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Biology Foreign Set 3 2014-2015 CBSE (Arts) Class 12 Question Paper Solution

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Biology [Foreign Set 3]
Marks: 70 Academic Year: 2014-2015
Date: March 2015
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[1] 1

How does a degenerate code differ from an unambiguous one?

Concept: Genetic Code - tRNA – the Adapter Molecule
Chapter: [0.02] Molecular Basis of Inheritance
[1] 2

Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.

Concept: Types of Reproduction - Sexual Reproduction
Chapter: [0.01] Reproduction in Organisms
[1] 3

"Man can be a primary as well as a secondary consumer." Justify this statement.

Concept: Strategies for Enhancement in Food Production (Questions)
Chapter: [0.02] Strategies for Enhancement in Food Production
[1] 4

Write the hypothetical proposals put forth by Oparin and Haldane.

Concept: Reproduction in Organisms
Chapter: [0.01] Reproduction in Organisms
[1] 5

Write the function of RNA polymerase II.

Concept: The RNA World
Chapter: [0.02] Molecular Basis of Inheritance
[2] 6

Suggest two advantages to a farmer for using apomictic seeds of hybrid varieties.

Concept: Strategies for Enhancement in Food Production (Questions)
Chapter: [0.02] Strategies for Enhancement in Food Production
[2] 7

Why did T. H. Morgan select Drosophila melanogaster to study sex linked genes for his lab experiments ?

Concept: Sex Determination
Chapter: [0.01] Principles of Inheritance and Variation
[2] 8

What is joint forest management ? How can it help in conservation of forests ?

Concept: Environmental Issues
Chapter: [0.04] Environmental Issues [0.04] Environmental Issues
[2] 9 | Attempt one of the following
[2] 9.1

Differentiate between outbreeding and outcrossing.

Concept: Double Fertilization and Triple Fusion in Plant
Chapter: [0.02] Sexual Reproduction in Flowering Plants
[2] 9.2

Bottled fruit juices are clearer as compared to those made at home. Explain.

 

 
Concept: Introduction of Strategies for Enhancement in Food Production
Chapter: [0.02] Strategies for Enhancement in Food Production
[2] 10

How does a desert plant adapt to the dry, warmer environmental conditions ?

Concept: Environmental Issues
Chapter: [0.04] Environmental Issues [0.04] Environmental Issues
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[3] 11

What is amniocentesis and why there is a statutory ban on it?

Concept: Reproductive Health
Chapter: [0.04] Reproductive Health
[3] 12

Draw a diagrammatic, labelled sketch of a sectional view of human ovary.

 
Concept: Events in Sexual Reproduction in Organisms - Pre-fertilisation Events in Organisms
Chapter: [0.01] Reproduction in Organisms
[3] 13

Explain divergent evolution with two examples. 

Concept: Evolution of Life Forms - a Theory
Chapter: [0.03] Evolution
[3] 14

Name the kind of diseases/disorders that are likely to occur in humans if
    (i) mutation in the gene that codes for an enzyme phenyl alanine hydrolase occurs,
    (ii) there is an extra copy of chromosome 21,
    (iii) the karyotype is XXY.

Concept: Reproductive Health
Chapter: [0.04] Reproductive Health

Mention any one symptom of the diseases/disorders named above.

 

 
Concept: Reproductive Health
Chapter: [0.04] Reproductive Health
[3] 15

How was a heavy isotope of nitrogen used to provide experimental evidence to semi-conservative mode of DNA-replication ?

Concept: DNA Replication - The Experimental Proof
Chapter: [0.02] Molecular Basis of Inheritance
[3] 16

One of the major contributions of biotechnology is to develop pest-resistant varieties of cotton plants. Explain how it has been made possible.

 

 
Concept: Process and Principles of Biotechnology
Chapter: [0.01] Biotechnology - Principles and Processes [0.01] Biotechnology - Principles and Processes
[3] 17

State any two differences between phosphorus and carbon cycles in nature.

Concept: Nutrient Cycling
Chapter: [0.02] Ecosystem

Write the importance of phosphorus in living organisms.

 

 
Concept: Nutrient Cycling
Chapter: [0.02] Ecosystem
[3] 18

Construct a pyramid of numbers by taking suitable examples for each trophic level in an ecosystem.

