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

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Biology
Marks: 80Date: 2015-10-07
Duration: 3h

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

How many meiotic divisions will be needed to produce 44 female gametophytes in angiosperms ?

11

22

44

66

Concept: Development of Female Gametophytes
Chapter: [5.01] Reproduction in Plants
[1]1.2

If the codon on m-RNA is AUG, the compatible anticodon on t-RNA is _______.

(A) UAG

(B) UAC

(C) GUA

(D) AUC

Concept: Transcription - Introduction of Transcription
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[1]1.3

_______ enzymes are used as biological scissors in r-DNA technology.

(A) Restriction endonucleases

(B) DNA ligases

(C) DNA polymerases

(D) Reverse transcriptases

Concept: Bacteriophages
Chapter: [2.01] Biotechnology - Process and Application
[1]1.4

Vegetative propagation takes place with the help of leaves in _______ plant.

(A) Kalanchoe

(B) Oxalis

(C) Cynodon

(D) Dahlia

Concept: Asexual Reproduction
Chapter: [5.01] Reproduction in Plants
[1]1.5

Trichoderma konigi is a source of _______ enzyme.

(A) invertase

(B) lipase

(C) pectinase

(D) cellulase

Concept: Microbes as Biocontrol Agents
Chapter: [3.02] Microbes in Human Welfare
[1]1.6

What is the correct sequence of the stages in bacteriophage lytic cycle?

(A) Attachment, Penetration, Lysis, Multiplication

(B) Attachment, Penetration, Multiplication, Lysis

(C) Lysis, Penetration, Multiplication, Attachment

(D) Attachment, Lysis, Multiplication, Penetration

Concept: Bacteriophages
Chapter: [2.01] Biotechnology - Process and Application
[1]1.7

Edible fruiting bodies are produced by _______.

(A) Yeast

(B) Rhizopus

(C) Nostoc

(D) Agaricus

Concept: Introduction of Strategies for Enhancement in Food Production
Chapter: [3.01] Enhancement in Food Production
[12]2
[6]2.1 | Answer each question in ‘One’ sentence only:
[2]2.1.1

Give reason :
Emasculation is done in a flower which is selected as female parent.

Concept: Plant Breeding
Chapter: [3.01] Enhancement in Food Production
[2]2.1.2

Label the parts (1) and (2) in budding of yeast cell.

Concept: Asexual Reproduction
Chapter: [5.01] Reproduction in Plants
[2]2.1.3

Enlist types of DNA library.

Concept: Preparing and Cloning a DNA Library
Chapter: [2.01] Biotechnology - Process and Application
[2]2.1.4

Define parthenocarpy.

Concept: Post-fertilisation : Structures and Events - Seed
Chapter: [5.01] Reproduction in Plants
[2]2.1.5

What is ecological succession?

Concept: Ecological Succession
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[2]2.1.6

Give the role of VAM related to soil fertility.

Concept: Population - Population Interactions
Chapter: [12.01] Organisms and Environment 2
[2]2.2

Give diagrammatic representation of pyramid of numbers.

Concept: Ecological Pyramids
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[4]2.3 | Attempt any TWO of the following:
[2]2.3.1

With the help of a suitable example, explain protandry.

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [5.01] Reproduction in Plants
[2]2.3.2

How depletion of ozone layer affects living organisms?

Concept: Ozone - Ozone Depletion in the Stratosphere
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[2]2.3.3

Give graphic representation of cyclic photophosphorylation.

Concept: Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation
Chapter: [4.01] Photosynthesis
[2]2.3.4

Explain the role of microbes in sewage treatment.

Concept: Microbes in Sewage Treatment
Chapter: [3.02] Microbes in Human Welfare
[9]3
[6]3.1 | Attempt any TWO of the following :
[3]3.1.1

Describe the steps of PCR technique.

Concept: Gene Amplification (PCR)
Chapter: [2.01] Biotechnology - Process and Application
[3]3.1.2

Write a note on multiple alleles considering example of human blood groups.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [1.01] Genetic Basis of Inheritance
[3]3.1.3

What is ‘biofortification’?

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

Which steps would you follow to develop a new variety of crop plant by selective breeding?

Concept: Plant Breeding
Chapter: [3.01] Enhancement in Food Production
[3]3.2

Sketch and label the T.S. of undehisced 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

Describe the process of glycolysis with the help of schematic representation.

