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

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Biology
Marks: 80 Academic Year: 2014-2015
Date & Time: 7th October 2015, 4:00 pm
Duration: 3h
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[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:
[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: Protein synthesis - Transcription - Introduction of Transcription
Chapter:
[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: DNA Replication
Chapter: [0.04] Molecular Basis of Inheritance
[1] 1.4

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

Kalanchoe

Oxalis

Cynodon

Dahlia

Concept: Asexual Reproduction in Plant
Chapter: [0.01] Reproduction in Lower and Higher 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: [0.11] Enhancement of Food Production
[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: DNA Replication
Chapter: [0.04] Molecular Basis of Inheritance
[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:
[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: [0.11] Enhancement of Food Production
[2] 2.1.2

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

Concept: Asexual Reproduction in Plant
Chapter: [0.01] Reproduction in Lower and Higher Plants
[2] 2.1.3

Enlist types of DNA library.

Concept: The Genetic Material is a DNA
Chapter: [0.04] Molecular Basis of Inheritance
[2] 2.1.4

Define parthenocarpy.

Concept: Formation of Seed and Fruit
Chapter: [0.01] Reproduction in Lower and Higher Plants
[2] 2.1.5

What is ecological succession?

Concept: Ecological Succession
Chapter: [0.14] Ecosystems and Energy Flow
[2] 2.1.6

Give the role of VAM related to soil fertility.

Concept: Population Interactions
Chapter: [0.13] Organisms and Populations
[2] 2.2

Give diagrammatic representation of pyramid of numbers.

Concept: Ecological Pyramids
Chapter: [0.14] Ecosystems and Energy Flow
[4] 2.3 | Attempt any TWO of the following:
[2] 2.3.1

With the help of a suitable example, explain protandry.

Concept: Pre-fertilization in Plant: Pollination
Chapter: [0.01] Reproduction in Lower and Higher Plants
[2] 2.3.2

How depletion of ozone layer affects living organisms?

Concept: Ozone Layer Depletion - Ozone Depletion in the Stratosphere
Chapter:
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[2] 2.3.3

Give graphic representation of cyclic photophosphorylation.

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

Explain the role of microbes in sewage treatment.

Concept: Microbes in Sewage Treatment
Chapter: [0.11] Enhancement of Food Production
[9] 3
[6] 3.1 | Attempt any TWO of the following :
[3] 3.1.1

Describe the steps of PCR technique.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[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:
[3] 3.1.3

What is ‘biofortification’?

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

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

Concept: Plant Breeding
Chapter: [0.11] Enhancement of Food Production
[3] 3.2

Sketch and label the T.S. of undehisced 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

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

Concept: Phases of Respiration: Glycolysis
Chapter:
[7] 4.2

Explain semi-conservative replication of eukaryotic DNA.

Concept: DNA Replication - The Experimental Proof
Chapter:
[7] 5 | Select and write the most appropriate answer from the given alternatives for each subquestion:
[1] 5.1

Elephantiasis is caused by ________________.

Wuchereria bancrofti

Plasmodium vivax

Bedbug

Elephant

Concept: Disease
Chapter: [0.1] Human Health and Diseases
[1] 5.2

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

Pancreatic cells

E. coli

Agrobacterium tumefaciens

Drosophila melanogaster

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[1] 5.3

Urea splitting bacteria are responsible for _______ types of stones.

(A) calcium oxalate

(B) calcium phosphate

(C) calcium carbonate

(D) struvite 

Concept: Common Disorders of the Urinary 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: Human Evolution
Chapter: [0.05] Origin and Evolution of Life
[1] 5.5

Crippling disease is caused due to poisoning of ____________.

Arsenic

Lead

Mercury

Selenium

Concept: Disease
Chapter: [0.1] Human Health and Diseases
[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 Technique
Chapter: [0.04] Molecular Basis of Inheritance
[1] 5.7

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

Inner mass cells

Blastomere

Amniogenic cells

Cells of Rauber

Concept: Embryonic Development in Human
Chapter: [0.02] Reproduction in Lower and Higher Animals
[12] 6
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[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 (Livestock)
Chapter: [0.11] Enhancement of Food Production
[1] 6.1.2

Define the term ‘genome’.

Concept: Chromosomal Theory of Inheritance
Chapter: [0.03] Inheritance and Variation
[1] 6.1.3

Define organic evolution.

Concept: Origin of Life (Theories)
Chapter: [0.05] Origin and Evolution of Life
[1] 6.1.4

What is criss-cross inheritance?

Concept: Linkage and Crossing Over
Chapter: [0.03] Inheritance and Variation
[1] 6.1.5

Mention any ‘two’ functions of uterus.

Concept: Human Reproductive System - Female Reproductive System
Chapter: [0.02] Reproduction in Lower and Higher Animals
[1] 6.1.6

What is Red Data Book?

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

Sketch and label the structure of chromosome.

Concept: Chromosomal Theory of Inheritance
Chapter: [0.03] Inheritance and Variation
[4] 6.3 | Attempt any TWO of the following:
[2] 6.3.1

Explain the concept ‘survival of the fittest’.

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

Give economic importance of apiculture

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

Give the importance/significance of transgenic animals.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[2] 6.3.4

Explain sex determination in human beings.

Concept: Sex Determination
Chapter: [0.03] Inheritance and Variation
[9] 7
[6] 7.1 | Attempt any TWO of the following:
[3] 7.1.1

Describe T.S. of the spinal cord.

Concept: The Spinal Cord
Chapter: [0.09] Control and Co-ordination
[3] 7.1.2
[3] 7.1.3

Give the effects of air pollutants on human health

Concept: Prevention of Air Pollution
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[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:
[7] 8.2

Describe the stages during three trimesters of pregnancy. 

Concept: Pregnancy in Humans
Chapter: [0.02] Reproduction in Lower and Higher Animals

Explain the process of parturition.

Concept: Parturition (Birth) in Human
Chapter: [0.02] Reproduction in Lower and Higher Animals

Add a note on lactation.

Concept: Lactation in Human
Chapter: [0.02] Reproduction in Lower and Higher Animals
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