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

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Biology (Theory) [Set 1]
Marks: 70 CISCE
ISC (Commerce)
ISC (Arts)
ISC (Science)

Academic Year: 2018-2019
Date: March 2019
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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: undefined - undefined
Chapter: [0.031] Human Health and Diseases
[1]1.a.ii

Answer the following question:

What is the function of GEAC?

Concept: undefined - undefined
Chapter: [0.042] Biotechnology and Its Applications
[1]1.a.iii

Answer the following question:

What is a clone?

Concept: undefined - undefined
Chapter: [0.032] Strategies for Enhancement in Food Production
[1]1.a.iv

Answer the following question:

What do detritus food chains begin with?

Concept: undefined - undefined
Chapter: [0.052000000000000005] Ecosystem
[1]1.a.v

Answer the following question:

Give the full form of EFB.

Concept: undefined - undefined
Chapter: [0.042] Biotechnology and Its Applications
[1]1.a.vi

Answer the following question:

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

Concept: undefined - undefined
Chapter: [0.021] Principles of Inheritance and Variation
[1]1.a.vii

Answer the following question:

Name the common ancestor of apes and man.

Concept: undefined - undefined
Chapter: [0.023] 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: undefined - undefined
Chapter: [0.032] 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: undefined - undefined
Chapter: [0.013000000000000001] 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: undefined - undefined
Chapter: [0.021] 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: undefined - undefined
Chapter: [0.054000000000000006] 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: undefined - undefined
Chapter: [0.021] Principles of Inheritance and Variation
[4]1.c
[1]1.c.i

Give one significant contribution to the following scientists:

Wallace

Concept: undefined - undefined
Chapter: [0.023] Evolution
[1]1.c.ii

Give one significant contribution to the following scientists:

Prof. R. Mishra

Concept: undefined - undefined
Chapter: [0.051] Organisms and Populations
[1]1.c.iii

Give one significant contribution to the following scientists:

G. Gamow

Concept: undefined - undefined
Chapter: [0.022000000000000002] Molecular Basis of Inheritance
[1]1.c.iv

Give one significant contribution to the following scientists:

Sanger

Concept: undefined - undefined
Chapter: [0.022000000000000002] Molecular Basis of Inheritance
[2]1.d
[1]1.d.i

Define the Carrying capacity.

Concept: undefined - undefined
Chapter: [0.051] Organisms and Populations
[1]1.d.ii

Define the Homologous chromosomes

Concept: undefined - undefined
Chapter: [0.021] 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: undefined - undefined
Chapter: [0.032] 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: undefined - undefined
Chapter: [0.052000000000000005] Ecosystem
Part-II Section-A
[2]2

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

Concept: undefined - undefined
Chapter: [0.032] Strategies for Enhancement in Food Production
[2]3

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

Concept: undefined - undefined
Chapter: [0.032] Strategies for Enhancement in Food Production
[2]4
[2]4.a

List four reasons for drug addiction.

Concept: undefined - undefined
Chapter: [0.031] Human Health and Diseases
OR
[2]4.b

List four effects of alcoholism on human health.

Concept: undefined - undefined
Chapter: [0.031] Human Health and Diseases
[2]5

State four features of flowers pollinated by insects.

Concept: undefined - undefined
Chapter: [0.012] Sexual Reproduction in Flowering Plants
[2]6

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

Concept: undefined - undefined
Chapter: [0.051] Organisms and Populations
[2]7

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

Concept: undefined - undefined
Chapter: [0.031] 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: undefined - undefined
Chapter: [0.042] Biotechnology and Its Applications
OR
[2]8.b

Write a short note on Electrophoresis.

Concept: undefined - undefined
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
Section-B
[3]9

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

Concept: undefined - undefined
Chapter: [0.023] Evolution
[3]10
[3]10.a

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

Concept: undefined - undefined
Chapter: [0.012] Sexual Reproduction in Flowering Plants
OR
[3]10.b

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

Concept: undefined - undefined
Chapter: [0.013000000000000001] Human Reproduction
[3]11

Describe the structure of a nucleosome.

Concept: undefined - undefined
Chapter: [0.022000000000000002] Molecular Basis of Inheritance
[3]12
[3]12.a

Explain the Rivet Popper hypothesis.

Concept: undefined - undefined
Chapter: [0.053] Biodiversity and Its Conservation
OR
[3]12.b
[1]12.b.i

 Define the Standing crop

Concept: undefined - undefined
Chapter: [0.052000000000000005] Ecosystem
[1]12.b.ii

Define the Stenothermal organisms

Concept: undefined - undefined
Chapter: [0.051] Organisms and Populations
[1]12.b.iii

Define Niche. 

Concept: undefined - undefined
Chapter: [0.051] Organisms and Populations
[3]13
[0.5]13.a

Give the biological name of the following:

The mould from which penicillin is obtained.

Concept: undefined - undefined
Chapter: [0.033] Microbes in Human Welfare
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[0.5]13.b

Give the biological name of the following: 

Baker’s yeast

Concept: undefined - undefined
Chapter: [0.011000000000000001] 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: undefined - undefined
Chapter: [0.033] Microbes in Human Welfare
[0.5]13.d

Give the biological name of the following: 

The microbe used to produce Swiss cheese.

Concept: undefined - undefined
Chapter: [0.033] 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: undefined - undefined
Chapter: [0.033] 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: undefined - undefined
Chapter: [0.033] Microbes in Human Welfare
[3]14

Explain the different types of endosperms in angiosperms. 

Concept: undefined - undefined
Chapter: [0.012] 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: undefined - undefined
Chapter: [0.021] Principles of Inheritance and Variation
Section-C
[5]16
[5]16.a

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

Concept: undefined - undefined
Chapter: [0.013000000000000001] Human Reproduction
OR
[5]16.b
[1]16.b.i

Define and give the role of amniocentesis.

Concept: undefined - undefined
Chapter: [0.013999999999999999] Reproductive Health [0.013999999999999999] Reproductive Health
[1]16.b.ii

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

Concept: undefined - undefined
Chapter: [0.013999999999999999] Reproductive Health [0.031] Human Health and Diseases
[1]16.b.iii

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

Concept: undefined - undefined
Chapter: [0.012] Sexual Reproduction in Flowering Plants
[1]16.b.iv

What are seasonal breeders? Give an example.

Concept: undefined - undefined
Chapter: [0.011000000000000001] Reproduction in Organisms
[1]16.b.v

How is the chromosome number maintained in sexually reproducing organisms?

Concept: undefined - undefined
Chapter: [0.011000000000000001] 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: undefined - undefined
Chapter: [0.040999999999999995] 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: undefined - undefined
Chapter: [0.040999999999999995] 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: undefined - undefined
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[2.5]17.b.ii

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

Concept: undefined - undefined
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[5]18
[5]18.a

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

Concept: undefined - undefined
Chapter: [0.052000000000000005] Ecosystem
OR
[5]18.b

Give a graphic representation of the phosphorus cycle in nature.

Concept: undefined - undefined
Chapter: [0.052000000000000005] Ecosystem

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