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Biology Delhi Set 2 2015-2016 CBSE (Commerce) Class 12 Question Paper Solution

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Biology [Delhi Set 2]
Marks: 70 Academic Year: 2015-2016
Date & Time: 21st March 2016, 10:30 am
Duration: 3h
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[1] 1

Suggest a technique to a researcher who needs to separate fragments of DNA.

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [0.01] Biotechnology - Principles and Processes
[1] 2

State a difference between a gene and an allele.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [0.01] Principles of Inheritance and Variation
[1] 3

Give an example of a human disorder that is caused due to a single gene mutation.

Concept: Genetic Disorders
Chapter: [0.01] Principles of Inheritance and Variation [0.01] Principles of Inheritance and Variation
[1] 4

Suggest the breeding method most suitable for animals that are below average in milk  productivity.

Concept: Animal Husbandry (Livestock)
Chapter: [0.02] Strategies for Enhancement in Food Production
[1] 5

Excessive nutrients in a fresh water body cause fish mortality. Give two reasons.

Concept: Population and Ecological Adaptations
Chapter: [0.01] Organisms and Populations
[2] 6 | Attempt any one
[2] 6.1

Name the causative organism of the disease amoebiasis. List three symptoms of the disease.

Concept: Common Diseases in Humans
Chapter: [0.01] Human Health and Diseases
[2] 6.2

Identify 'A', 'B', 'C' and 'D' in the given table.
 

Crop Variety Resistance to disease
   A    Himgiri Leaf rust
Cauliflower Pusa Shubhra    B   
Brassica Pusa Swarnim    C   
Cowpea    D    Bacterial blight
Concept: Plant Breeding
Chapter: [0.02] Strategies for Enhancement in Food Production
[2] 7

Discuss the role the enzyme DNA ligase plays during DNA replication.

Concept: DNA Replication - The Experimental Proof
Chapter: [0.02] Molecular Basis of Inheritance
[2] 8

Explain the importance of syngamy and meiosis in a sexual life cycle of an organism.

Concept: Sexual Reproduction - Pre-fertilisation Events - Gametogenesis
Chapter: [0.01] Reproduction in Organisms
[2] 9

List the events that lead to biogas production from waste water whose BOD has been reduced significantly.

Concept: Introduction of Water Pollution and Its Control
Chapter: [0.04] Environmental Issues
[2] 10

Why the plants that inhabit a desert are not found in a mangrove? Give reasons.

Concept: Organism and Its Environment - Introduction of Organisms and Environment
Chapter: [0.01] Organisms and Populations
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[3] 11

Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life.

Concept: Origin of Life (Theories)
Chapter: [0.03] Evolution
[3] 12

Differentiate between somaclones and somatic hybrids. Give one example of each.

Concept: Tissue Culture
Chapter: [0.02] Strategies for Enhancement in Food Production
[3] 13

Why is breast-feeding recommended during the initial period of an infant's growth? Give reasons.

Concept: Human Health and Diseases (Questions)
Chapter: [0.01] Human Health and Diseases
[3] 14

Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro.

Concept: Processes of Recombinant Dna Technology
Chapter: [0.01] Biotechnology - Principles and Processes
[3] 15

What is a GMO?

Concept: Biotechnological Applications in Agriculture
Chapter: [0.02] Biotechnology and Its Application

List any five possible advantages of a GMO to a farmer.

Concept: Biotechnological Applications in Agriculture
Chapter: [0.02] Biotechnology and Its Application
[3] 16

Given below is a list of six micro-organisms. State their usefulness to humans.
(a) Nucleopolyhedrovirus
(b) Saccharomyces cerevisiae
(c) Monascus purpureus
(d) Trichoderma polysporum
(e) Penicillium notatum
(f) Propionibacterium sharmanii

Concept: Microbes as Biocontrol Agents
Chapter: [0.03] Microbes in Human Welfare
[3] 17

A couple with normal vision bear a colour blind child. Work out a cross to show how it is possible and mention the sex of the affected child.

