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Biology 2017-2018 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology
Marks: 70 Academic Year: 2017-2018
Date & Time: 6th March 2018, 11:00 am
Duration: 3h
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[7] 1 | Select and write the most appropriate answer from the given alternatives (along with its alphabet number) for each sub-question:
[1] 1.1

The phenotypic ratio of incomplete dominance is _____________.

2 : 1

1 : 2 : 1

1 : 1 : 1

1 : 1 : 2

9 : 3 : 3 : 1

1 : 1

3 : 1

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter:
[1] 1.2

Nucleoside is a nucleotide without________.

(A) Sugar

(B) Nitrogen base

(C) Hydrogen bond

(D) Phosphate group

Concept: Structure of DNA and RNA
Chapter:
[1] 1.3

Which of the following is white button mushroom?

(A) Agaricus bisporus

(B) Pleurotus Florida

(C) Volvariella volvacea

(D) Candida species

Concept: Microbes in Household Products
Chapter:
[1] 1.4

Brown rust of wheat is caused by ________.

viruses

bacteria

fungi

aphids

Concept: Suspension Culture
Chapter:
[1] 1.5

The reaction centre of P.S. II is ________.

(A) Chl-a, 700

(B) Chl-a, 680

(C) Chl-a, 673

(D) Chl-a, 650

Concept: Pigments Are Involved in Photosynthesis
Chapter:
[1] 1.6

The enzymes required for synthesis of ATP are located on

(A) oxysomes

(B) cristae

(C) matrix

(D) ribosomes

Concept: Energy Relations - Number of ATP Molecules Generated
Chapter:
[1] 1.7

In a food chain, the herbivores are represented by

(A) producers

(B) primary consumers

(C) secondary consumers

(D) decomposers

Concept: Ecological Pyramids
Chapter: [0.14] Ecosystems and Energy Flow
[12] 2
[6] 2.1 | Answer each question in one sentence only
[1] 2.1.1

What is leaching?

Concept: Decomposition
Chapter:
[1] 2.1.2

Define chemoautotrophs

Concept: Photosynthesis as a Mean of Autotrophic Nutrition
Chapter:
[1] 2.1.3

Name the cell organelle in which Krebs’ cycle occurs.

Concept: Phases of Respiration: Tricarboxylic Acid Cycle (Citric Acid Cycle Or Kreb’s Cycle)
Chapter:
[1] 2.1.4

What is deforestation?

Concept: Deforestation and Its Causes
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[1] 2.1.5

Give the microbial source of Vit. B12

Concept: Microbes in Industrial Production
Chapter: [0.11] Enhancement of Food Production
[1] 2.1.6

What is primary treatment of sewage?

Concept: Microbes in Sewage Treatment
Chapter: [0.11] Enhancement of Food Production
[2] 2.2

Sketch and label a pollen grain of angiosperms

Concept: Pre-fertilization in Plant: Structure and Events - Stamen, Microsporangium and Pollen Grain
Chapter:
[4] 2.3 | Attempt any TWO of the following
[1] 2.3.1

Enlist the basic steps involved in recombinant DNA technology

Concept: Producing Restriction Fragments
Chapter:
[1] 2.3.2

Give two examples of microbial pesticides with their hosts.

Concept: Microbes as Biocontrol Agents
Chapter: [0.11] Enhancement of Food Production
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[1] 2.3.3

Give the significance of respiration

Concept: Human Respiratory System
Chapter: [0.08] Respiration and Circulation
[1] 2.3.4

Explain energy pyramid

Concept: Ecological Pyramids
Chapter: [0.14] Ecosystems and Energy Flow
[9] 3
[6] 3.1 | Attempt any TWO of the following
[2] 3.1.1

Describe the structure of a nucleosome.

Concept: Packaging of DNA Helix
Chapter: [0.04] Molecular Basis of Inheritance
[2] 3.1.2

Describe the steps of PCR technique.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[2] 3.1.3

Describe different steps involved in tissue culture technique

Concept: Tissue Culture
Chapter: [0.11] Enhancement of Food Production
[3] 3.2

Sketch and label T. S. of a leaf showing Kranz anatomy.

Concept: Site of Photosynthesis
Chapter:
[7] 4 | Attempt Any One
[7] 4.1

With the help of a neat and labelled diagram describe the development of female gametophyte of
angiosperms.

Concept: Development of Female Gametophytes
Chapter:
[7] 4.2

Explain the law of independent assortment with a suitable example.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter:
[7] 5 | Select and write the most appropriate answer from the given alternatives (along with its alphabet number) for each sub-question:
[1] 5.1

_________ is used for desalination of brackish water.

Reverse osmosis

Ion – exchange

Adsorption

Electrodialysis

Concept: Water Pollution and Its Causes
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[1] 5.2

Which of the following is mesodermal is the origin?

