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Biology 2014-2015 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology
2014-2015 March
Marks: 70

[7]1 | Select and write the most appropriate answer from the given alternative for each sub-question:
[1]1.1

A cross used to verify the unknown genotype of F1 hybrid is a_______________

  1. test
  2. back
  3. dihybrid
  4. monohybrid
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [1.01] Genetic Basis of Inheritance
[1]1.2

Appearance of new combinations in F2 generation in a dihybrid cross proves the law of_____________ .

  1. dominance
  2. segregation
  3. independent assortment
  4. purity of gametes
Concept: Inheritance of Two Genes - Law of Independent Assortment
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]1.3

A fine powder of recycled modified plastic is known as___________________ .

  1. polyblend
  2. polythene
  3. polyester
  4. polymer
Concept: Solid Waste Management
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[1]1.4

The partially decomposed organic matter is formed by a process called

  1. fragmentation
  2. humification
  3. mineralisation
  4. leaching
Concept: Productivity
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[1]1.5

Transfer of genetic material into a bacterial cell through a viral vector is known as

  1. transformation
  2. transduction
  3. transfection  
  4. translation
Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[1]1.6

If the number of chromosomes in an endosperm cell is 27, what will be the chromosome number in the definitive nucleus?

  1. 9
  2. 18
  3. 27
  4. 36
Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]1.7

Lever mechanism of pollination is observed in

  1. Salvia
  2. Jasmine
  3. Bougainvillea
  4. Butea
Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [5.01] Reproduction in Plants
[12]2
[6]2.1 | Answer each question in 'one' sentence only
[1]2.1.1

A pea plant pure for yellow seed colour is crossed with a pea plant pure for green seed colour. In F1 generation all pea plants were with yellow seeds. Which law of Mendel is applicable?

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [1.01] Genetic Basis of Inheritance
[1]2.1.2

Name the enzyme responsible for delay in ripening of tomato fruit.

Concept: Introduction of Strategies for Enhancement in Food Production
Chapter: [3.01] Enhancement in Food Production
[1]2.1.3

Which are the bacteria responsible for converting organic acids into methane?

Concept: Microbes in Production of Biogas
Chapter: [3.02] Microbes in Human Welfare
[1]2.1.4

Name the high-yielding semi-dwarf varieties of wheat selected and introduced in India in 1963.

Concept: Plant Breeding
Chapter: [3.01] Enhancement in Food Production
[1]2.1.5

'Formation of primary endosperm nucleus is called triple fusion'. Give reason

Concept: Double Fertilisation
Chapter: [5.01] Reproduction in Plants
[1]2.1.6

Mention any 'two' ecological services forthe benefit of mankind

Concept: Ecosystem Services
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[2]2.2

Sketch and label 'tubular tower fermenter'.

Concept: Microbes in Industrial Production
Chapter: [3.02] Microbes in Human Welfare
[4]2.3 | (C) Attempt any TWO of the following
[2]2.3.1

Global warming is caused by'greenhouse effect'. Justify.

Concept: Greenhouse Effect and Climate Change
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[2]2.3.2

With the help of a neat and labelled diagram explain VAM (vesicular arbuscular mycorrhizae).

Concept: Microbes as Biocontrol Agents
Chapter: [3.02] Microbes in Human Welfare
[2]2.3.3

Distinguish between light and dark reactions.

Concept: Energy Relations - Number of ATP Molecules Generated
Chapter: [4.02] Respiration
[2]2.3.4

Mendel selected the garden pea plants for his experiments. Explain

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [1.01] Genetic Basis of Inheritance
[6]3
[6]3.1 | (A) Attempt any TWO of the following:
[3]3.1.1

With the help of a neat and labelled diagram describe the steps in recombinant DNA technology.

Concept: Plasmids
Chapter: [2.01] Biotechnology - Process and Application
[3]3.1.2

What is 'tissue culture'?

Concept: Tissue Culture
Chapter: [3.01] Enhancement in Food Production

Describe the methodology of tissue culture.

Concept: Tissue Culture
Chapter: [3.01] Enhancement in Food Production
[3]3.1.3

Define vegetative propagation. 

Concept: Asexual Reproduction
Chapter: [5.01] Reproduction in Plants

Differentiate between 'stem tuber' and 'tuberous root'.

Concept: Asexual Reproduction
Chapter: [5.01] Reproduction in Plants
[3]3.2

Sketch and label T.S of angiospermic anther.

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [5.01] Reproduction in Plants
[7]4 | Attempt any one of the following :
[7]4.1

With the help of a neat and labelled diagram describe Watson and Crick's model of DNA.

Concept: Replication - The Experimental Proof
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[7]4.2

With the help ofschematic representation explain Krebs cycle.

