CBSE Biology All India Past year paper - 2017, Class 12 | Additional Study Material for NEET PDF Download

 Page 1


  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
CBSE 
 Class XII Biology (Theory) 
Board Paper 2017 All India (Set 1) 
Time allowed: 3 hrs Maximum Marks: 70 
 
 
General Instructions: 
 
1. There are total 26 questions and five sections in the question paper. 
All questions are compulsory. 
2. Section A contains questions number 1 to 5; very short answer type questions 
of 1 mark each. 
3. Section B contains questions number 6 to 10, short-answer type I questions of 
2 marks each. 
4. Section C contains questions number 11 to 22, short answer type II questions 
of 3 marks each. 
5. Section D contains question number 23, value based question of 4 marks. 
6. Section E contains questions number 24 to 26, long-answer type questions of 5 
marks each. 
7. There is no overall choice in the question paper; however, an internal choice is 
provided in one question of 2 marks, one question of 3 marks and all the three 
questions of 5 marks. In these questions, an examinee is to attempt any of the 
two given alternatives. 
 
 
SECTION A 
1. Name the type of cross that would help to find the genotype of a pea plant 
bearing violet flowers. [1] 
 
2. State two postulates of Oparin and Haldane with reference to origin of life.[1] 
 
3. A herd of cattle is showing reduced fertility and productivity. Provide one 
reason and one suggestion to overcome this problem [1] 
 
4. What are Cry genes? In which organism are they present? [1] 
 
5. An electrostatic precipitator in a thermal power plant is not able to generate 
high voltage of several thousands. Write the ecological implication because of 
it. [1] 
 
  
Page 2


  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
CBSE 
 Class XII Biology (Theory) 
Board Paper 2017 All India (Set 1) 
Time allowed: 3 hrs Maximum Marks: 70 
 
 
General Instructions: 
 
1. There are total 26 questions and five sections in the question paper. 
All questions are compulsory. 
2. Section A contains questions number 1 to 5; very short answer type questions 
of 1 mark each. 
3. Section B contains questions number 6 to 10, short-answer type I questions of 
2 marks each. 
4. Section C contains questions number 11 to 22, short answer type II questions 
of 3 marks each. 
5. Section D contains question number 23, value based question of 4 marks. 
6. Section E contains questions number 24 to 26, long-answer type questions of 5 
marks each. 
7. There is no overall choice in the question paper; however, an internal choice is 
provided in one question of 2 marks, one question of 3 marks and all the three 
questions of 5 marks. In these questions, an examinee is to attempt any of the 
two given alternatives. 
 
 
SECTION A 
1. Name the type of cross that would help to find the genotype of a pea plant 
bearing violet flowers. [1] 
 
2. State two postulates of Oparin and Haldane with reference to origin of life.[1] 
 
3. A herd of cattle is showing reduced fertility and productivity. Provide one 
reason and one suggestion to overcome this problem [1] 
 
4. What are Cry genes? In which organism are they present? [1] 
 
5. An electrostatic precipitator in a thermal power plant is not able to generate 
high voltage of several thousands. Write the ecological implication because of 
it. [1] 
 
  
  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
SECTION B 
 
6. A pollen grain in angiosperm at the time of dehiscence from an anther could 
be 2-celled or 3-celled. Explain. How are the cells placed within the pollen 
grain when shed at a 2-celled stage? [2] 
 
7. Differentiate between the genetic codes given below: [2] 
(a) Unambiguous and Universal 
(b) Degenerate and Initiator 
8. Mention one application for each of the following: [2] 
(a) Passive immunisation 
(b) Antihistamine 
(c) Colostrum 
(d) Cytokinin-barrier 
 
9. Name the microbes that help production of the following products 
commercially: [2] 
(a) Statin 
(b) Citric acid 
(c) Penicillin 
(d) Butyric acid 
 
10. List four benefits to human life by eliminating the use of CFCs. [2] 
OR 
Suggest two practices giving one example of each that help protect rare or 
threatened species. 
 
SECTION C 
 
11.  
(a) Can a plant flowering in Mumbai be pollinated by pollen grains of the 
same species growing in New Delhi? Provide explanations to your answer. 
(b) Draw the diagram of a pistil where pollination has successfully occurred. 
Label the parts involved in reaching the male gametes to its desired 
destination. [3] 
 
12. Both Haemophilia and Thalassemia are blood related disorders in humans. 
Write their causes and the difference between the two. Name the category 
of genetic disorder they both come under. [3] 
 
13.  
(a) List the two methodologies which were involved in human genome 
project. Mention how they were used. 
(b) Expand „YAC? and mention what was it used for. [3] 
Page 3


  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
CBSE 
 Class XII Biology (Theory) 
Board Paper 2017 All India (Set 1) 
Time allowed: 3 hrs Maximum Marks: 70 
 
 
General Instructions: 
 
1. There are total 26 questions and five sections in the question paper. 
All questions are compulsory. 
2. Section A contains questions number 1 to 5; very short answer type questions 
of 1 mark each. 
3. Section B contains questions number 6 to 10, short-answer type I questions of 
2 marks each. 
4. Section C contains questions number 11 to 22, short answer type II questions 
of 3 marks each. 
5. Section D contains question number 23, value based question of 4 marks. 
6. Section E contains questions number 24 to 26, long-answer type questions of 5 
marks each. 
7. There is no overall choice in the question paper; however, an internal choice is 
provided in one question of 2 marks, one question of 3 marks and all the three 
questions of 5 marks. In these questions, an examinee is to attempt any of the 
two given alternatives. 
 