(A) Retina

(B) Enamel of teeth

(C) Heart

(D) Liver

Concept: Circulatory Pathways - Human Circulatory System
Chapter:
[1] 5.3

______ is an exotic breed of cow

(A) Gir

(B) Sindhi

(C) Sahiwal

(D) Jersy

Concept: Animal Husbandry (Livestock)
Chapter: [0.11] Enhancement of Food Production
[1] 5.4

_______ maintains basic metabolic rate.

(A) Thyroxine

(B) ADH

(C) GH

(D) Oxytocin

Concept: Human Endocrine System
Chapter: [0.09] Control and Co-ordination
[1] 5.5

Which of the following is an example of ZW – ZZ type of mechanism of sex determination?

Honeybee

Fish

Bird

Human being

Concept: Sex Determination
Chapter: [0.03] Inheritance and Variation
[1] 5.6

Transfer of gene between the population that differ genetically from one another is called _____.

(A) Gene mutation

(B) Gene flow

(C) Genetic drift

(D) Genetic recombination

Concept: Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life
[1] 5.7

In the given diagram of vaccine manufacturing process ‘A’ is ____________.

Antigen

Antibody

Antitoxin

Antibiotics

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[12] 6
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[6] 6.1 | Answer the following questions in only ‘one’ sentence each
[1] 6.1.1

Longer toes and long prehensile tail indicate which adaptation?

Concept: Human Evolution
Chapter: [0.05] Origin and Evolution of Life
[1] 6.1.2

What does IUCD indicate?

Concept: Reproductive Health
Chapter: [0.02] Reproduction in Lower and Higher Animals
[1] 6.1.3

Name of the valve between the left atrium and left ventricle and give its significance.

Concept: Circulatory Pathways - Human Circulatory System
Chapter:
[1] 6.1.4

Give the use of bovine growth hormone

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[1] 6.1.5

State any two symptoms of Down’s syndrome.

Concept: Genetic Disorders
Chapter: [0.03] Inheritance and Variation
[1] 6.1.6

Distinguish between ape and man.

Concept: Human Evolution
Chapter: [0.05] Origin and Evolution of Life
[2] 6.2

Sketch and label structure of Antibody

Concept: Immunity
Chapter: [0.1] Human Health and Diseases
[4] 6.3 | Attempt any TWO of the following
[2] 6.3.1

Name the causative organism and preventive measures for Typhoid

Concept: Disease
Chapter: [0.1] Human Health and Diseases

Draw Diagram of the causative organism of typhoid (Salmonella typhi)

Concept: Immunity
Chapter: [0.1] Human Health and Diseases
[2] 6.3.2

State the economic importance of lac culture.

Concept: Animal Husbandry (Livestock)
Chapter: [0.11] Enhancement of Food Production
[2] 6.3.3

All organisms produce more young ones. Comment

Concept: Theories of Evolution: Darwinism or Theory of Natural Selection
Chapter: [0.05] Origin and Evolution of Life
[2] 6.3.4

Describe agranulocytes with the help of diagrams.

Concept: Lymph and Lymphatic System
Chapter: [0.08] Respiration and Circulation
[9] 7 | Attempt Any One
[6] 7.1
[2] 7.1.1

Define the following term and give one example for each:

Parasitism

Concept: Population Interactions
Chapter: [0.13] Organisms and Populations
[2] 7.1.2

Describe the structure of chromosomes with a suitable diagram.

Concept: Chromosomal Theory of Inheritance
Chapter: [0.03] Inheritance and Variation
[2] 7.1.3

Define ‘genomics’. Give any ‘two’ applications of it.

Concept: Human Genome Project
Chapter: [0.04] Molecular Basis of Inheritance
[3] 7.2

Sketch and label the structure of Malpighian body.

Concept: Regulation of Kidney Function
Chapter: [10.02] Excretion and Osmoregulation
[7] 8 | Attempt Any One
[7] 8.1

Describe the T.S. of human testis

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

Write a note on human sperm

Concept: Human Reproductive System - Male Reproductive System
Chapter: [0.02] Reproduction in Lower and Higher Animals
[7] 8.2

Draw labelled diagrams of the following: Eye

Concept: Human Eye: Structure of the Eye
Chapter: [0.09] Control and Co-ordination

Describe the anatomy of the human eye.

Concept: Human Eye: Structure of the Eye
Chapter: [0.09] Control and Co-ordination

Explain the mechanism of vision.

Concept: Human Eye: Structure of the Eye
Chapter: [0.09] Control and Co-ordination
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