Concept: Energy Flow in an Ecosystem
Chapter: [0.02] Ecosystem

Explain why a progressive decline is seen in the population size from the first to the fourth trophic level in the above pyramid.

 

 
Concept: Energy Flow in an Ecosystem
Chapter: [0.02] Ecosystem
[3] 19

How can sewage be used to generate biogas ? Explain.

Concept: Microbes in Human Welfare
Chapter: [0.03] Microbes in Human Welfare [0.03] Microbes in Human Welfare
[3] 20

Compare narrowly utilitarian and broadly utilitarian approaches to conserve biodiversity, with the help of suitable examples.

Concept: Biodiversity and Its Conservation (Questions)
Chapter: [0.03] Biodiversity and Its Conservation
[3] 21

Many copies of a specific gene of interest are required to study the detailed sequencing of bases in it. Name and explain the process that can help in developing large number of copies of this gene of interest.

 

 
Concept: Search for Genetic Material - The Genetic Material is a DNA
Chapter: [0.02] Molecular Basis of Inheritance
[3] 22 | Attempt one of the following
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[3] 22.1

Prepare a flow chart in formation of recombinant DNA by the action of restriction endonuclease enzyme EcoRI.

Concept: Processes of Recombinant DNA Technology
Chapter: [0.01] Biotechnology - Principles and Processes
[3] 22.2

Name and explain the technique used for separating DNA fragments and making them available for biotechnology experiments.

Concept: Process and Principles of Biotechnology
Chapter: [0.01] Biotechnology - Principles and Processes [0.01] Biotechnology - Principles and Processes
[4] 23

You have attended a birthday party hosted by one of your classmates. You found some guests at the party sitting in a corner making a lot of noise and consuming 'something'. After a while one of the boys from the group started screaming, behaving abnormally and sweating profusely. On enquiry you found that the group members were taking drugs.

(a) Would you inform your parents/school authorities ? Yes/No. Give reasons in support of your answer.

(b) Prepare a note to be circulated amongst the schoolmates about the sources and dangers of any two drugs.

(c) Write any two ways that you will suggest to your school principal so as to promote awareness amongst the youth against the use of these drugs.

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [0.01] Human Health and Diseases
[5] 24 | Attempt one of the following
[5] 24.1

(a) State and explain the law of dominance as proposed by Mendel.
(b) How would phenotypes of monohybrid F1 and F2 progeny showing incomplete dominance in Snapdragon and co-dominance in human blood group be different from Mendelian monohybrid F1 and F2 progeny? Explain.

Concept: Mendelian Inheritance - Mendel’s Laws of Heredity
Chapter: [0.01] Principles of Inheritance and Variation
[5] 24.2

Explain the process of transcription in Eukaryotes.

 
Concept: Protein synthesis - Transcription - Types of RNA and the Process of Transcription
Chapter: [0.02] Molecular Basis of Inheritance
[5] 25 | Attempt one of the following
[5] 25.1

Under polio prevention programme, infants in India were given polio vaccines on a large scale at regular intervals to eradicate polio from the country.

(a) What is a vaccine? Explain how does it impart immunity to the child against the disease.
(b) With the help of an example each, differentiate between active and passive immunity.

Concept: Drugs and Alcohol Abuse - Prevention and Control of Drugs and Alcohol Abuse
Chapter: [0.01] Human Health and Diseases
[5] 25.2

What are biofertilizers? Describe their role in agriculture. Why are they preferred to chemical fertilizers?

 

 
Concept: Biotechnological Applications in Agriculture
Chapter: [0.02] Biotechnology and Its Application
[5] 26 | Attempt one of the following
[5] 26.1

(a) Explain the events after pollination leading to the formation of a seed in angiosperms.
(b) Mention the ploidy levels of the cells of different parts of an albuminous seed.

Concept: Double Fertilization and Triple Fusion in Plant
Chapter: [0.02] Sexual Reproduction in Flowering Plants
[5] 26.2

Explain the process of fertilisation and implantation in humans.

Concept: Fertilization and Implantation
Chapter: [0.03] Human Reproduction

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