Concept: Energy Relations - Number of ATP Molecules Generated
Chapter: [4.02] Respiration
[7]5 | Select and write the most appropriate answer from the given alternatives for each sub-question :
[1]5.1

In gene therapy, DNAase is used to treat_______________ .

  1. cystic fibrosis
  2. haemophilia
  3. pituitary dwarfism
  4. insulin dependent diabetes
Concept: Biotechnological Applications in Medicine
Chapter: [8.01] Genetic Engineering and Genomics
[1]5.2

If only one 'X' chromosome is found in a female person, which of the following symptoms she will show?

  1. epicanthal skin fold
  2. webbing of neck
  3. small testis and absence of spermatogenesis
  4. presence of simian crease on the palm
Concept: Genetic Disorders - Chromosomal Disorders
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]5.3

In which of the following haploid cells a whole genome in human being is present?

  1. sperm
  2. somatic cell
  3. mature RBC
  4. primary spermatocyte
Concept: Human Genome Project
Chapter: [8.01] Genetic Engineering and Genomics
[1]5.4

Which of the following is NOT an example of connecting link?

  1. Archaeopteryx
  2. fchthyostegia
  3. Seymouria
  4. Biston betularia
Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]5.5

In____________ , superior males of one breed are mated with superior females of another breed.

  1. out crossing
  2. cross breeding
  3. out breeding
  4. inbreeding
Concept: Animal Husbandry
Chapter: [9.02] Animal Husbandry
[1]5.6

Normal activities of the heart are regulated by

  1. brain
  2. spinal cord
  3. modified cardiac muscles
  4. hormones
Concept: Regulation of Cardiac Activity
Chapter: [10.01] Circulation
[1]5.7

During .............. typs of interaction, both organisms are benefited

  1. mutualism
  2. competition
  3. commensalism
  4. parasitism
Concept: Population - Population Interactions
Chapter: [12.01] Organisms and Environment 2
[12]6
[6]6.1 | (A) Answer the following in one-sentence each:
[1]6.1.1

What is gene pool?

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]6.1.2

Give any 'two' names of X-linked diseases

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]6.1.3

What does abbreviation HGP stand for?

Concept: Human Genome Project
Chapter: [8.01] Genetic Engineering and Genomics
[1]6.1.4

Give 'two' varieties of silk which are considered  as inferior quality

Concept: Animal Husbandry
Chapter: [9.02] Animal Husbandry
[1]6.1.5

In the electrocardiogram shown below, which wave represents ventricular diastole?

Concept: Regulation of Cardiac Activity
Chapter: [10.01] Circulation
[1]6.1.6

Which method of conservation of biodiversity includes 'hotspot' method?

Concept: Biodiversity Conservation
Chapter: [12.01] Organisms and Environment 2
[2]6.2

Sketch and label ventral view of human heart.

Concept: Circulatory Pathways - Human Circulatory System
Chapter: [10.01] Circulation
[4]6.3 | Attempt any TWO of the following:
[2]6.3.1

Distinguish between ape and man.

Concept: Origin and Evolution of Man
Chapter: [7.01] Origin and the Evolution of Life
[2]6.3.2

Give the applications of DNA fingerprinting technique.

Concept: DNA Fingerprinting
Chapter: [8.01] Genetic Engineering and Genomics
[2]6.3.3

Explain the various types of cancer

Concept: Concept of Cancer
Chapter: [9.01] Human Health and Diseases
[2]6.3.4

Give the significance of fertilisation

Concept: Fertilisation and Implantation
Chapter: [11.01] Human Reproduction
[9]7
[6]7.1 | Attempt any TWO of the following
[3]7.1.1

What will be the phenotype of progeny, if a carrier haemophilic female marries a normal male?

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [7.02] Chromosomal Basis of Inheritance
[3]7.1.2

Explain with tile help of a chart, explain the compatibility of human blood groups.

Concept: Blood - Blood Groups
Chapter: [10.01] Circulation
[3]7.1.3

Justify the conservation of endangered species of plants and animals is necessary

Concept: Biodiversity Conservation
Chapter: [12.01] Organisms and Environment 2

Justify Pollution Under Control (PlUC) certificate is mandatory for all vehicles and industries

Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
Chapter: [12.01] Organisms and Environment 2
[3]7.2

Sketch and label 'structure of nephron'.

Concept: Human Excretory System
Chapter: [10.02] Excretion and Osmoregulation
[7]8 | Attempt any one of the following :
[7]8.1

With the help of a labelled diagram of lateral view of cerebrum, describe the structure .

Concept: Neural System
Chapter: [10.03] Control and Co-ordination

Give any 'two' functions of cerebrum.

Concept: Neural System
Chapter: [10.03] Control and Co-ordination
[7]8.2

With the help of a neat, labelled diagram describe the human male reproductive system.

Concept: The Male Reproductive System
Chapter: [11.01] Human Reproduction

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