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Biology All India Set 2 2013-2014 CBSE (Arts) Class 12 Question Paper Solution

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Biology
All India Set 2
2013-2014 March
Marks: 70

[1]1

Why is Gambusia introduced into drains and ponds?

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[1]2

State Gause’s Competitive Exclusion Principle.

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[1]3

Name the enzymes that are used for the isolation of DNA from bacterial and fungal cells for recombinant DNA technology.

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[1]4

State the role of C peptide in human insulin.

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Application
[1]5

Why is it not possible for an alien DNA to become part of a chromosome anywhere along its length and replicate normally?

Concept: Replication - The Experimental Proof
Chapter: [2.02] Molecular Basis of Inheritance
[1]6

Why is secondary immune response more intense than the primary immune response in humans?

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[1]7

Why are analogous structures a result of convergent evolution?

Concept: Adaptive Radiation
Chapter: [2.03] Evolution
[1]8

Name the vegetative propagules in the following :

Agave

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms

Name the vegetative propagules in the following

Bryophyllum

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[2]9

List the symptoms of Ascariasis. How does a healthy person acquire this infection?

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[2]10 | Attempt Any One
[2]10.1

Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-flies for his experiments? State any three reasons.

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[2]10.2

Linkage and crossing-over of genes are alternatives of each other. Justify with the help of an example.

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [2.01] Principles of Inheritance and Variation
[2]11

State the difference between the structural genes in a Transcription Unit of Prokaryotes and Eukaryotes.

Concept: Transcription - Transcription Unit and the Gene
Chapter: [2.02] Molecular Basis of Inheritance
[2]12

In Snapdragon, a cross between true-breeding red flowered (RR) plants and truebreeding white flowered (rr) plants showed a progeny of plants with all pink flowers.

The appearance of pink flowers is not known as blending. Why?

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation

In Snapdragon, a cross between true-breeding red flowered (RR) plants and truebreeding white flowered (rr) plants showed a progeny of plants with all pink flowers.

What is this phenomenon known as?

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[2]13

Write the location and function of the sertoli cells in humans.

Concept: Microscopic Anatomy of Testis
Chapter: [1.03] Human Reproduction

Write the location and functions of the following in human testes :

Leydig cells

 

Concept: Microscopic Anatomy of Testis
Chapter: [1.03] Human Reproduction
[2]14

Construct an age pyramid which reflects an expanding growth status of human population.

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
[2]15

Describe the mutual relationship between fig tree and wasp and comment on the phenomenon that operates in their relationship.

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[2]16

How have transgenic animals proved to be beneficial in: Production of biological products

Concept: Transgenic Animals
Chapter: [4.02] Biotechnology and Its Application

How have transgenic animals proved to be beneficial in: Chemical safety testing

Concept: Transgenic Animals
Chapter: [4.02] Biotechnology and Its Application
[2]17

How does a restriction nuclease function? Explain

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[2]18

Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[3]19

Identify 'a', 'b', 'c',’d’, 'e' and 'f' in the table given below:

No. Syndrome Cause Characteristics of  affected individuals Sex
Male/Female/Both
1. Down's Trisomy of 21 'a' (i)
(ii)
'b'
2. 'c' XXY Overall masculine
development.
'd'
3. Turner's 45 with XO 'e' (i)
(ii)
'f'
Concept: Genetic Disorders - Chromosomal Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[3]20

Why is pedigree analysis done in the study of human genetics? State the conclusions that can be drawn from it.

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[3]21

A woman has certain queries as listed below, before starting with contraceptive pills. Answer them

What do contraceptive pills contain and how do they act as contraceptives?

Concept: Population Explosion and Birth Control
Chapter: [1.04] Reproductive Health

A woman has certain queries as listed below, before starting with contraceptive pills. Answer them.

What schedule should be followed for taking these pills?

Concept: Population Explosion and Birth Control
Chapter: [1.04] Reproductive Health
[3]22 | Attempt Any One
[3]22.1

Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]22.2

Why angiosperm anthers are called dithecous?

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

Describe the structure of its microsporangium.

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]23

Since the origin of life on Earth, there were five episodes of mass extinction of species.

How is the ‘Sixth Extinction’, presently in progress, different from the previous episodes?

 

Concept: Extinction
Chapter: [5.03] Biodiversity and Its Conservation

Since the origin of life on Earth, there were five episodes of mass extinction of species.

Who is mainly responsible for the 'Sixth Extinction’?

Concept: Extinction
Chapter: [5.03] Biodiversity and Its Conservation

Since the origin of life on Earth, there were five episodes of mass extinction of species List any four points that can help to overcome this disaster.

 

Concept: Extinction
Chapter: [5.03] Biodiversity and Its Conservation
[3]24

Two types of aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilisers.

Answer the questions based on the facts given above:

(i) Name the organisms depicting the patterns A and B.

(ii) State the reason for the growth pattern seen in A.

(iii) Write the effects of the growth patterns seen above.

 

Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[3]25

Name and describe the technique that helps in separating the DNA fragments formed by the use of restriction endonuclease

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[3]26

Explain, giving three reasons, why tropics show greatest levels of species diversity.

Concept: Biodiversity - Patterns of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
[3]27

Community Service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene.

(a) Why is there a need to organize such visits?

(b) Write the steps you will highlight, as a member of this department, in your interaction with them to enable them to lead a healthy life.

Concept: Infectious and Non Infectious Disease
Chapter: [3.01] Human Health and Diseases
[5]28 | Attempt Any One
[5]28.1

Describe the Hershey and Chase experiment. Write the conclusion drawn by the scientists after their experiment.

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [2.02] Molecular Basis of Inheritance
[5]28.2

Work out a typical Mendelian dihybrid cross and state the law that he derived from it.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[5]29 | Attempt Any One
[5]29.1

With advancements in genetics, molecular biology and tissue culture, new traits have been incorporated into crop plants. Explain the main steps in breeding a new genetic variety of a crop

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[5]29.2

State the objective of animal breeding.

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

List the importance of inbreeding.

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

State the disadvantage of inbreeding among cattle. How it can be overcome?

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

Give an example of a new breed each of cattle and poultry.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[5]30 | Attempt Any One
[5]30.1

Where does fertilization occur in humans? Explain the events that occur during this process.

Concept: Fertilisation and Implantation
Chapter: [1.03] Human Reproduction

A couple where both husband and wife are producing functional gametes, but the wife is still unable to conceive, is seeking medical aid. Describe any one method that you can suggest to this couple to become happy parents

Concept: Embryo Development Upto Blastocyst Formation
Chapter: [1.03] Human Reproduction
[5]30.2

Explain the different ways apomictic seeds can develop, Give an example of each.

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

Mention one advantage of apomictic seeds to farmers.

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

Draw a labelled mature stage of a dicotyledonous embryo.

Concept: Post-fertilisation : Structures and Events - Endosperm
Chapter: [1.02] Sexual Reproduction in Flowering Plants

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