CBSE Biology Past year paper Delhi (Set - 1) - 2011, Class 12 | Additional Study Material for NEET PDF Download

 Page 1


  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 CBSE  
 Class XII Biology (Theory) 
Board Paper 2011 – 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. Name the type of cell division that takes place in the zygote of an organism exhibiting 
haplontic life cycle. [1] 
 
2. Write the scientific name of the microbe used for fermenting malted cereals and fruit 
juices. [1] 
 
3. Write the unit used for measuring ozone thickness.  [1] 
 
4. Name the event during cell division cycle that results in the gain or loss of  
chromosome. [1] 
 
5. How can bacterial DNA be released from the bacterial cell for biotechnology 
experiments? [1] 
 
6. Write the importance of cryopreservation in conservation of biodiversity. [1] 
 
7. Mention the role of the codons AUG and UGA during protein synthesis. [1] 
 
8. Normally one embryo develops in one seed but when an orange seed is squeezed many 
embryos of different shapes and sizes are seen. Mention how it has happened.  [1] 
 
 
 
 
 
 
Page 2


  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 CBSE  
 Class XII Biology (Theory) 
Board Paper 2011 – 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. Name the type of cell division that takes place in the zygote of an organism exhibiting 
haplontic life cycle. [1] 
 
2. Write the scientific name of the microbe used for fermenting malted cereals and fruit 
juices. [1] 
 
3. Write the unit used for measuring ozone thickness.  [1] 
 
4. Name the event during cell division cycle that results in the gain or loss of  
chromosome. [1] 
 
5. How can bacterial DNA be released from the bacterial cell for biotechnology 
experiments? [1] 
 
6. Write the importance of cryopreservation in conservation of biodiversity. [1] 
 
7. Mention the role of the codons AUG and UGA during protein synthesis. [1] 
 
8. Normally one embryo develops in one seed but when an orange seed is squeezed many 
embryos of different shapes and sizes are seen. Mention how it has happened.  [1] 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
SECTION-B 
 
9. How do histones acquire positive charge? [2] 
 
10.  Why is CuT considered a good contraceptive device to space children? [2] 
 
11.  Differentiate between albuminous and non-albuminous seeds, giving one example of 
each.  [2] 
 
12.  Explain the process of RNA interference. [2] 
 
13.  List the key tools used in recombinant DNA technology. [2] 
 
14.  Name the two types of immune systems in a human body. Why are cell mediated and 
humoral immunities so called? [2] 
OR 
Write the scientific names of the causal organisms of elephantiasis and ringworm in 
humans. Mention the body parts affected by them. 
 
15.  Justify with the help of an example where a deliberate attempt by humans has led to 
the extinction of a particular species.  [2] 
 
16. Identify A, D, E and F in the diagram of an antibody molecule given below : [2] 
 
 
 
 
 
 
Page 3


  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 CBSE  
 Class XII Biology (Theory) 
Board Paper 2011 – 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. Name the type of cell division that takes place in the zygote of an organism exhibiting 
haplontic life cycle. [1] 
 
2. Write the scientific name of the microbe used for fermenting malted cereals and fruit 
juices. [1] 
 
3. Write the unit used for measuring ozone thickness.  [1] 
 
4. Name the event during cell division cycle that results in the gain or loss of  
chromosome. [1] 
 
5. How can bacterial DNA be released from the bacterial cell for biotechnology 
experiments? [1] 
 
6. Write the importance of cryopreservation in conservation of biodiversity. [1] 
 
7. Mention the role of the codons AUG and UGA during protein synthesis. [1] 
 
8. Normally one embryo develops in one seed but when an orange seed is squeezed many 
embryos of different shapes and sizes are seen. Mention how it has happened.  [1] 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
SECTION-B 
 
9. How do histones acquire positive charge? [2] 
 
10.  Why is CuT considered a good contraceptive device to space children? [2] 
 
11.  Differentiate between albuminous and non-albuminous seeds, giving one example of 
each.  [2] 
 
12.  Explain the process of RNA interference. [2] 
 
13.  List the key tools used in recombinant DNA technology. [2] 
 
14.  Name the two types of immune systems in a human body. Why are cell mediated and 
humoral immunities so called? [2] 
OR 
Write the scientific names of the causal organisms of elephantiasis and ringworm in 
humans. Mention the body parts affected by them. 
 
