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Biology (Theory) Set 1 2018-2019 ISC (Arts) Class 12 Question Paper Solution

Biology (Theory) [Set 1]
Marks: 70Academic Year: 2018-2019
Date: March 2019

Part I consists of one question of 20 marks having five subparts.

Part II consists of Sections A, B, and C.

Section A consists of Seven questions of two marks each.

Section B consists of seven questions of three marks each and

Section C consists of three questions of five marks each.


Part-1
[20]1
[1]1.a
[1]1.a.i

Answer the following question:

Name the antibody which is most effective in allergies.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[1]1.a.ii

Answer the following question:

What is the function of GEAC?

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Applications
[1]1.a.iii

Answer the following question:

What is a clone?

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]1.a.iv

Answer the following question:

What do detritus food chains begin with?

Concept: Energy Flow
Chapter: [5.02] Ecosystem
[1]1.a.v

Answer the following question:

Give the full form of EFB.

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Applications
[1]1.a.vi

Answer the following question:

How many chromosomes are present in meiocytes of a fruit fly?

Concept: Sex Determination in Birds
Chapter: [2.01] Principles of Inheritance and Variation
[1]1.a.vii

Answer the following question:

Name the common ancestor of apes and man.

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution
[1]1.a.viii

Answer the following question:

Give the scientific term used for the preservation of germplasm at a very low temperature.

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[4]1.b
[1]1.b.i

Choose the correct options of the following question:

Eyelids in human foetus separate in :

14 weeks

16 weeks

24 weeks

40 weeks

Concept: Pregnancy and Embryonic Development
Chapter: [1.03] Human Reproduction
[1]1.b.ii

Choose the correct options of the following question:

Study the given monohybrid cross:

A test cross for this Fj will be:

 Tt × TT

Tt × tt

Tt × Tt

TT × tt

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[1]1.b.iii

Choose the correct options of the following question:

Montreal Protocol aims at:

Reduction of ozone-depleting substances

Biodiversity conservation’

Control of water pollution

Control of CO2 emission.

Concept: Ozone - Ozone Depletion in the Stratosphere
Chapter: [5.04] Environmental Issues
[1]1.b.iv

Choose the correct options of the following question:

In the given pedigree chart, the trait shown is:

Autosomal dominant

Autosomal recessive

X-linked

Y-linked

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[4]1.c
[1]1.c.i

Give one significant contribution to the following scientists:

Wallace

Concept: Biological Evolution
Chapter: [2.03] Evolution
[1]1.c.ii

Give one significant contribution to the following scientists:

R. Mishra

Concept: Ecology (Organism, Population, Community and Biome)
Chapter: [5.01] Organisms and Populations
[1]1.c.iii

Give one significant contribution to the following scientists:

G. Gamow

Concept: Regulation of Gene Expression - The Lac Operon
Chapter: [2.02] Molecular Basis of Inheritance
[1]1.c.iv

Give one significant contribution to the following scientists:

Sanger

Concept: Human Genome Project
Chapter: [2.02] Molecular Basis of Inheritance
[2]1.d
[1]1.d.i

Define the Carrying capacity.

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
[1]1.d.ii

Define the Homologous chromosomes

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[2]1.e
[1]1.e.i

Give a reason for the following: 

Bagging is essential in artificial hybridization.

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
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[1]1.e.ii

Give a reason for each the following: 

Climax stage is achieved quickly in secondary succession as compared to primary succession.

Concept: Ecological Succession
Chapter: [5.02] Ecosystem
Part-II Section-A
[2]2

Enumerate any four essential features of good and effective poultry farm management practices.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]3

What is a single cell protein? How is it significant for human welfare?

Concept: Single Cell Protein (SCP)
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]4
[2]4.a

List four reasons for drug addiction.

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
OR
[2]4.b

List four effects of alcoholism on human health.

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
[2]5

State four features of flowers pollinated by insects.

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]6

What is reproductive fitness? Explain it with the help of an example. 

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
[2]7

Give one significant difference between primary lymphoid organs and secondary lymphoid organs. Give one example of each.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[2]8
[2]8.a

Explain the term biofortification. How is this technique useful for the production of ‘ golden rice? 

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Applications
OR
[2]8.b

Write a short note on Electrophoresis.