 
SECTION A 
1. Name the type of cross that would help to find the genotype of a pea plant 
bearing violet flowers. [1] 
 
2. State two postulates of Oparin and Haldane with reference to origin of life.[1] 
 
3. A herd of cattle is showing reduced fertility and productivity. Provide one 
reason and one suggestion to overcome this problem [1] 
 
4. What are Cry genes? In which organism are they present? [1] 
 
5. An electrostatic precipitator in a thermal power plant is not able to generate 
high voltage of several thousands. Write the ecological implication because of 
it. [1] 
 
  
  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
SECTION B 
 
6. A pollen grain in angiosperm at the time of dehiscence from an anther could 
be 2-celled or 3-celled. Explain. How are the cells placed within the pollen 
grain when shed at a 2-celled stage? [2] 
 
7. Differentiate between the genetic codes given below: [2] 
(a) Unambiguous and Universal 
(b) Degenerate and Initiator 
8. Mention one application for each of the following: [2] 
(a) Passive immunisation 
(b) Antihistamine 
(c) Colostrum 
(d) Cytokinin-barrier 
 
9. Name the microbes that help production of the following products 
commercially: [2] 
(a) Statin 
(b) Citric acid 
(c) Penicillin 
(d) Butyric acid 
 
10. List four benefits to human life by eliminating the use of CFCs. [2] 
OR 
Suggest two practices giving one example of each that help protect rare or 
threatened species. 
 
SECTION C 
 
11.  
(a) Can a plant flowering in Mumbai be pollinated by pollen grains of the 
same species growing in New Delhi? Provide explanations to your answer. 
(b) Draw the diagram of a pistil where pollination has successfully occurred. 
Label the parts involved in reaching the male gametes to its desired 
destination. [3] 
 
12. Both Haemophilia and Thalassemia are blood related disorders in humans. 
Write their causes and the difference between the two. Name the category 
of genetic disorder they both come under. [3] 
 
13.  
(a) List the two methodologies which were involved in human genome 
project. Mention how they were used. 
(b) Expand „YAC? and mention what was it used for. [3] 
  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
14. Write the characteristics of Ramapithecus, Dryopithecus and Neanderthal 
man. [3] 
 
15. Name a human disease, its causal organism, symptoms (any three) and 
vector, spread by intake of water and food contaminated by human faecal 
matter. [3] 
OR 
(a) Why is there a fear amongst the guardians that their adolescent wards 
may get trapped in drug/alcohol abuse? 
(b) Explain „addiction? and „dependence? in respect of drug/alcohol abuse in 
youth. [3] 
 
16.  
(a) Write the desirable characters a farmer looks for in his sugarcane crop. 
(b) How did plant breeding techniques help north Indian farmers to develop 
cane with desired characters? [3] 
 
17. Secondary treatment of the sewage is also called Biological treatment. 
Justify this statement and explain the process. [3] 
18.  
(a) Explain the significance of „palindromic nucleotide sequence? in the 
formation of recombinant DNA. 
(b) Write the use of restriction endonuclease in the above process. [3] 
 
19. Describe the roles of heat, primers and the bacterium Thermus aquaticus in 
the process of PCR. [3] 
 
20. Explain the various steps involved in the production of artificial insulin. [3] 
 
21.  
(a) “Organisms may be conformers or regulators.” Explain this statement and 
give one example of each. 
(b) Why are there more conformers than regulators in the animal world? [3] 
22. Describe the inter-relationship between productivity, gross primary 
productivity and net productivity. [3] 
 
  
Page 4


  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
CBSE 
 Class XII Biology (Theory) 
Board Paper 2017 All India (Set 1) 
Time allowed: 3 hrs Maximum Marks: 70 
 
 
General Instructions: 
 
1. There are total 26 questions and five sections in the question paper. 
All questions are compulsory. 
2. Section A contains questions number 1 to 5; very short answer type questions 
of 1 mark each. 
3. Section B contains questions number 6 to 10, short-answer type I questions of 
2 marks each. 
4. Section C contains questions number 11 to 22, short answer type II questions 
of 3 marks each. 
5. Section D contains question number 23, value based question of 4 marks. 
6. Section E contains questions number 24 to 26, long-answer type questions of 5 
marks each. 
7. There is no overall choice in the question paper; however, an internal choice is 
provided in one question of 2 marks, one question of 3 marks and all the three 
questions of 5 marks. In these questions, an examinee is to attempt any of the 
two given alternatives. 
 
