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Biology All India Set 2 2017-2018 CBSE (Science) Class 12 Question Paper Solution

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Biology
All India Set 2
2017-2018 March
Marks: 70

[1]1

Mention the chemical change that proinsulin undergoes, to be able to act as mature insulin

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
[1]2

Write the names of the following:

A 15 mya primate that was ape-like

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution

Write the names of the following:

A 2 mya primate that lived in East African grasslands

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution
[1]3

Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[1]4

How do cytokine barriers provide innate immunity in humans?

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[2]5

Write the dual purpose served by Deoxyribonucleoside triphosphates in the polymerisation.

Concept: Structure of Nucleotide
Chapter: [2.02] Molecular Basis of Inheritance
[2]6

Name the source plant of heroin drug. How is it obtained from the plant?

Concept: Drugs and Alcohol Abuse - Effects of Drug/Alcohol Abuse
Chapter: [3.01] Human Health and Diseases

Write the effects of heroin on the human body.

Concept: Drugs and Alcohol Abuse - Effects of Drug/Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
[2]7

You have obtained a high yielding variety of tomato. Name and explain the procedure that ensures retention of the desired characteristics repeatedly in large populations of future generations of the tomato crop.

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]8 | Attempt any one of the following
[2]8.1

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?

Concept: Hardy - Weinberg'S Principle
Chapter: [2.03] Evolution
[2]8.2

Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.

Concept: The DNA - Packaging of Dna Helix
Chapter: [2.02] Molecular Basis of Inheritance
[2]9

How did a citizen group called Friends of Arcata Marsh Arcata, California, USA, help to improve the water quality of the marshland using Integrated Waste Water Treatment? Explain in four steps.

Concept: Water Pollution and Its Control - A Case Study of Integrated Waste Water Treatment
Chapter: [5.04] Environmental Issues
[2]10

Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.

1) Recommend two microbes that can enrich the soil with nitrogen

2) Why do leguminous crops not require such enrichment of the soil? 

Concept: Microbes as Biofertilisers
Chapter: [3.03] Microbes in Human Welfare
[3]11

Differentiate between Parthenocarpy and Parthenogenesis. Give one example of each.

Concept: Introduction of Sexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[3]12

Medically it is advised to all young mothers that breastfeeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.

Concept: Pregnancy and Embryonic Development
Chapter: [1.03] Human Reproduction
[3]13

Draw a diagram of a mature human sperm. Label any three parts and write their functions.

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction
[3]14 | Attempt any one of the following
[3]14.1

Expand VNTR and describe its role in DNA fingerprinting.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance
[3]14.2

Give the applications of DNA fingerprinting technique.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance
[3]15 | Attempt any one of the following
[3]15.1

Organic farmers prefer biological control of diseases and pests to the use of chemicals for the same purpose. Justify.

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[3]15.2

Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[3]16
[3]16.1

Explain the roles of the following with the help of an example each in recombinant DNA technology :

Restriction Enzymes

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[3]16.2

Explain the roles of the following with the help of an example each in recombinant DNA technology :

Plasmids

Concept: Tools of Recombinant Dna Technology - Competent Host (For Transformation with Recombinant Dna)
Chapter: [4.01] Biotechnology - Principles and Processes
[3]17

Explain out-breeding, out-crossing and cross-breeding practices in normal husbandry.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]18

Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?

Concept: Sex Determination - Introduction of Sex Determination
Chapter: [2.01] Principles of Inheritance and Variation
[3]19
[3]19.1

How has the development of bioreactor helped in biotechnology?

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[3]19.2

Name the most commonly used bioreactor and describe its working.

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[3]20

How has the use of Agrobacterium as vectors helped in controlling Meloidegyne incognitia infestation in tobacco plants? Explain in correct sequence.

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[3]21
[3]21.1

Differentiate between analogous and homologous structures.

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[3]21.2

Select and write analogous structures from the list given below :

1) Wings of butterfly and birds

2) Vertebrate hearts

3) Tendrils of Bougainvillea and Cucurbita

4) Tubers of sweet potato and potato

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[3]22 | Attempt any one of the following
[3]22.1

'India has greater ecosystem diversity than Norway." Do you agree with the statement? Give reasons in support of your answer.

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
[3]22.2

Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisation.

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
[3]22.3

Explain the effect on the characteristics of a river when urban sewage is discharged into it.

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
[4]23

Looking at the deteriorating air quality because of air pollution in many cities of the country, the citizens are very much worried and concerned about their health. The doctors have declared the health emergency in the cities where the air quality is very severely poor.

1) Mention any two major causes of air pollution.

2) Write any two harmful effects of air pollution to plants and humans.

3) As a captain of your school Eco-club, suggest any two programmes you would plan to organise in the school so as to bring awareness among the students on how to check air pollution in and around the school.

 

Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
Chapter: [5.04] Environmental Issues
[5]24 | Attempt any one of the following
[5]24.1
[5]24.1.1

Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.

1) Regulate

2) Conform

3) Migrate

4) Suspend

Concept: Organism and Its Environment - Major Abiotic Factors
Chapter: [5.01] Organisms and Populations
[5]24.1.2

If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of the population of butterflies during that period.

Concept: Population - Population Growth
Chapter: [5.01] Organisms and Populations
[5]24.2
[5]24.2.1

What is a trophic level in an ecosystem? What is 'standing crop' with reference to it?

Concept: Ecosystem – Structure and Function
Chapter: [5.02] Ecosystem
[5]24.2.2

Explain the role of the 'first trophic level' in an ecosystem.

Concept: Ecosystem – Structure and Function
Chapter: [5.02] Ecosystem
[5]24.2.3

How is the detritus food chain connected with the grazing food chain in a natural ecosystem?

Concept: Ecosystem – Structure and Function
Chapter: [5.02] Ecosystem
[5]25
[5]25.1

Describe any two devices in a flowering plant which prevent both autogamy and geitonogamy.

Concept: Double Fertilisation
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[5]25.2

Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
 

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[5]25.2.1

Explain menstrual cycle in human females.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[5]25.2.2

How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[5]26 | Attempt any one of the following
[5]26.1

Write the scientific name of the organism Thomas Hunt Morgan and his colleagues worked with for their experiments. Explain the correlation between linkage and recombination with respect to genes as studied by them.

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [2.01] Principles of Inheritance and Variation
[5]26.2

How did Sturtevant explain gene mapping while working with Morgan?

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [2.01] Principles of Inheritance and Variation
[5]26.2.1

State the 'Central dogma' as proposed by Francis Crick. Are there any exceptions to it? Support your answer with a reason and an example.

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [2.02] Molecular Basis of Inheritance
[5]26.2.2

Explain how the biochemical characterisation (nature) of 'Transforming Principle' was determined, which was not defined from Griffth's experiments.

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [2.02] Molecular Basis of Inheritance

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