden pea plant produced inflated yellow pod and another plant of the same species 
produced constricted green pods. Identify the dominant traits. [1]  
 
4. Why is Eichhornia crassipes nicknamed as “Terror of Bengal”? [1]  
                                                   
5. Write the location and function of the sertoli cells in humans. [1] 
                                                    
6. Name the following: [1] 
(a) The semi-dwarf variety of wheat which is high-yielding and disease resistant.  
(b) Any one inter-specific hybrid mammal.    
                                                                                        
7. Write the similarity between the wing of a butterfly and the wing of a bat. What do you 
infer from the above with reference to evolution? [1]  
               
8. Write what do phytophagous insects feed on.  [1]   
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
SECTION B 
 
9. Draw a neat labeled sketch of a replicating fork of DNA.  [2] 
                                                              
10. Where is sporopollenin present in plants? State its significance with reference to its 
chemical nature.   [2]  
                                                                                                                                              
11.      [2] 
(a) Highlight the role of thymus as a lymphoid organ. 
(b) Name the cells that are released from the above mentioned gland. Mention how they 
help in immunity.      
                                                                                                                                        
12. Explain the work carried out by Cohen and Boyer that contributed immensely in 
biotechnology.   [2] 
                                                                                                                                                 
13. Why do clown fish and sea anemone pair up? What is this relationship called?   [2] 
                
14.    [2] 
(a) State the difference between meiocyte and gamete with respect to chromosome 
number. 
(b) Why is a whiptail lizard referred to as parthogenetic? 
  
15. Name the plant source of the drug popularly called “smack”. How does it affect the body 
of the abuser? [2]  
OR 
Why is Rhizobium categorized as a ‘symbiotic bacterium’? How does it act as a 
biofertiliser? 
 
16.     [2] 
(a) State the role of DNA ligase in biotechnology.  
(b) What happens when Meloidogyne incognita consumes cells with RNAi gene? 
 
17. Some organisms suspend their metabolic activities to survive in unfavorable       
conditions. Explain with the help of any four examples.   [2]  
                                                                                           
18.     [2] 
(a) Name the Protozoan parasite that causes amoebic dysentry in humans.                         
(b) Mention two diagnostic symptoms of the disease. 
(c) How is this disease transmitted to others?       
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
 
SECTION C 
 
19. It is established that RNA is the first genetic material. Explain giving three reasons. [3] 
OR 
(a) Name the enzyme responsible for the transcription of tRNA and the amino acid the 
initiator tRNA gets linked with. 
(b) Explain the role of initiator tRNA in initiation of protein synthesis. 
 
20. State the theory of Biogenesis. How does Miller’s experiment support this theory?  [3] 
 
21. Name the two different categories of microbes naturally occurring in sewage water. 
Explain their role in cleaning sewage water into usable water.  [3]  
                                                      
22. Write the function of each one of the following:  [3]                                                                            
(a) (Oviducal) Fimbriae 
(b) Coleoptile 
(c) Oxytocin 
 
23. Name the genes responsible for making Bt cotton plants resistant to bollworm attack. 
How do such plants attain resistance against bollworm attacks? Explain.  [3] 
                                   
24. Study a part of the life cycle of malarial parasite given below.  
Answer the questions that follow: [3]                                                                                                                                                                  
 
(a) Mention the roles of ‘A’ in the life cycle of the malarial parasite. 
(b) Name the event ‘C’ and the organ where this event occurs. 
(c) Identify the organ ‘B’ and name the cells being released from it. 
  
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
 
25. Given below is the representation of amino acid composition of the relevant         
translated portion of ß- chain of haemoglobin, related to the shape of human red blood 
cells.  [3] 
 
 
  
(a) Is this representation indicating a normal human or a sufferer from a certain related 
genetic disease? Give reason in support of your answer.  
(b) What difference would be noticed in the phenotype of the normal and the sufferer 
related to this gene? 
(c) Who are likely to suffer more from the defect related to the gene represented- the 
males, the females or both males and females equally? And why? 
 
26. By the end of 2002, the public transport of Delhi switched over to a new fuel. Name the 
fuel. Why is this fuel considered better? Explain. [3]  
                                                                                
27. Draw a schematic sketch of pBR 322 plasmid and label the following in it:  [3]                        
(a) Any two restriction sites 
(b) Ori and rop genes 
(c) An antibiotic resistant gene 
  
Page 5


  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
CBSE 
Class XII Biology (Theory) 
Board Paper 2012 – Delhi (Set 1) 
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. Mention the unique flower phenomenon exhibited by Strobilanthus kunthiana 
(neelakuranaji). [1]  
                                                                                                                                              
2. How does smoking tobacco in human lead to oxygen deficiency in their body? [1] 
 
3. A garden pea plant produced inflated yellow pod and another plant of the same species 
produced constricted green pods. Identify the dominant traits. [1]  
 
4. Why is Eichhornia crassipes nicknamed as “Terror of Bengal”? [1]  
                                                   
5. Write the location and function of the sertoli cells in humans. [1] 
                                                    
6. Name the following: [1] 
(a) The semi-dwarf variety of wheat which is high-yielding and disease resistant.  
(b) Any one inter-specific hybrid mammal.    
                                                                                        