 
SECTION A 
1. Name the type of cross that would help to find the genotype of a pea plant 
bearing violet flowers. [1] 
 
2. State two postulates of Oparin and Haldane with reference to origin of life.[1] 
 
3. A herd of cattle is showing reduced fertility and productivity. Provide one 
reason and one suggestion to overcome this problem [1] 
 
4. What are Cry genes? In which organism are they present? [1] 
 
5. An electrostatic precipitator in a thermal power plant is not able to generate 
high voltage of several thousands. Write the ecological implication because of 
it. [1] 
 
  
  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
SECTION B 
 
6. A pollen grain in angiosperm at the time of dehiscence from an anther could 
be 2-celled or 3-celled. Explain. How are the cells placed within the pollen 
grain when shed at a 2-celled stage? [2] 
 
7. Differentiate between the genetic codes given below: [2] 
(a) Unambiguous and Universal 
(b) Degenerate and Initiator 
8. Mention one application for each of the following: [2] 
(a) Passive immunisation 
(b) Antihistamine 
(c) Colostrum 
(d) Cytokinin-barrier 
 
9. Name the microbes that help production of the following products 
commercially: [2] 
(a) Statin 
(b) Citric acid 
(c) Penicillin 
(d) Butyric acid 
 
10. List four benefits to human life by eliminating the use of CFCs. [2] 
OR 
Suggest two practices giving one example of each that help protect rare or 
threatened species. 
 
SECTION C 
 
11.  
(a) Can a plant flowering in Mumbai be pollinated by pollen grains of the 
same species growing in New Delhi? Provide explanations to your answer. 
(b) Draw the diagram of a pistil where pollination has successfully occurred. 
Label the parts involved in reaching the male gametes to its desired 
destination. [3] 
 
12. Both Haemophilia and Thalassemia are blood related disorders in humans. 
Write their causes and the difference between the two. Name the category 
of genetic disorder they both come under. [3] 
 
13.  
(a) List the two methodologies which were involved in human genome 
project. Mention how they were used. 
(b) Expand „YAC? and mention what was it used for. [3] 
  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
14. Write the characteristics of Ramapithecus, Dryopithecus and Neanderthal 
man. [3] 
 
15. Name a human disease, its causal organism, symptoms (any three) and 
vector, spread by intake of water and food contaminated by human faecal 
matter. [3] 
OR 
(a) Why is there a fear amongst the guardians that their adolescent wards 
may get trapped in drug/alcohol abuse? 
(b) Explain „addiction? and „dependence? in respect of drug/alcohol abuse in 
youth. [3] 
 
16.  
(a) Write the desirable characters a farmer looks for in his sugarcane crop. 
(b) How did plant breeding techniques help north Indian farmers to develop 
cane with desired characters? [3] 
 
17. Secondary treatment of the sewage is also called Biological treatment. 
Justify this statement and explain the process. [3] 
18.  
(a) Explain the significance of „palindromic nucleotide sequence? in the 
formation of recombinant DNA. 
(b) Write the use of restriction endonuclease in the above process. [3] 
 
19. Describe the roles of heat, primers and the bacterium Thermus aquaticus in 
the process of PCR. [3] 
 
20. Explain the various steps involved in the production of artificial insulin. [3] 
 
21.  
(a) “Organisms may be conformers or regulators.” Explain this statement and 
give one example of each. 
(b) Why are there more conformers than regulators in the animal world? [3] 
22. Describe the inter-relationship between productivity, gross primary 
productivity and net productivity. [3] 
 
  
  
 
CBSE XII  |  Biology 
Board Paper 2017 – All India – Set 1 
 
     
SECTION D 
23. It is commonly observed that parents feel embarrassed to discuss freely 
with their adolescent children about sexuality and reproduction. The result 
of this parental inhibition is that the children go astray sometimes. 
(a) Explain the reasons that you feel are behind such embarrassment 
amongst some parents to freely discuss such issues with their growing 
children. 
(b) By taking one example of a local plant and animal, how would you help 
these parents to overcome such inhibitions about reproduction and 
sexuality? [4] 
 
SECTION E 
24.  
(a) When a seed of an orange is squeezed, many embryos, instead of one are 
observed. Explain how it is possible. 
(b) Are these embryos genetically similar or different? Comment. [3+2=5] 
OR 
(a) Explain the following phases in the menstrual cycle of a human female: 
i. Menstrual phase 
ii. Follicular phase 
iii. Luteal phase 
 
(b) A proper understanding of menstrual cycle can help immensely in family 
planning. Do you agree with the statement? Provide reasons for your 
answer. [4+1=5]  
 
25.  
(a) Compare, giving reasons, the J-shaped and S-shaped models of 
population growth of a species. 
(b) Explain “fitness of a species” as mentioned by Darwin. [3+2=5] 
OR 
(a) What is an ecological pyramid? Compare the pyramids of energy, biomass 
and numbers. 
(b) Write any two limitations of ecological pyramids. [4+1=5] 
 
26.  
(a) Describe the structure and function of a t-RNA molecule. Why is it 
referred to as an adapter molecule? 
(b) Explain the process of splicing of hn-RNA in a eukaryotic cell. [3+2=5] 
OR 
Write the different components of a lac-operon in E.coli. Explain its 
expression while in an „open? state. [5]