CBSE Biology Outside Delhi Past year paper (Set - 1) - 2015, Class 12 | Additional Study Material for NEET PDF Download

 Page 1


  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
CBSE 
Class XII Biology 
Board Paper – 2015 – Outside Delhi (Set 1) 
Time: 3 hrs Total 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. How many chromosomes do drones of honey bees possess? Name the type of cell division 
involved in the production of sperms by them. [1] 
 
2. What is a cistron?  [1] 
 
3. Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral 
DNA. How is it possible?  [1] 
 
4. Why do children cured by enzyme-replacement therapy adenosine deaminase deficiency 
need periodic treatment? [1] 
 
5. List two advantages of the use of unleaded petrol in automobiles as fuel.  [1] 
 
 
  
Page 2


  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
CBSE 
Class XII Biology 
Board Paper – 2015 – Outside Delhi (Set 1) 
Time: 3 hrs Total 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. How many chromosomes do drones of honey bees possess? Name the type of cell division 
involved in the production of sperms by them. [1] 
 
2. What is a cistron?  [1] 
 
3. Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral 
DNA. How is it possible?  [1] 
 
4. Why do children cured by enzyme-replacement therapy adenosine deaminase deficiency 
need periodic treatment? [1] 
 
5. List two advantages of the use of unleaded petrol in automobiles as fuel.  [1] 
 
 
  
  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
SECTION B 
 
6. Why do moss plants produce very large number of male gametes? Provide one reason. 
What are these gametes called?  [2] 
 
7.       [2] 
(a) Select the homologous structures from the combinations given below: 
(i) Forelimbs of whales and bats 
(ii) Tuber of potato and sweet potato 
(iii) Eyes of octopus and mammals 
(iv) Thorns of Bougainvillea and tendrils of Cucurbita 
(b) State the kind of evolution they represent. 
 
8.  [2] 
(a) Why are the plants raised through micropropagation are termed as somaclones? 
(b) Mention two advantages of this technique. 
 
9. Explain the different steps involved during primary treatment phase of sewage.   [2] 
 
10. What is mutualism? Mention any two examples where the organisms involved are 
commercially exploited in agriculture. [2] 
OR 
 List any four techniques where the principle of ex-situ conservation of biodiversity has 
been employed. [2] 
 
SECTION C 
 
11. State what is apomixis. Comment on its significance. How can it be commercially used? [3] 
 
12. During a monohybrid cross involving a tall pea plant with a dwarf pea plant, the offspring 
populations were tall and dwarf in equal ratio. Work out a cross to show how it is possible.  
 [3] 
 
13. Explain the significance of satellite DNA in DNA fingerprinting technique. [3] 
 
14. What does the following equation represent? Explain. [3] 
 
? ? ?
22
p 2pq q 1 
  
Page 3


  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
CBSE 
Class XII Biology 
Board Paper – 2015 – Outside Delhi (Set 1) 
Time: 3 hrs Total 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. How many chromosomes do drones of honey bees possess? Name the type of cell division 
involved in the production of sperms by them. [1] 
 
2. What is a cistron?  [1] 
 
3. Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral 
DNA. How is it possible?  [1] 
 
4. Why do children cured by enzyme-replacement therapy adenosine deaminase deficiency 
need periodic treatment? [1] 
 
5. List two advantages of the use of unleaded petrol in automobiles as fuel.  [1] 
 
 
  
  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
SECTION B 
 
6. Why do moss plants produce very large number of male gametes? Provide one reason. 
What are these gametes called?  [2] 
 
7.       [2] 
(a) Select the homologous structures from the combinations given below: 
(i) Forelimbs of whales and bats 
(ii) Tuber of potato and sweet potato 
(iii) Eyes of octopus and mammals 
(iv) Thorns of Bougainvillea and tendrils of Cucurbita 
(b) State the kind of evolution they represent. 
 
8.  [2] 
(a) Why are the plants raised through micropropagation are termed as somaclones? 
(b) Mention two advantages of this technique. 
 
9. Explain the different steps involved during primary treatment phase of sewage.   [2] 
 
10. What is mutualism? Mention any two examples where the organisms involved are 
commercially exploited in agriculture. [2] 
OR 
 List any four techniques where the principle of ex-situ conservation of biodiversity has 
been employed. [2] 
 
SECTION C 
 
11. State what is apomixis. Comment on its significance. How can it be commercially used? [3] 
 
12. During a monohybrid cross involving a tall pea plant with a dwarf pea plant, the offspring 
populations were tall and dwarf in equal ratio. Work out a cross to show how it is possible.  
 [3] 
 
13. Explain the significance of satellite DNA in DNA fingerprinting technique. [3] 
 
14. What does the following equation represent? Explain. [3] 
 
? ? ?
22
p 2pq q 1 
  
  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
15. A heavily bleeding and bruised road accident victim was brought to a nursing home. The 
doctor immediately gave him an injection to protect him against a deadly disease. [3] 
(a) Write what did the doctor inject into the patient’s body. 
(b) How do you think this injection would protect the patient against the disease? 
(c) Name the disease against which this injection was given and the kind of immunity it 
provides. 
 
