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

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


Name the transcriptionally active region of chromatin in a nucleus.

Concept: The DNA - Packaging of Dna Helix
Chapter: [2.02] Molecular Basis of Inheritance

A geneticist interested in studying variations and patterns of inheritance in living beings prefers to choose organisms for experiments with shorter life cycle. Provide a reason.

Concept: Mendel’s Laws of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation

What is biopiracy?

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Application

State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks) during industrialization period in England.

Concept: Evidences for Evolution
Chapter: [2.03] Evolution

Indiscrimate diagnostic practices using X-rays etc., should be avoided. Give one reason.

Concept: AIDS
Chapter: [3.01] Human Health and Diseases

Differentiate between 'ZZ' and 'XY' type of sex-determination mechanisms.

Concept: Sex Determination in Humans
Chapter: [2.01] Principles of Inheritance and Variation

An infertile couple is advised to adopt test-tube baby programme. Describe two principle procedures adopted for such technologies.

Concept: Infertility
Chapter: [1.04] Reproductive Health
[2]8 | Attempt any one

Many fresh water animals can not survive in marine environment. Explain.

Concept: Organism and Its Environment - Introduction of Organisms and Environment
Chapter: [5.01] Organisms and Populations

How are productivity, gross productivity, net primary productivity and secondary productivity interrelated ?

Concept: Productivity
Chapter: [5.02] Ecosystem

Enumerate four objectives for improving the nutritional quality of different crops for the health benefits of the human population by the process of "Biofortification".

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production

Mention a product of human welfare obtained with the help of each one of the following microbes :
(a) LAB
(b) Saccharomyces cerevisiae
(c) Propionibacterium shermanii
(d) Aspergillus niger

Concept: Introduction of Microbes in Human Welfare
Chapter: [3.03] Microbes in Human Welfare
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Describe the process of Parturition in humans.

Concept: Parturition and Lactation
Chapter: [1.03] Human Reproduction

Describe the development of endosperm after double fertilisation in an angiosperm.

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

Why does endosperm development preceeds that of zygote ?

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

Explain the interpretation of Charles Darwin when he observed a variety of smallblack birds on Galapagos Islands.

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution

A teacher wants his/her students to find the genotype of pea plants bearing purple coloured flowers in their school garden. Name and explain the cross that will make it possible

Concept: Elementary Idea of Polygenic Inheritance
Chapter: [2.01] Principles of Inheritance and Variation

A DNA segment has a total of 2,000 nucleotides, out of which 520 are adenine containing nucleotides. How many purine bases this DNA segment possesses ?

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

Draw a diagrammatic sketch of a portion of DNA segment to support your answer.

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

Recombination DNA−technology is of great importance in the field of medicine. With the help of a flow chart, show how this technology has been used in preparing genetically engineered human insulins.

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

Draw a labelled sketch of sparged-stirred-tank bioreactor. Write its application.

Concept: Processes of Recombinant Dna Technology
Chapter: [4.01] Biotechnology - Principles and Processes

Following the collision of two trains a large number of passengers are killed. A majority of them are beyond recognition. Authorities want to hand over the dead to their relatives. Name a modern scientific method and write the procedure that would help in the identification of kinship.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance

A team of students are preparing to participate in the interschool sports meet. During a practice session you find some vials with labels of certain cannabinoids.

(a) Will you report to the authorities? Why?

(b) Name of a plant from which such chemicals are obtained.

(c) Write the effect of these chemicals on human body.

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
[3]20 | Attempt any one

Many plant and animal species are on the verge of their extinction because of loss of forest land by indiscriminate use by the humans. As a biology student what method would you suggest along with its advantages that can protect such threatened species from getting extinct ?

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

"Determination of Biological Oxygen Demand (BOD) can help in suggesting the quality of a water body." Explain.

Concept: Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
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Enlist the steps involved in inbreeding of cattle.

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

Suggest two disadvantages of inbreeding of cattle practice.

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

Choose any three microbes, from the following which are suited for organic farming which is in great demand these days for various reasons. Mention one application of each one chosen.

Mycorrhiza, Monascus, Anabaena, Rhizobium, Methanobacterium, Trichoderma.

Concept: Microbes in Human Welfare (Questions)
Chapter: [3.03] Microbes in Human Welfare

Since October 02, 2014 "Swachh Bharat Abhiyan" has been launched in our country.
(a) Write your views on this initiative giving justification.
(b) As a biologist name two problems that you may face while implementing the programme in your locality.
(c) Suggest two remedial methods to overcome these problems.

Concept: Environmental Issues (Question)
Chapter: [5.04] Environmental Issues
[5]24 | Attempt any one

Explain the genetic basis of blood grouping in human population.

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

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: [2.02] Molecular Basis of Inheritance
[5]25 | Attempt any one

"Analysis of age-pyramids for human population can provide important inputs for long-term planning strategies." Explain.

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

Describe the advantages for keeping the ecosystems healthy

Concept: Ecosystem (Questions)
Chapter: [5.02] Ecosystem
[5]26 | Attempt any one

A flower of tomato plant following the process of sexual reproduction produces 200 viable seeds.

Answer the following questions giving reasons :

(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?

(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?

(c) How many pollen grains must have minimally pollinated the carple ?

(d) How many male gametes would have used to produce these 200 viable seeds ?

(e) How many megaspore mother cells were required in this process ?


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

Explain the development of a secondary oocyte (ovum)  in a human female from the embryonic stage upto its ovulation. Name the hormones involved in this process.

Concept: Gametogenesis
Chapter: [1.03] Human Reproduction
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