7. Write the similarity between the wing of a butterfly and the wing of a bat. What do you 
infer from the above with reference to evolution? [1]  
               
8. Write what do phytophagous insects feed on.  [1]   
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
SECTION B 
 
9. Draw a neat labeled sketch of a replicating fork of DNA.  [2] 
                                                              
10. Where is sporopollenin present in plants? State its significance with reference to its 
chemical nature.   [2]  
                                                                                                                                              
11.      [2] 
(a) Highlight the role of thymus as a lymphoid organ. 
(b) Name the cells that are released from the above mentioned gland. Mention how they 
help in immunity.      
                                                                                                                                        
12. Explain the work carried out by Cohen and Boyer that contributed immensely in 
biotechnology.   [2] 
                                                                                                                                                 
13. Why do clown fish and sea anemone pair up? What is this relationship called?   [2] 
                
14.    [2] 
(a) State the difference between meiocyte and gamete with respect to chromosome 
number. 
(b) Why is a whiptail lizard referred to as parthogenetic? 
  
15. Name the plant source of the drug popularly called “smack”. How does it affect the body 
of the abuser? [2]  
OR 
Why is Rhizobium categorized as a ‘symbiotic bacterium’? How does it act as a 
biofertiliser? 
 
16.     [2] 
(a) State the role of DNA ligase in biotechnology.  
(b) What happens when Meloidogyne incognita consumes cells with RNAi gene? 
 
17. Some organisms suspend their metabolic activities to survive in unfavorable       
conditions. Explain with the help of any four examples.   [2]  
                                                                                           
18.     [2] 
(a) Name the Protozoan parasite that causes amoebic dysentry in humans.                         
(b) Mention two diagnostic symptoms of the disease. 
(c) How is this disease transmitted to others?       
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
 
SECTION C 
 
19. It is established that RNA is the first genetic material. Explain giving three reasons. [3] 
OR 
(a) Name the enzyme responsible for the transcription of tRNA and the amino acid the 
initiator tRNA gets linked with. 
(b) Explain the role of initiator tRNA in initiation of protein synthesis. 
 
20. State the theory of Biogenesis. How does Miller’s experiment support this theory?  [3] 
 
21. Name the two different categories of microbes naturally occurring in sewage water. 
Explain their role in cleaning sewage water into usable water.  [3]  
                                                      
22. Write the function of each one of the following:  [3]                                                                            
(a) (Oviducal) Fimbriae 
(b) Coleoptile 
(c) Oxytocin 
 
23. Name the genes responsible for making Bt cotton plants resistant to bollworm attack. 
How do such plants attain resistance against bollworm attacks? Explain.  [3] 
                                   
24. Study a part of the life cycle of malarial parasite given below.  
Answer the questions that follow: [3]                                                                                                                                                                  
 
(a) Mention the roles of ‘A’ in the life cycle of the malarial parasite. 
(b) Name the event ‘C’ and the organ where this event occurs. 
(c) Identify the organ ‘B’ and name the cells being released from it. 
  
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
 
25. Given below is the representation of amino acid composition of the relevant         
translated portion of ß- chain of haemoglobin, related to the shape of human red blood 
cells.  [3] 
 
 
  
(a) Is this representation indicating a normal human or a sufferer from a certain related 
genetic disease? Give reason in support of your answer.  
(b) What difference would be noticed in the phenotype of the normal and the sufferer 
related to this gene? 
(c) Who are likely to suffer more from the defect related to the gene represented- the 
males, the females or both males and females equally? And why? 
 
26. By the end of 2002, the public transport of Delhi switched over to a new fuel. Name the 
fuel. Why is this fuel considered better? Explain. [3]  
                                                                                
27. Draw a schematic sketch of pBR 322 plasmid and label the following in it:  [3]                        
(a) Any two restriction sites 
(b) Ori and rop genes 
(c) An antibiotic resistant gene 
  
  
 
CBSE XII  |  Biology 
Board Paper 2012 – Delhi – Set 1 
 
     
SECTION D 
28. Explain the carbon cycle with the help of a simplified model. [5]   
OR 
Explain how does: 
(a) A primary succession starts on a bare rock and reach a climax community? 
(b) The algal bloom eventually chokes the water body in an industrial area? 
 
29. The following is the illustration of the sequence of ovarian events (a-i) in a human 
female.  [5]                                                                                                                                                               
 
(i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it 
represents. 
(ii) Name the ovarian hormone and the pituitary hormone that have caused the above 
mentioned event. 
(iii) Explain the changes that occur in the uterus simultaneously in anticipation. 
(iv) Write the difference between ‘c’ and ‘h’. 
(v) Draw a labelled sketch of the structure of a human ovum prior to fertilization. 
OR 
How does the megaspore mother cell develop into 7- celled, 8 nucleate embryo sac in an 
angiosperm? Draw a labelled diagram of a mature embryo sac.  
 
30. What is the inheritance pattern observed in the size of starch grains and seed shape of 
Pisum sativum? Work out the monohybrid cross showing the above traits.  How does 
this pattern of inheritance deviate from that of Mendelian law of  dominance?     [5]  
OR 
State the aim and describe Messelson and Stahl’s experiment. 
 
 
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