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
Section-B
[3]9

Explain the evolution of the long neck of giraffe according to Charles Darwin. 

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution
[3]10
[3]10.a

Draw a labelled diagram of the T.S. of a mature anther. 

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants
OR
[3]10.b

Draw a diagram of the internal structure of the human ovary.

Concept: Microscopic Anatomy of Ovary
Chapter: [1.03] Human Reproduction
[3]11

Describe the structure of a nucleosome.

Concept: The DNA - Packaging of Dna Helix
Chapter: [2.02] Molecular Basis of Inheritance
[3]12
[3]12.a

Explain the Rivet Popper hypothesis.

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
OR
[3]12.b
[1]12.b.i

 Define the Standing crop

Concept: Ecosystem Services
Chapter: [5.02] Ecosystem
[1]12.b.ii

Define the Stenothermal organisms

Concept: Organism and Its Environment - Introduction of Organisms and Environment
Chapter: [5.01] Organisms and Populations
[1]12.b.iii

Define the Niche

Concept: Introduction of Organisms and Populations
Chapter: [5.01] Organisms and Populations
[3]13
[0.5]13.a

Give the biological name of the following:

The mould from which penicillin is obtained.

Concept: Microbes in Industrial Production
Chapter: [3.03] Microbes in Human Welfare
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[0.5]13.b

Give the biological name of the following: 

Baker’s yeast

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[0.5]13.c

Give the biological name of the following:

The microbe used to control insect larvae growing on cotton.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[0.5]13.d

Give the biological name of the following: 

The microbe used to produce Swiss cheese.

Concept: Microbes in Household Products
Chapter: [3.03] Microbes in Human Welfare
[0.5]13.e

Give the biological name of the following: 

The fungus that is being developed as a bio-control agent.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[0.5]13.f

Give the biological name of the following: 

A symbiotic nitrogen-fixing bacterium found in root nodules.

Concept: Microbes in Household Products
Chapter: [3.03] Microbes in Human Welfare
[3]14

Explain the different types of endosperms in angiosperms. 

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]15

A homozygous pea plant with round seed coat and yellow cotyledons are crossed with another homozygous, pea plant having wrinkled seed coat and green cotyledons.
(i) Give the types of gametes produced by plants of F-generation.

(ii) Give the dihybrid phenotypic ratio with the corresponding phenotypes.

(iii) State Mendel’s principle involved in this cross.

Concept: Heredity and Variation
Chapter: [2.01] Principles of Inheritance and Variation
Section-C
[5]16
[5]16.a

Describe the physicochemical events that take place during fertilization in humans.

Concept: Fertilisation and Implantation
Chapter: [1.03] Human Reproduction
OR
[5]16.b
[1]16.b.i

Define and give the role of amniocentesis.

Concept: Reproductive Health - Problems and Strategies
Chapter: [1.04] Reproductive Health
[1]16.b.ii

Name the causative agent and give anyone a symptom of Gonorrhoea.

Concept: Sexually Transmitted Diseases (STDs)
Chapter: [1.04] Reproductive Health
[1]16.b.iii

What is the significance of the dispersal of seeds? Give any two points.

Concept: Double Fertilisation
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]16.b.iv

What are seasonal breeders? Give an example.

Concept: Introduction of Sexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[1]16.b.v

How is the chromosome number maintained in sexually reproducing organisms?

Concept: Introduction of Sexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[5]17
[5]17.a
[2.5]17.a.i

What are the restriction endonucleases? Give the rules of their nomenclature.

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[2.5]17.a.ii

Explain the mechanism of action of restriction endonucleases that makes them suitable for genetic engineering.

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
OR
[5]17.b
[2.5]17.b.i

Explain what are the desirable characteristics of an ideal cloning vector used in rDNA technology.

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[2.5]17.b.ii

Describe two vectors less methods of gene transfer used in rDNA technology.

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[5]18
[5]18.a

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

Concept: Nutrient Cycling
Chapter: [5.02] Ecosystem
OR
[5]18.b

Give a graphic representation of the phosphorus cycle in nature.

Concept: Nutrient Cycling
Chapter: [5.02] Ecosystem
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CISCE previous year question papers Class 12 Biology (Theory) with solutions 2018 - 2019

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