15.  Justify with the help of an example where a deliberate attempt by humans has led to 
the extinction of a particular species.  [2] 
 
16. Identify A, D, E and F in the diagram of an antibody molecule given below : [2] 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 
17.  Study the graph given below. Explain how is oxygen concentration affected in the river 
when sewage is discharged into it. [2] 
 
 
18.  Explain how a hereditary disease can be corrected. Give an example of first successful 
attempt made towards correction of such diseases.  [2] 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 4


  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 CBSE  
 Class XII Biology (Theory) 
Board Paper 2011 – 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. Name the type of cell division that takes place in the zygote of an organism exhibiting 
haplontic life cycle. [1] 
 
2. Write the scientific name of the microbe used for fermenting malted cereals and fruit 
juices. [1] 
 
3. Write the unit used for measuring ozone thickness.  [1] 
 
4. Name the event during cell division cycle that results in the gain or loss of  
chromosome. [1] 
 
5. How can bacterial DNA be released from the bacterial cell for biotechnology 
experiments? [1] 
 
6. Write the importance of cryopreservation in conservation of biodiversity. [1] 
 
7. Mention the role of the codons AUG and UGA during protein synthesis. [1] 
 
8. Normally one embryo develops in one seed but when an orange seed is squeezed many 
embryos of different shapes and sizes are seen. Mention how it has happened.  [1] 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
SECTION-B 
 
9. How do histones acquire positive charge? [2] 
 
10.  Why is CuT considered a good contraceptive device to space children? [2] 
 
11.  Differentiate between albuminous and non-albuminous seeds, giving one example of 
each.  [2] 
 
12.  Explain the process of RNA interference. [2] 
 
13.  List the key tools used in recombinant DNA technology. [2] 
 
14.  Name the two types of immune systems in a human body. Why are cell mediated and 
humoral immunities so called? [2] 
OR 
Write the scientific names of the causal organisms of elephantiasis and ringworm in 
humans. Mention the body parts affected by them. 
 
15.  Justify with the help of an example where a deliberate attempt by humans has led to 
the extinction of a particular species.  [2] 
 
16. Identify A, D, E and F in the diagram of an antibody molecule given below : [2] 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 
17.  Study the graph given below. Explain how is oxygen concentration affected in the river 
when sewage is discharged into it. [2] 
 
 
18.  Explain how a hereditary disease can be corrected. Give an example of first successful 
attempt made towards correction of such diseases.  [2] 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
SECTION-C 
 
19.  Draw a diagram of a male gametophyte of an angiosperm. Label any four parts. Why is 
sporopollenin considered the most resistant organic material?  [3] 
 
20.  How are dominance, codominance and incomplete dominance patterns of inheritance 
different from each other?  [3] 
 
21.  The base sequence in one of the strands of DNA is TAGCATGAT [3] 
(i) Give the base sequence of its complementary strand. 
(ii) How are these base pairs held together in a DNA molecule? 
(iii) Explain the base complementarity rules. Name the scientist who framed this rule. 
 
22.    [3] 
(a) Sickle celled anaemia in humans is a result of point mutation. Explain.  
(b) Write the genotypes of both the parents who have produced a sickle celled anaemic 
offspring. 
 
23.  What is inbreeding depression and how is it caused in organisms? Write any two 
advantages of inbreeding. [3] 
 
24.     [3] 
(a) Identify (A) and (B) illustrations in the following : 
 
(b) Write the term given to (A) and (C) and why? 
(c) Expand PCR. Mention its importance in biotechnology. 
 