16. Enumerate any six essentials of good, effective Dairy Farm Management Practices. [3] 
 
17. State the medicinal value and the bioactive molecules produced by Streptococcus, Monascus 
and Trichoderma.  [3]  
OR 
 What are methanogens? How do they help to generate biogas? [3] 
 
18. Rearrange the following in the correct sequence to accomplish an important biological 
reaction: [3] 
(a) In vitro synthesis of copies of DNA of interest 
(b) Chemically synthesized oligonucleotides 
(c) Enzyme DNA-polymerase 
(d) Complementary region of DNA 
(e) Genomic DNA template 
(f) Nucleotides provided 
(g) Primers 
(h) Thermostable DNA-polymerase (from Thermus aquaticus) 
(i) Denaturation of ds-DNA 
 
19. Describe any three potential applications of genetically modified plants. [3] 
 
20. How did an American Company, Eli Lilly use the knowledge of r-DNA technology to 
produce human insulin? [3] 
 
21. How do snails, seeds, bears, zooplanktons, fungi and bacteria adapt to conditions 
unfavourable for their survival? [3] 
 
22. With the help of a flow hart, show the phenomenon of biomagnifications of DDT in an 
aquatic food chain. [3] 
 
  
Page 4


  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
CBSE 
Class XII Biology 
Board Paper – 2015 – Outside Delhi (Set 1) 
Time: 3 hrs Total 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. How many chromosomes do drones of honey bees possess? Name the type of cell division 
involved in the production of sperms by them. [1] 
 
2. What is a cistron?  [1] 
 
3. Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral 
DNA. How is it possible?  [1] 
 
4. Why do children cured by enzyme-replacement therapy adenosine deaminase deficiency 
need periodic treatment? [1] 
 
5. List two advantages of the use of unleaded petrol in automobiles as fuel.  [1] 
 
 
  
  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
SECTION B 
 
6. Why do moss plants produce very large number of male gametes? Provide one reason. 
What are these gametes called?  [2] 
 
7.       [2] 
(a) Select the homologous structures from the combinations given below: 
(i) Forelimbs of whales and bats 
(ii) Tuber of potato and sweet potato 
(iii) Eyes of octopus and mammals 
(iv) Thorns of Bougainvillea and tendrils of Cucurbita 
(b) State the kind of evolution they represent. 
 
8.  [2] 
(a) Why are the plants raised through micropropagation are termed as somaclones? 
(b) Mention two advantages of this technique. 
 
9. Explain the different steps involved during primary treatment phase of sewage.   [2] 
 
10. What is mutualism? Mention any two examples where the organisms involved are 
commercially exploited in agriculture. [2] 
OR 
 List any four techniques where the principle of ex-situ conservation of biodiversity has 
been employed. [2] 
 
SECTION C 
 
11. State what is apomixis. Comment on its significance. How can it be commercially used? [3] 
 
12. During a monohybrid cross involving a tall pea plant with a dwarf pea plant, the offspring 
populations were tall and dwarf in equal ratio. Work out a cross to show how it is possible.  
 [3] 
 
13. Explain the significance of satellite DNA in DNA fingerprinting technique. [3] 
 
14. What does the following equation represent? Explain. [3] 
 
? ? ?
22
p 2pq q 1 
  
  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
15. A heavily bleeding and bruised road accident victim was brought to a nursing home. The 
doctor immediately gave him an injection to protect him against a deadly disease. [3] 
(a) Write what did the doctor inject into the patient’s body. 
(b) How do you think this injection would protect the patient against the disease? 
(c) Name the disease against which this injection was given and the kind of immunity it 
provides. 
 
16. Enumerate any six essentials of good, effective Dairy Farm Management Practices. [3] 
 
17. State the medicinal value and the bioactive molecules produced by Streptococcus, Monascus 
and Trichoderma.  [3]  
OR 
 What are methanogens? How do they help to generate biogas? [3] 
 
18. Rearrange the following in the correct sequence to accomplish an important biological 
reaction: [3] 
(a) In vitro synthesis of copies of DNA of interest 
(b) Chemically synthesized oligonucleotides 
(c) Enzyme DNA-polymerase 
(d) Complementary region of DNA 
(e) Genomic DNA template 
(f) Nucleotides provided 
(g) Primers 
(h) Thermostable DNA-polymerase (from Thermus aquaticus) 
(i) Denaturation of ds-DNA 
 
19. Describe any three potential applications of genetically modified plants. [3] 
 
20. How did an American Company, Eli Lilly use the knowledge of r-DNA technology to 
produce human insulin? [3] 
 
21. How do snails, seeds, bears, zooplanktons, fungi and bacteria adapt to conditions 
unfavourable for their survival? [3] 
 
22. With the help of a flow hart, show the phenomenon of biomagnifications of DDT in an 
aquatic food chain. [3] 
 
  
  
 
CBSE XII  |  Biology 
Board Paper – 2015 – Outside Delhi – Set 1 
 
     
 
SECTION D 
 
23. Your school has been selected by the Department of Education to organize and host an 
interschool seminar on “Reproductive Health – Problems and Practices”. However, many 
parents are reluctant to permit their wards to attend it. Their argument is that the topic is 
“too embarrassing.” 
 Put forth four arguments with appropriate reasons and explanation to justify the topic to 
be very essential and timely. [4] 
 
SECTION E 
 
24.  [5] 
(a) Plan an experiment and prepare a flow chart of the steps that you would follow to 
ensure that the seeds are formed only from the desired sets of pollen grains. Name the 
type of experiment that you carried out. 
(b) Write the importance of such experiments. 
OR 
 Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human 
female. [5] 
 
25.  [5] 
(a) Why are thalassemia and haemophilia categorized as Mendelian disorders? Write the 
symptoms of these diseases. Explain their pattern of inheritance in humans. 
(b) Write the genotypes of the normal parents producing a haemophilic son. 
OR 
 How do m-RNA, t-RNA and ribosomes help in the process of translation? [5] 
 
26.  [5] 
(a) List the different attributes that a population has and not an individual organism. 
(b) What is population density? Explain any three different ways the population density 
can be measured, with the help of an example each. 
OR 
 “It is often said that the pyramid of energy is always upright. On the other hand, the 
pyramid of biomass can be both upright and inverted.” 
 Explain with the help if examples and sketches. [5]