HSC Science (General) 12th Board ExamMaharashtra State Board
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Question Paper Solutions - Biology 2014 - 2015 HSC Science (General) 12th Board Exam

SubjectBiology
Year2014 - 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
Chapter: [2.01] Principles of Inheritance and Variation
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[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
Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Inheritance of Two Genes - Law of Independent Assortment
[1]1.3

A fine powder of recycled modified plastic is known as___________________ .

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

The partially decomposed organic matter is formed by a process called

  1. fragmentation
  2. humification
  3. mineralisation
  4. leaching
Chapter: [5.02] Ecosystem
Concept: Productivity
[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
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Search for Genetic Material - Introduction of Search for Genetic Material
[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
Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
[1]1.7

Lever mechanism of pollination is observed in

  1. Salvia
  2. Jasmine
  3. Bougainvillea
  4. Butea
Chapter: [2] Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Pollination
[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?

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[1]2.1.2

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

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production
[1]2.1.3

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

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Production of Biogas
[1]2.1.4

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

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

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

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Double Fertilisation
[1]2.1.6

Mention any 'two' ecological services forthe benefit of mankind

Chapter: [5.02] Ecosystem
Concept: Ecosystem Services
[2]2.2

Sketch and label 'tubular tower fermenter'.

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Industrial Production
[4]2.3 | (C) Attempt any TWO of the following
[2]2.3.1

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

Chapter: [5.04] Environmental Issues
Concept: Greenhouse Effect and Climate Change
[2]2.3.2

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

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes as Biocontrol Agents
[2]2.3.3

Distinguish between light and dark reactions.

Chapter: [4.04] Respiration in Plants
Concept: Energy Relations - Number of ATP Molecules Generated
[2]2.3.4

Mendel selected the garden pea plants for his experiments. Explain

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

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

What is 'tissue culture'?

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Tissue Culture

Describe the methodology of tissue culture.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Tissue Culture
[3]3.1.3

Define vegetative propagation. 

Chapter: [1.01] Reproduction in Organisms
Concept: Asexual Reproduction

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

Chapter: [1.01] Reproduction in Organisms
Concept: Asexual Reproduction
[3]3.2

Sketch and label T.S of angiospermic anther.

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

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Replication - The Experimental Proof
[7]4.2

With the help ofschematic representation explain Krebs cycle.

Chapter: [4.04] Respiration in Plants
Concept: Energy Relations - Number of ATP Molecules Generated
[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
Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Medicine
[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
Chapter: [2.01] Principles of Inheritance and Variation
Concept: Genetic Disorders - Chromosomal Disorders
[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
Chapter: [8.01] Genetic Engineering and Genomics
Concept: Human Genome Project
[1]5.4

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

  1. Archaeopteryx
  2. fchthyostegia
  3. Seymouria
  4. Biston betularia
Chapter: [2.01] Principles of Inheritance and Variation
Concept: Inheritance of Two Genes - Linkage and Crossing Over
[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
Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[1]5.6

Normal activities of the heart are regulated by

  1. brain
  2. spinal cord
  3. modified cardiac muscles
  4. hormones
Chapter: [18] Body Fluids and Circulation (Part A)
Concept: Regulation of Cardiac Activity
[1]5.7

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

  1. mutualism
  2. competition
  3. commensalism
  4. parasitism
Chapter: [5.01] Organisms and Populations
Concept: Population - Population Interactions
[12]6
[6]6.1 | (A) Answer the following in one-sentence each:
[1]6.1.1

What is gene pool?

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

Give any 'two' names of X-linked diseases

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Genetic Disorders - Mendelian Disorders
[1]6.1.3

What does abbreviation HGP stand for?

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

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

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[1]6.1.5

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

Chapter: [18] Body Fluids and Circulation (Part A)
Concept: Regulation of Cardiac Activity
[1]6.1.6

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

Chapter: [5.03] Biodiversity and Its Conservation
Concept: Biodiversity Conservation
[2]6.2

Sketch and label ventral view of human heart.

Chapter: [18] Body Fluids and Circulation (Part A)
Concept: Circulatory Pathways - Human Circulatory System
[4]6.3 | Attempt any TWO of the following:
[2]6.3.1

Distinguish between ape and man.

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

Give the applications of DNA fingerprinting technique.

Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting
[2]6.3.3

Explain the various types of cancer

Chapter: [3.01] Human Health and Diseases
Concept: Concept of Cancer
[2]6.3.4

Give the significance of fertilisation

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

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Genetic Disorders - Mendelian Disorders
[3]7.1.2

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

Chapter: [18] Body Fluids and Circulation (Part A)
Concept: Blood - Blood Groups
[3]7.1.3

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

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

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

Chapter: [5.04] Environmental Issues
Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
[3]7.2

Sketch and label 'structure of nephron'.

Chapter: [19] Excretory Products and Their Elimination (Part B)
Concept: Human Excretory System
[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 .

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

Give any 'two' functions of cerebrum.

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

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

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