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Biology All India Set 1 2016-2017 CBSE (Arts) Class 12 Question Paper Solution

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Biology [All India Set 1]
Marks: 70 Academic Year: 2016-2017
Date & Time: 4th April 2017, 12:30 pm
Duration: 3h
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  • Section A contains questions number 1 to 5, very short-answer type questions of 1 mark each.
  • Section B contains questions number 6 to 10, short-answer type I questions of 2 marks each.
  • Section C contains questions number 11 to 22, short-answer type II questions of 3 mark each.
  • Section D contains questions number 23, the value-based question of 4 marks
  • Section E contains questions number 24 to 26, long-answer type questions of 5 marks each.

SECTION-A
[1] 1

Answer the following question.
Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [2.01] Principles of Inheritance and Variation
[1] 2

Answer the following question.
State two postulates of Oparin and Haldane with reference to the origin of life.

Concept: Origin of Life
Chapter: [2.03] Evolution
[1] 3

Answer the following question.
A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[1] 4

Answer the following question.
What are Cry genes? In which organism are they present?

Concept: Organisms and Populations (Questions)
Chapter: [5.01] Organisms and Populations
[1] 5

Answer the following question.
An electrostatic precipitator in a thermal power plant is not able to generate a high voltage of several thousand. Write the ecological implication because of it.

Concept: Radioactive Waste Management and E-waste
Chapter: [5.04] Environmental Issues
SECTION-B
[2] 6

Answer the following question.
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?

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[2] 7
[1] 7.1

Differentiate between the genetic codes given below:
Unambiguous and Universal

Concept: Genetic Code - Introduction of Genetic Code
Chapter: [2.02] Molecular Basis of Inheritance
[1] 7.2

Differentiate between the genetic codes given below:
Degenerate and Initiator

Concept: Genetic Code - Introduction of Genetic Code
Chapter: [2.02] Molecular Basis of Inheritance
[2] 8

Mention one application of the following:
Passive immunization

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases

Mention one application of the following:
Antihistamine

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases

Mention one application of the following:
Colostrum

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases

Mention one application of the following:
Cytokinin-barrier

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[2] 9

Name the microbes that help the production of the following product commercially:
Statin

Concept: Microbes in Industrial Production
Chapter: [3.03] Microbes in Human Welfare

Name the microbes that help the production of the following product commercially:
Citric acid

Concept: Microbes in Household Products
Chapter: [3.03] Microbes in Human Welfare

Name the microbes that help the production of the following product commercially:
Penicillin

Concept: Microbes in Industrial Production
Chapter: [3.03] Microbes in Human Welfare

Name the microbes that help the production of the following product commercially:
Butyric acid

Concept: Introduction of Microbes in Human Welfare
Chapter: [3.03] Microbes in Human Welfare
[2] 10
[2] 10.1

Answer the following question.
List four benefits to human life by eliminating the use of CFCs.

Concept: Greenhouse Effect and Climate Change
Chapter: [5.04] Environmental Issues
OR
[2] 10.2

Answer the following question.
Suggest two practices giving one example of each that help protects rare or threatened species.

Concept: Biodiversity - Loss of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
SECTION-C
[3] 11
[2] 11.1

Answer the following question.
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1] 11.2

Answer the following question.
Draw the diagram of a pistil where pollination has successfully occurred. Label the parts involved in reaching the male gametes to its desired destination.

Concept: Pre-fertilisation - Structures and Events - The Pistil, Megasporangium (Ovule) and Embryo Sac
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3] 12

Answer the following question.
Both Haemophilia and Thalessemia 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.

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[3] 13
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[2] 13.1

Answer the following question.
List the two methodologies which were involved in the human genome project. Mention how they were used.

Concept: Human Genome Project
Chapter: [2.02] Molecular Basis of Inheritance
[1] 13.2

Answer the following question.
Expand ‘YAC’ and mention what it was used for.

Concept: Tools of Recombinant Dna Technology - Cloning Vectors
Chapter: [4.01] Biotechnology - Principles and Processes
[3] 14

Answer the following question.
Write the characteristics of Ramapithecus, Dryopithecus, and Neanderthal man.

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution
[3] 15
[3] 15.1

Answer the following question.
Name a human disease, its causal organism, symptoms (any three) and vector, spread by intake of water and food contaminated by human faecal matter.

