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Biology Delhi Set 3 2015-2016 CBSE (Commerce) Class 12 Question Paper Solution

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

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] 2

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] 3

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] 4

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

Concept: Population and Ecological Adaptations
Chapter: [0.01] Organisms and Populations
[1] 5

Give an example of a codon having dual function.

Concept: Genetic Code - Introduction of Genetic Code
Chapter: [0.02] Molecular Basis of Inheritance
[2] 6

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] 7

Distinguish between the roles of flocs and anaerobic sludge digesters in sewage treatments.

Concept: Microbes in Sewage Treatment
Chapter: [0.03] Microbes in Human Welfare
[2] 8 | Attempt any one
[2] 8.1

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] 8.2

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] 9

Plants that inhabit a rain-forest are not found in a wetland. Explain.

Concept: Organism and Its Environment - Introduction of Organisms and Environment
Chapter: [0.01] Organisms and Populations
[2] 10

Angiosperms bearing unisexual flowers are said to be either monoecious or dioecious. Explain with the help of one example each.

Concept: Post Fertilization in Plant: Development of Endosperm
Chapter: [0.02] Sexual Reproduction in Flowering Plants
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[3] 11

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] 12

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] 13

Name any two fowls other than chicken reared in a poultry farm

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

Enlist four important components of poultry farm management.

Concept: Animal Husbandry (Livestock)
Chapter: [0.02] Strategies for Enhancement in Food Production
[3] 14

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] 15

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] 16

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] 17

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
[3] 18

Explain with the help of suitable examples the three different ways by which organisms overcome their stressful conditions lasting for short duration.

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [0.01] Organisms and Populations
[3] 19

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] 20

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] 21 | Attempt any one
[3] 21.1

"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
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[3] 21.2

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
[3] 22

How would you find genotype of a tall pea plant bearing white flowers? Explain with the help of a cross. Name the type of cross you would use.

Concept: Elementary Idea of Polygenic Inheritance
Chapter: [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

Answer the following questions based on Hershey and Chases's experiments:

(a) Name the kind of virus they worked with and why?

(b) Why did they use two types of culture media to grow viruses in ? Explain.

(c) What was the need for using a blender and later a centrifuge during their experiments?

(d) State the conclusion drawn by them after the experiments.

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [0.02] Molecular Basis of Inheritance
[5] 24.2

How did Darwin explain adaptive radiation ? Give another example exhibiting adaptive radiation.

Concept: Adaptive Radiation
Chapter: [0.03] Evolution

Name the scientist who influenced Darwin and how ?

Concept: Theories of Evolution: Darwinism or Theory of Natural Selection
Chapter: [0.03] Evolution
[5] 25 | Attempt any one
[5] 25.1

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] 25.2

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] 26 | Attempt any one
[5] 26.1

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] 26.2

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

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