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Biology All India Set 3 2013-2014 CBSE (Commerce) Class 12 Question Paper Solution

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Biology
All India Set 3
2013-2014 March
Marks: 70

[1]1

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]2

Name the stage of cell division where segregation of an independent pair of chromosomes occurs.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[1]3

Write an alternate source of protein for animal and human nutrition.

Concept: Single Cell Protein (SCP)
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]4

Give an example of a plant which came into India as a contaminant and is a cause of pollen allergy.

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]5

Name the type of association that the genus Glomus exhibits with higher plants.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[1]6

State Gause’s Competitive Exclusion Principle.

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[1]7

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]8

State the role of C peptide in human insulin.

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Application
[2]9 | Attempt Any One
[2]9.1

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]9.2

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]10

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]11

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
[2]12

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

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
[2]13

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]14

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]15

How does a restriction nuclease function? Explain

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[2]16

Explain the two factors responsible for conferring stability to double helix structure of DNA.

Concept: Structure of DNA and RNA
Chapter: [2.02] Molecular Basis of Inheritance
[2]17

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]18

Write the effect of the high concentration of L.H. on a mature Graafian follicle

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]19

State the function of a reservoir in a nutrient cycle

Concept: Nutrient Cycling
Chapter: [5.02] Ecosystem

Explain the carbon cycle with the help of a simplified model.

Concept: Nutrient Cycling
Chapter: [5.02] Ecosystem
[3]20

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]21

The following graph shows the species - area relationship. Answer the following questions as directed.

(a) Name the naturalist who studied the kind of relationship shown in the graph. Write the observations made by him.

(b) Write the situations as discovered by the ecologists when the value of 'Z'
(Slope of the line) lies between.

(i) 0.1 and 0.2

(ii) 0.6 and 1.2

What does 'Z' stand for?

(c) When would the slope of the line 'b' become steeper?

Concept: Biodiversity - Patterns of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
[3]22

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
[3]23

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]24

Explain adaptive radiation with the help of a suitable example.

Concept: Adaptive Radiation
Chapter: [2.03] Evolution

Cite an example where more than one adaptive radiations have occurred in an isolated geographical area. Name the type of evolution your example depicts and state why it is so named.

Concept: Adaptive Radiation
Chapter: [2.03] Evolution
[3]25

Name any two copper releasing IUDs.

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

Explain how they act as effective contraceptives in human females.

Concept: Population Explosion and Birth Control
Chapter: [1.04] Reproductive Health
[3]26 | Attempt Any One
[3]26.1

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]26.2

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]27

State how the constant internal environment is beneficial to organisms.

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

Explain any two alternatives by which organisms can overcome stressful external conditions.

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [5.01] Organisms and Populations
[5]28 | Attempt Any One
[5]28.1

Explain the process of sewage water treatment before it can be discharged into natural water bodies. Why is this treatment essential?

Concept: Microbes in Sewage Treatment
Chapter: [3.03] Microbes in Human Welfare
[5]28.2

Explain the process of replication of a retrovirus after it gains entry into the human body.

Concept: AIDS
Chapter: [3.01] Human Health and Diseases
[5]29 | Attempt Any One
[5]29.1

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]29.2

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
[5]30 | Attempt Any One
[5]30.1

Describe the various steps of Griffith’s experiment that led to the conclusion of the 'Transforming Principle'.

Concept: Search for Genetic Material - Properties of Genetic Material (DNA Versus RNA)
Chapter: [2.02] Molecular Basis of Inheritance

How did the chemical nature of the ‘Transforming Principle' get established?

Concept: Search for Genetic Material - Properties of Genetic Material (DNA Versus RNA)
Chapter: [2.02] Molecular Basis of Inheritance
[5]30.2

Describe how the lac operon operates, both in the presence and absence of an inducer in E.coli.

Concept: Regulation of Gene Expression - The Lac Operon
Chapter: [2.02] Molecular Basis of Inheritance

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