Concept: Genetic Disorders
Chapter: [0.01] Principles of Inheritance and Variation [0.01] Principles of Inheritance and Variation
[3] 18

Prior to a sports event blood & urine samples of sports-persons are collected for drug tests.
(a) Why is there a need to conduct such tests?
(b) Name the drugs the authorities usually look for.
(c) Write the generic names of two plants from which these drugs are obtained. 

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [0.01] Human Health and Diseases
[3] 19

In certain seasons we sweat profusely while in some other season we shiver. Explain.

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [0.01] Organisms and Populations
[3] 20 | Attempt any one
[3] 20.1

"In a food-chain, a trophic level represents a functional level, not a species." Explain.

Concept: Energy Flow in an Ecosystem
Chapter: [0.02] Ecosystem
[3] 20.2

Name any two places where it is essential to install electrostatic precipitators. Why is it required to do so?

Concept: Prevention of Air Pollution
Chapter: [0.04] Environmental Issues

Mention one limitation of the electrostatic precipitator.

Concept: Prevention of Air Pollution
Chapter: [0.04] Environmental Issues
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[3] 21

How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognitia?

Concept: Biotechnological Applications in Agriculture
Chapter: [0.02] Biotechnology and Its Application
[3] 22

Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross.

Concept: Genetic Disorders
Chapter: [0.01] Principles of Inheritance and Variation [0.01] Principles of Inheritance and Variation
[4] 23

Reproductive and Child Healthcare (RCH) programmes are currently in operation. One of the major tasks of these programmes is to create awareness amongst people about the wide range of reproduction related aspects. As this is important and essential for building a reproductively healthy society.

(a) "Providing sex education in schools in one of the ways to meet this goal." Give four points in support of your opinion regarding this statement.

(b) List any two 'indicators' that indicate a reproductively healthy society.

Concept: Reproductive Health
Chapter: [0.04] Reproductive Health [0.04] Reproductive Health [0.04] Reproductive Health [0.04] Reproductive Health
[5] 24 | Attempt any one
[5] 24.1

Why should we conserve biodiversity ? How can we do it?

Concept: Conservation of Biodiversity
Chapter: [0.03] Biodiversity and Its Conservation

Explain the importance of biodiversity hot-spots and sacred groves.

Concept: Importance of Biodiversity
Chapter: [0.03] Biodiversity and Its Conservation
[5] 24.2

Represent diagrammatically three kinds of age-pyramids for human populations.

Concept: Population - Population Attributes
Chapter: [0.01] Organisms and Populations

How does an age pyramid for human population at given point of time helps the policy-makers in planning for future.

Concept: Population - Population Attributes
Chapter: [0.01] Organisms and Populations
[5] 25 | Attempt any one
[5] 25.1

Explain the post-pollination events leading to seed production in angiosperms.

Concept: Pre-fertilization in Plant: Pollination
Chapter: [0.02] Sexual Reproduction in Flowering Plants

List the different types of pollination depending upon the source of pollen gain.

Concept: Pre-fertilization in Plant: Pollination
Chapter: [0.02] Sexual Reproduction in Flowering Plants
[5] 25.2

Briefly explain the events of fertilisation and implantation in an adult human female.

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

Comment on the role of placenta as an endocrine gland.

Concept: Pregnancy and Embryonic Development
Chapter: [0.03] Human Reproduction
[5] 26 | Attempt any one
[5] 26.1

List the criteria a molecule that can act as genetic material must fulfill. Which one of the criteria are best fulfilled by DNA or by RNA thus making one of them a better genetic material than the other? Explain.

Concept: Search for Genetic Material - Properties of Genetic Material (DNA Versus RNA)
Chapter: [0.02] Molecular Basis of Inheritance
[5] 26.2

Differentiate between analogy and homology giving one example each of plant and animal respectively.

Concept: Evidence of Organic Evolution
Chapter: [0.03] Evolution

How analogy and homology considered as an evidence in support of evolution ?

Concept: Evidence of Organic Evolution
Chapter: [0.03] Evolution

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