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

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Biology
Marks: 70 Academic Year: 2014-2015
Date: March 2015
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[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 _______________.

Test

Back

Dihybrid

Monohybrid

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter:
[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: Mendel’s Laws of Inheritance
Chapter: [0.03] Inheritance and Variation
[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:
[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:
[1] 1.5

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

transformation

transduction

transfection  

translation

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter:
[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: Chromosomal Theory of Inheritance
Chapter: [0.03] Inheritance and Variation
[1] 1.7

Lever mechanism of pollination is observed in

  1. Salvia
  2. Jasmine
  3. Bougainvillea
  4. Butea
Concept: Pre-fertilization in Plant: Pollination
Chapter: [0.01] Reproduction in Lower and Higher 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] 2.1.2

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

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

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

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

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

Concept: Plant Breeding
Chapter: [0.11] Enhancement of Food Production
[1] 2.1.5

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

Concept: Double Fertilization in Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
[1] 2.1.6

Mention any 'two' ecological services forthe benefit of mankind

Concept: Ecosystem Services
Chapter: [0.14] Ecosystems and Energy Flow
[2] 2.2

Sketch and label 'tubular tower fermenter'.

Concept: Microbes in Industrial Production
Chapter: [0.11] Enhancement of Food Production
[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:
[2] 2.3.2

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

Concept: Microbes as Biocontrol Agents
Chapter: [0.11] Enhancement of Food Production
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[2] 2.3.3

Distinguish between light and dark reactions.

Concept: Energy Relations - Number of ATP Molecules Generated
Chapter:
[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:
[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:
[3] 3.1.2

What is 'tissue culture'?

Concept: Tissue Culture
Chapter: [0.11] Enhancement of Food Production

Describe the methodology of tissue culture.

Concept: Tissue Culture
Chapter: [0.11] Enhancement of Food Production
[3] 3.1.3

Define vegetative propagation.

Concept: Vegetative Propagation in Plant
Chapter: [0.01] Reproduction in Lower and Higher Plants

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

Concept: Asexual Reproduction in Plant
Chapter: [0.01] Reproduction in Lower and Higher Plants
[3] 3.2

Sketch and label T.S of angiospermic anther.

Concept: Pre-fertilization in Plant: Structure and Events - Stamen, Microsporangium and Pollen Grain
Chapter:
[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: DNA Replication - The Experimental Proof
Chapter:
[7] 4.2

With the help ofschematic representation explain Krebs cycle.

Concept: Energy Relations - Number of ATP Molecules Generated
Chapter:
[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 _______________.

Cystic fibrosis

Haemophilia

Pituitary dwarfism

Insulin-dependent diabetes

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[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
Chapter: [0.03] Inheritance and Variation
[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: [0.04] Molecular Basis of Inheritance
[1] 5.4

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

  1. Archaeopteryx
  2. fchthyostegia
  3. Seymouria
  4. Biston betularia
Concept: Linkage and Crossing Over
Chapter: [0.03] Inheritance and Variation
[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 (Livestock)
Chapter: [0.11] Enhancement of Food Production
[1] 5.6

Normal activities of the heart are regulated by ______________.

brain

brain

spinal cord

spinal cord

modified cardiac muscles

modified cardiac muscles

Concept: Human Heart
Chapter: [0.08] Respiration and Circulation
[1] 5.7

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

  1. mutualism
  2. competition
  3. commensalism
  4. parasitism
Concept: Population Interactions
Chapter: [0.13] Organisms and Populations
[12] 6
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[6] 6.1 | (A) Answer the following in one-sentence each:
[1] 6.1.1

What is gene pool?

Concept: Chromosomal Theory of Inheritance
Chapter: [0.03] Inheritance and Variation
[1] 6.1.2

Give any 'two' names of X-linked diseases

Concept: Genetic Disorders
Chapter: [0.03] Inheritance and Variation
[1] 6.1.3

What does abbreviation HGP stand for?

Concept: Human Genome Project
Chapter: [0.04] Molecular Basis of Inheritance
[1] 6.1.4

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

Concept: Animal Husbandry (Livestock)
Chapter: [0.11] Enhancement of Food Production
[1] 6.1.5

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

Concept: Electrocardiogram (ECG)
Chapter: [0.08] Respiration and Circulation
[1] 6.1.6

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

Concept: Conservation of Wildlife
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[2] 6.2

Sketch and label ventral view of human heart.

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

Distinguish between ape and man.

Concept: Human Evolution
Chapter: [0.05] Origin and Evolution of Life
[2] 6.3.2

Give the applications of DNA fingerprinting technique.

Concept: DNA Fingerprinting Technique
Chapter: [0.04] Molecular Basis of Inheritance
[2] 6.3.3

Explain the various types of cancer

Concept: Cancer
Chapter: [0.1] Human Health and Diseases
[2] 6.3.4

Give the significance of fertilization.

Concept: Fertilization in Human
Chapter: [0.02] Reproduction in Lower and Higher Animals
[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
Chapter: [0.03] Inheritance and Variation
[3] 7.1.2

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

Concept: Blood Circulatory System in Human
Chapter: [0.08] Respiration and Circulation
[3] 7.1.3

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

Concept: Conservation of Wildlife
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues

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

Concept: Prevention of Air Pollution
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[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: Central Nervous System (CNS): Structure of Human Brain
Chapter: [0.09] Control and Co-ordination

Give any two functions of the cerebrum.

Concept: Central Nervous System (CNS): Structure of Human Brain
Chapter: [0.09] Control and Co-ordination
[7] 8.2

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

Concept: Human Reproductive System - Male Reproductive System
Chapter: [0.02] Reproduction in Lower and Higher Animals
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