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Biology Delhi Set 2 2016-2017 CBSE (Arts) Class 12 Question Paper Solution

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Biology [Delhi Set 2]
Marks: 70Academic Year: 2016-2017
Date & Time: 4th April 2017, 12:30 pm
Duration: 3h

[1]1

What is "fitness of an individual" according to Darwin?

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution
[1]2

What is biopiracy?

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Application
[1]3

Suggest a method to ensure an anamnestic response in humans.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[1]4

State the fate of a pair of autosomes during gamete formation.

Concept: Sexual Reproduction - Pre-fertilisation Events - Gametogenesis
Chapter: [1.01] Reproduction in Organisms
[1]5

Our government has intentionally imposed strict conditions for M.T.P. in our country. Justify giving a reason.

Concept: Reproductive Health - Problems and Strategies
Chapter: [1.04] Reproductive Health [1.04] Reproductive Health
[2]6

By taking two examples explain how has bio-fortification helped in improving food quality.

Concept: Introduction of Strategies for Enhancement in Food Production
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]7

Plenty of algal bloom is observed in a pond in your locality.

(a) Write what has caused this bloom and how does it affect the quality of water.
(b) Suggest a preventive measure.

Concept: Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[2]8

How does the application of cyanobacteria help improve agricultural output?

Concept: Microbes as Biofertilisers
Chapter: [3.03] Microbes in Human Welfare
[2]9

In a flowering plant a microspore mother cell produces four male gametophytes while a megapore mother cell forms only one female gametophyte. Explain

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]10 | Attempt any one
[2]10.1

Describe the structure of a nucleosome.

Concept: The DNA - Packaging of Dna Helix
Chapter: [2.02] Molecular Basis of Inheritance
[2]10.2

Mention the evolutionary significance of the Shrews

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution

Mention the evolutionary significance of the Lobefins

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution

Mention the evolutionary significance of the Homo habilis

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution

Mention the evolutionary significance of the Homo erectus

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution
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[3]11

During a medical investigation, an infant was found to possess an extra  chromosome-21. Describe the symptoms the child is likely to develop later in the life.

Concept: Genetic Disorders - Chromosomal Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[3]12 | Attempt any one
[3]12.1

'in-situ' Conservation can help endangered/threatened species. Justify the statement.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[3]12.2

Name and describe any three causes of bio-diversity losses.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[3]13

Difference between an annual and biennial plants. Provide one example of each.

Concept: Introduction of Sexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[3]14

Describe the structure of a seminiferous tubule.

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction
[3]15

A number of passengers were severely burnt beyond recognition during a train accident. Name and describe a modern technique that can help hand over the dead to their relatives.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance
[3]16

p2 + 2pq + q2 = 1. Explain this algebraic equation on the basis of Hardy Weinberg's principle.

Concept: Hardy - Weinberg'S Principle
Chapter: [2.03] Evolution
[3]17

Explain the role of Restriction endonuclease in Biotechnology

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application

Explain the role of the Gel − electrophoresis in Biotechnology

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application

Explain the role of the Selectable markers in pBR322 in Biotechnology.

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
[3]18

Why do lepidopterans die when they feed on Bt cotton plant? Explain how does it happen.

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[3]19

Write the steps you would suggest to be undertaken to obtain a foreign-gene-product.

Concept: Tools of Recombinant Dna Technology - Competent Host (For Transformation with Recombinant Dna)
Chapter: [4.01] Biotechnology - Principles and Processes
[3]20

Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.

Concept: Microbes in Sewage Treatment
Chapter: [3.03] Microbes in Human Welfare
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[3]21

Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.

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

Explain the importance of "selection" during inbreeding in cattle

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]22

A group of youth were having a 'rave party' in an isolated area and was raided by police. Packets of 'smack' and syringes with needles were found littered around.

(a) Why is taking 'smack' considered an abuse?

(b) Write the chemical name of 'smack' and the name of its source plant.

(c) Syringes and needles used by the youth for taking the drug could prove to be very fatal. Why?

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
[4]23

Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident's Welfare Association of your locality organized an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate.

(a) How would you justify your arguments that promote burying and discourage burning? (Give two reasons)

(b) With the help of flow charts, one for each practice depict the chain of events that follow.

Concept: Water Pollution and Its Control - Domestic Sewage and Industrial Effluents
Chapter: [5.04] Environmental Issues
[5]24 | Attempt any one
[5]24.1

What is an age-pyramid?

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

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

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
[5]24.2

Discuss the role of healthy ecosystem services as a pre-requisite for a wide range of economic, environmental and aesthetic goods and services

Concept: Ecosystem Services
Chapter: [5.02] Ecosystem
[5]25 | Attempt any one
[5]25.1

Read the statement and answer the questions that follow.

A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.

(a) What could have prevented the rest of the 40 ovules from maturing into viable seeds? Explain giving a reason.

(b) Describe the development of a dicot embryo in a viable seed.

(c) Why certain angiospermic seed albuminous while others are exalbuminous? Explain.

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[5]25.2

Name the hormones secreted and write their functions by corpus luteum and placenta (any two).

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

Name the hormones secreted and write their functions : during Follicular phase and parturition.

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

Name the stages in a human female where Corpus luteum and placenta co-exist.

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

Name the stages in a human female where : Corpus luteum temporarily ceases to exist.

Concept: Fertilisation and Implantation
Chapter: [1.03] Human Reproduction
[5]26 | Attempt any one
[5]26.1

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]26.2

How do the observations made during moth collection in pre- and post- industrialized era in England support evolution by Natural Selection?

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

Explain the phenomenon that is well represented by Darwin's finches other than natural selection.

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