Concept: Glycolysis
Chapter: [4.02] Respiration
[7]4.2

Explain semi-conservative replication of eukaryotic DNA.

Concept: Replication - The Experimental Proof
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[7]5 | Select and write the most appropriate answer from the given alternatives for each subquestion:
[1]5.1

Elephantiasis is caused by _______.

(A) Wuchereria bancrofti

(B) Plasmodium vivax

(C) Bedbug

(D) Elephant

Concept: Common Diseases in Humans
Chapter: [9.01] Human Health and Diseases
[1]5.2

Genetically engineered human insulin is obtained by inserting the gene in _______.

(A) Pancreatic cells

(B) E. coli

(C) Agrobacterium tumefaciens

(D) Drosophila melanogaster

Concept: Biotechnological Applications in Medicine
Chapter: [8.01] Genetic Engineering and Genomics
[1]5.3

Urea splitting bacteria are responsible for _______ types of stones.

(A) calcium oxalate

(B) calcium phosphate

(C) calcium carbonate

(D) struvite 

Concept: Disorders of the Excretory System
Chapter: [10.02] Excretion and Osmoregulation
[1]5.4

The connecting link between ‘ape’ and ‘man’ is _______.

(A) Dryopithecus

(B) Australopithecus

(C) Homo erectus

(D) Homo neanderthalensis

Concept: Origin and Evolution of Man
Chapter: [7.01] Origin and the Evolution of Life
[1]5.5

Crippling disease is caused due to poisoning of _______ .

(A) Arsenic

(B) Lead

(C) Mercury

(D) Selenium

Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [12.01] Organisms and Environment 2
[1]5.6

The genetic marker used as key factor in DNA fingerprinting is _______.

(A) VNTRs

(B) Exons

(C) Introns

(D) DNA probes

Concept: DNA Fingerprinting
Chapter: [8.01] Genetic Engineering and Genomics
[1]5.7

The trophoblast cells in contact with embryonal knob are called _______ .

(A) Inner mass cells

(B) Blastomere

(C) Amniogenic cells

(D) Cells of Rauber

Concept: Embryo Development Upto Blastocyst Formation
Chapter: [11.01] Human Reproduction
[12]6
[6]6.1 | Answer the following in ‘One’ sentence each:
[1]6.1.1

Mention any ‘two’ methods used to prevent spoilage of fish

Concept: Animal Husbandry
Chapter: [9.02] Animal Husbandry
[1]6.1.2

Define the term ‘genome’.

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]6.1.3

Define organic evolution.

Concept: Origin of Life
Chapter: [7.01] Origin and the Evolution of Life
[1]6.1.4

What is criss-cross inheritance?

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]6.1.5

Mention any ‘two’ functions of uterus.

Concept: Pregnancy and Embryonic Development
Chapter: [11.01] Human Reproduction
[1]6.1.6

What is Red Data Book?

Concept: Red Data Book
Chapter: [12.01] Organisms and Environment 2
[2]6.2

Sketch and label the structure of chromosome.

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [7.02] Chromosomal Basis of Inheritance
[4]6.3 | Attempt any TWO of the following:
[2]6.3.1

Explain the concept ‘survival of the fittest’.

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

Give economic importance of apiculture

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

Give the importance of transgenic animals.

Concept: Transgenic Animals
Chapter: [8.01] Genetic Engineering and Genomics
[2]6.3.4

Explain sex determination in human beings.

Concept: Sex Determination - Sex Determination in Humans
Chapter: [7.02] Chromosomal Basis of Inheritance
[9]7
[6]7.1 | Attempt any TWO of the following:
[3]7.1.1

Describe T.S. of the spinal cord.

Concept: Human Neural System
Chapter: [10.03] Control and Co-ordination
[3]7.1.2

Explain the structure of antibody.

Concept: Concept of Immunity
Chapter: [9.01] Human Health and Diseases
[3]7.1.3

Give the effects of air pollutants on human health

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 ‘L.S. of human kidney’

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 describe the internal structure of human heart.

Concept: Circulatory Pathways - Human Circulatory System
Chapter: [10.01] Circulation
[7]8.2

Describe the stages during three trimesters of pregnancy. 

Concept: Pregnancy and Embryonic Development
Chapter: [11.01] Human Reproduction

Explain the process of parturition.

Concept: Parturition and Lactation
Chapter: [11.01] Human Reproduction

Add a note on lactation.

Concept: Parturition and Lactation
Chapter: [11.01] Human Reproduction

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