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

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Biology
2017-2018 March
Marks: 70

[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

(i) The phenotypic ratio of incomplete dominance is _____________.

(a) 2 : 1

(b) 1 : 2 : 1

(c) 1 : 1 : 1

(d) 1 : 1 : 2

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

Nucleoside is a nucleotide without________.

(A) Sugar

(B) Nitrogen base

(C) Hydrogen bond

(D) Phosphate group

Concept: Structure of DNA and RNA
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[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: [3.02] Microbes in Human Welfare
[1]1.4

Brown rust of wheat is caused by ________.

(A) viruses

(B) bacteria

(C) fungi

(D) aphids

Concept: Suspension Culture
Chapter: [3.01] Enhancement in Food Production
[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: [4.01] Photosynthesis
[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: [4.02] Respiration
[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: [6.01] Organisms and Environment 1 - Habitat and Niche
[12]2
[6]2.1 | Answer each question in one sentence only
[1]2.1.1

What is leaching?

Concept: Decomposition
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[1]2.1.2

Define chemoautotrophs

Concept: Photosynthesis as a Mean of Autotrophic Nutrition
Chapter: [4.01] Photosynthesis
[1]2.1.3

Name the cell organelle in which Krebs’ cycle occurs.

Concept: Aerobic Respiration - Tricarboxylic Acid Cycle
Chapter: [4.02] Respiration
[1]2.1.4

What is deforestation?

Concept: Deforestation
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[1]2.1.5

Give the microbial source of Vit. B12

Concept: Microbes in Industrial Production
Chapter: [3.02] Microbes in Human Welfare
[1]2.1.6

What is primary treatment of sewage?

Concept: Microbes in Sewage Treatment
Chapter: [3.02] Microbes in Human Welfare
[2]2.2

Sketch and label a pollen grain of angiosperms

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [5.01] Reproduction in Plants
[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: [2.01] Biotechnology - Process and Application
[1]2.3.2

Give two examples of microbial pesticides with their hosts.

Concept: Microbes as Biocontrol Agents
Chapter: [3.02] Microbes in Human Welfare
[1]2.3.3

Give the significance of respiration

Concept: Significance of Respiration
Chapter: [4.02] Respiration
[1]2.3.4

Explain energy pyramid

Concept: Ecological Pyramids
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[9]3
[6]3.1 | Attempt any TWO of the following
[2]3.1.1

Describe the structure of a nucleosome.

Concept: The DNA - Packaging of Dna Helix
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[2]3.1.2

Describe the steps of PCR technique.

Concept: Gene Amplification (PCR)
Chapter: [2.01] Biotechnology - Process and Application
[2]3.1.3

Describe different steps involved in tissue culture technique

Concept: Tissue Culture
Chapter: [3.01] Enhancement in Food Production
[3]3.2

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

Concept: Site of Photosynthesis
Chapter: [4.01] Photosynthesis
[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: [5.01] Reproduction in Plants
[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: [1.01] Genetic Basis of Inheritance
[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

(A) Reverse osmosis

(B) Ion – exchange

(C) Adsorption

(D) Electrodialysis

Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [12.01] Organisms and Environment 2
[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: [10.01] Circulation
[1]5.3

______ is an exotic breed of cow

(A) Gir

(B) Sindhi

(C) Sahiwal

(D) Jersy

Concept: Animal Husbandry
Chapter: [9.02] Animal Husbandry
[1]5.4

_______ maintains basic metabolic rate.

(A) Thyroxine

(B) ADH

(C) GH

(D) Oxytocin

Concept: Endocrine Glands and Hormones
Chapter: [10.03] Control and Co-ordination
[1]5.5

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

(A) Honeybee

(B) Fish

(C) Bird

(D) Human being

Concept: Sex Determination in Birds
Chapter: [7.02] Chromosomal Basis of Inheritance
[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: [7.01] Origin and the Evolution of Life
[1]5.7

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

(A) Antigen

(B) Antibody

(C) Antitoxin

(D) Antibiotics

Concept: Biotechnological Applications in Medicine
Chapter: [8.01] Genetic Engineering and Genomics
[12]6
[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: Origin and Evolution of Man
Chapter: [7.01] Origin and the Evolution of Life
[1]6.1.2

What does IUCD indicate?

Concept: Introduction of Reproductive Health
Chapter: [11.01] Human Reproduction
[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: [10.01] Circulation
[1]6.1.4

Give the use of bovine growth hormone

Concept: Transgenic Animals
Chapter: [8.01] Genetic Engineering and Genomics
[1]6.1.5

State any two symptoms of Down’s syndrome.

Concept: Genetic Disorders - Chromosomal Disorders
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]6.1.6

Distinguish between ape and man.

Concept: Origin and Evolution of Man
Chapter: [7.01] Origin and the Evolution of Life
[2]6.2

Sketch and label structure of Antibody

Concept: Concept of Immunity
Chapter: [9.01] 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: Infectious and Non Infectious Disease
Chapter: [9.01] Human Health and Diseases

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

Concept: Concept of Immunity
Chapter: [9.01] Human Health and Diseases
[2]6.3.2

State the economic importance of lac culture.

Concept: Animal Husbandry
Chapter: [9.02] Animal Husbandry
[2]6.3.3

All organisms produce more young ones. Comment

Concept: Darwin'S Contribution
Chapter: [7.01] Origin and the Evolution of Life
[2]6.3.4

Describe agranulocytes with the help of diagrams.

Concept: Lymph (Tissue Fluid)
Chapter: [10.01] 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 - Population Interactions
Chapter: [12.01] Organisms and Environment 2
[2]7.1.2

Describe the structure of chromosomes with a suitable diagram.

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [7.02] Chromosomal Basis of Inheritance
[2]7.1.3

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

Concept: Human Genome Project
Chapter: [8.01] Genetic Engineering and Genomics
[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: Microscopic Anatomy of Testis
Chapter: [11.01] Human Reproduction

Write a note on human sperm

Concept: The Male Reproductive System
Chapter: [11.01] Human Reproduction
[7]8.2

Draw labelled diagrams of the following: Eye

Concept: Sensory Reception and Processing - Eye - Parts of an Eye
Chapter: [10.03] Control and Co-ordination

Describe the anatomy of the human eye.

Concept: Sensory Reception and Processing - Eye - Parts of an Eye
Chapter: [10.03] Control and Co-ordination

Explain the mechanism of vision.

Concept: Sensory Reception and Processing - Eye - Parts of an Eye
Chapter: [10.03] Control and Co-ordination

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