HSC Science (General) 12th Board ExamMaharashtra State Board
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Question Paper Solutions - Biology 2014 - 2015 HSC Science (General) 12th Board Exam

SubjectBiology
Year2014 - 2015 (October)

Marks: 80
[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?

(A) 11

(B) 22

(C) 44

(D) 66

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

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

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

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

(A) Kalanchoe

(B) Oxalis

(C) Cynodon

(D) Dahlia

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

Trichoderma konigi is a source of _______ enzyme.

(A) invertase

(B) lipase

(C) pectinase

(D) cellulase

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

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

Edible fruiting bodies are produced by _______.

(A) Yeast

(B) Rhizopus

(C) Nostoc

(D) Agaricus

Chapter: [3.01] Enhancement in Food Production
Concept: Introduction of Strategies for 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.

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

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

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

Enlist types of DNA library.

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

Define parthenocarpy.

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

What is ecological succession?

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

Give the role of VAM related to soil fertility.

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

Give diagrammatic representation of pyramid of numbers.

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

With the help of a suitable example, explain protandry.

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

How depletion of ozone layer affects living organisms?

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

Give graphic representation of cyclic photophosphorylation.

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

Explain the role of microbes in sewage treatment.

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

Describe the steps of PCR technique.

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

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

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

What is ‘biofortification’?

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

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

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

Sketch and label the T.S. of undehisced anther

Chapter: [5.01] Reproduction in Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[7]4 | Attempt any one of the following :
[7]4.1

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

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

Explain semi-conservative replication of eukaryotic DNA.

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Replication - The Experimental Proof
[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

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

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

Urea splitting bacteria are responsible for _______ types of stones.

(A) calcium oxalate

(B) calcium phosphate

(C) calcium carbonate

(D) struvite 

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

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

(A) Dryopithecus

(B) Australopithecus

(C) Homo erectus

(D) Homo neanderthalensis

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

Crippling disease is caused due to poisoning of _______ .

(A) Arsenic

(B) Lead

(C) Mercury

(D) Selenium

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

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

(A) VNTRs

(B) Exons

(C) Introns

(D) DNA probes

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

Chapter: [11.01] Human Reproduction
Concept: Embryo Development Upto Blastocyst Formation
[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

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

Define the term ‘genome’.

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

Define organic evolution.

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

What is criss-cross inheritance?

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

Mention any ‘two’ functions of uterus.

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

What is Red Data Book?

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

Sketch and label the structure of chromosome.

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

Explain the concept ‘survival of the fittest’.

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

Give economic importance of apiculture

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

Give the importance of transgenic animals.

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

Explain sex determination in human beings.

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

Describe T.S. of the spinal cord.

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

Explain the structure of antibody.

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

Give the effects of air pollutants on human health

Chapter: [12.01] Organisms and Environment 2
Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
[3]7.2

Sketch and label ‘L.S. of human kidney’

Chapter: [10.02] Excretion and Osmoregulation
Concept: Human Excretory System
[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.

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

Describe the stages during three trimesters of pregnancy. 

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

Explain the process of parturition.

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

Add a note on lactation.

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