 
 
  
Page 5


  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 CBSE  
 Class XII Biology (Theory) 
Board Paper 2011 – 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. Name the type of cell division that takes place in the zygote of an organism exhibiting 
haplontic life cycle. [1] 
 
2. Write the scientific name of the microbe used for fermenting malted cereals and fruit 
juices. [1] 
 
3. Write the unit used for measuring ozone thickness.  [1] 
 
4. Name the event during cell division cycle that results in the gain or loss of  
chromosome. [1] 
 
5. How can bacterial DNA be released from the bacterial cell for biotechnology 
experiments? [1] 
 
6. Write the importance of cryopreservation in conservation of biodiversity. [1] 
 
7. Mention the role of the codons AUG and UGA during protein synthesis. [1] 
 
8. Normally one embryo develops in one seed but when an orange seed is squeezed many 
embryos of different shapes and sizes are seen. Mention how it has happened.  [1] 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
SECTION-B 
 
9. How do histones acquire positive charge? [2] 
 
10.  Why is CuT considered a good contraceptive device to space children? [2] 
 
11.  Differentiate between albuminous and non-albuminous seeds, giving one example of 
each.  [2] 
 
12.  Explain the process of RNA interference. [2] 
 
13.  List the key tools used in recombinant DNA technology. [2] 
 
14.  Name the two types of immune systems in a human body. Why are cell mediated and 
humoral immunities so called? [2] 
OR 
Write the scientific names of the causal organisms of elephantiasis and ringworm in 
humans. Mention the body parts affected by them. 
 
15.  Justify with the help of an example where a deliberate attempt by humans has led to 
the extinction of a particular species.  [2] 
 
16. Identify A, D, E and F in the diagram of an antibody molecule given below : [2] 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
 
17.  Study the graph given below. Explain how is oxygen concentration affected in the river 
when sewage is discharged into it. [2] 
 
 
18.  Explain how a hereditary disease can be corrected. Give an example of first successful 
attempt made towards correction of such diseases.  [2] 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
SECTION-C 
 
19.  Draw a diagram of a male gametophyte of an angiosperm. Label any four parts. Why is 
sporopollenin considered the most resistant organic material?  [3] 
 
20.  How are dominance, codominance and incomplete dominance patterns of inheritance 
different from each other?  [3] 
 
21.  The base sequence in one of the strands of DNA is TAGCATGAT [3] 
(i) Give the base sequence of its complementary strand. 
(ii) How are these base pairs held together in a DNA molecule? 
(iii) Explain the base complementarity rules. Name the scientist who framed this rule. 
 
22.    [3] 
(a) Sickle celled anaemia in humans is a result of point mutation. Explain.  
(b) Write the genotypes of both the parents who have produced a sickle celled anaemic 
offspring. 
 
23.  What is inbreeding depression and how is it caused in organisms? Write any two 
advantages of inbreeding. [3] 
 
24.     [3] 
(a) Identify (A) and (B) illustrations in the following : 
 
(b) Write the term given to (A) and (C) and why? 
(c) Expand PCR. Mention its importance in biotechnology. 
 
 
 
  
  
 
CBSE XII  |  Biology 
Board Paper 2011 – Delhi – Set 1 
 
     
25.     [3] 
 
The diagram above is that of a typical biogas plant. Explain the sequence of events 
occurring in a biogas plant. Identify a, b and c.   
 
26.  How can crop varieties be made disease resistant to overcome food crisis in India? 
Explain. Name one disease resistant variety in India of:  [3] 
(a) Wheat to leaf and stripe rust 
(b) Brassica to white rust 
OR 
Write the source and the effect on the human body of the following drugs: 
(i) Morphine 
(ii) Cocaine 
(iii) Marijuana 
 
27.  Name the type of interaction seen in each of the following examples : [3] 
(i) Ascaris worms living in the intestine of human 
(ii) Wasp pollinating fig inflorescence 
(iii)  Clown fish living among the tentacles of sea-anemone 
(iv) Mycorrhizae living on the roots of higher plants 
(v) Orchid growing on a branch of a mango tree 
(vi) Disappearance of smaller barnacles when Balanus dominated in the Coast of 
Scotland.