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
OR
[3] 15.2
[2] 15.2.1

Answer the following question.
Why is there a fear amongst the guardians that their adolescent wards may get trapped in drug/alcohol abuse?

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
[1] 15.2.2

Answer the following question.
Explain ‘addiction’ and dependence’ in respect of drug/alcohol abuse in youth.

Concept: Drugs and Alcohol Abuse - Addiction and Dependence
Chapter: [3.01] Human Health and Diseases
[3] 16
[2] 16.1

Answer the following question.
Write the desirable characters a farmer looks for in his sugarcane crop.

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[1] 16.2

Answer the following question.
How did plant breeding techniques help north Indian farmers to develop cane with desired characters?

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[3] 17

Answer the following question.
Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.

Concept: Microbes in Sewage Treatment
Chapter: [3.03] Microbes in Human Welfare
[3] 18
[2] 18.1

Answer the following question.
Explain the significance of palindromic nucleotide sequence in the formation of recombinant DNA.

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[1] 18.2

Answer the following question.
Write the use of restriction endonuclease in the formation of recombinant DNA.

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[3] 19

Answer the following question.
Describe the roles of heat, primers, and the bacterium Thermus aquaticus in the process of PCR.

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Application
[3] 20

Answer the following question.
Explain the various steps involved in the production of artificial insulin.

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Application
[3] 21
[2] 21.1

Answer the following question.
‘‘Organisms may be conformers or regulators.’’ Explain this statement and give one example of each.

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [5.01] Organisms and Populations
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[1] 21.2

Answer the following question.
Why are there more conformers than regulators in the animal world?

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [5.01] Organisms and Populations
[3] 22

Answer the following question.
Describe the inter-relationship between productivity, gross primary productivity, and net productivity.

Concept: Productivity
Chapter: [5.02] Ecosystem
SECTION -D
[4] 23
[2] 23.1

Answer the following question.
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.
Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.

Concept: Introduction of Sexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[2] 23.2

Answer the following question.
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.
By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality?

Concept: Reproduction in Organisms (Questions)
Chapter: [1.01] Reproduction in Organisms
SECTION -E
[5] 24
[3] 24.1

Answer the following question.
When a seed of orange is squeezed, many embryos, instead of one are observed. Explain how it is possible.

Concept: Apomixis And Polyembryony
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2] 24.2

Answer the following question.
Are these embryos genetically similar or different? Comment.

Concept: Post-fertilisation : Structures and Events - Embryo
Chapter: [1.02] Sexual Reproduction in Flowering Plants
OR
[3] 24.3

Answer the following question.
Explain the following phases in the menstrual cycle of a human female:
(i) Menstrual phase
(ii) Follicular phase
(iii) Luteal phase

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[2] 24.4

Answer the following question.
A proper understanding of the menstrual cycle can help immensely in family planning. Do you agree with the statement? Provide reasons for your answer.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[5] 25
[3] 25.1

Answer the following question.
Compare, giving reasons, the J-shaped and S-shaped models of population growth of a species.

Concept: Population Growth
Chapter: [5.01] Organisms and Populations
[2] 25.2

Answer the following question.
Explain ‘fitness of a species’’ as mentioned by Darwin.

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution
OR
[5] 25.3

Answer the following question.
What is an ecological pyramid? Compare the pyramids of energy, biomass, and numbers.

Concept: Ecological Pyramids
Chapter: [5.02] Ecosystem
[3] 25.4

Answer the following question.
Write any two limitations of ecological pyramids.

Concept: Ecological Pyramids
Chapter: [5.02] Ecosystem
[5] 26
[3] 26.1

Answer the following question.
Describe the structure and function of a t-RNA molecule. Why is it referred to as an adapter molecule?

Concept: Genetic Code - tRNA – the Adapter Molecule
Chapter: [2.02] Molecular Basis of Inheritance
[2] 26.2

Answer the following question.
Explain the process of splicing of hn-RNA in a eukaryotic cell.

Concept: Concept of RNA World
Chapter: [2.02] Molecular Basis of Inheritance
OR
[5] 26.3

Answer the following question.
Write the different components of a lac-operon in E. coli. Explain its expression while in an ’open’ state.

Concept: Ecosystem (Questions)
Chapter: [5.02] Ecosystem
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