HSC Science (General) 12th Board ExamMaharashtra State Board
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Question Paper Solutions - Biology 2015 - 2016 HSC Science (General) 12th Board Exam

SubjectBiology
Year2015 - 2016 (March)

Marks: 70
[7]1 |  Select and write the most appropriate answer from the given alternatives 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

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[1]1.2

The number of purines in a segment of DNA molecule is 68. What will be the number of pyrimidines in this segment?

(a) 34

(b) 43

(c) 68

(d) 86

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Structure of DNA and RNA
[1]1.3

Alcoholic fermentation is brought about by _____________.

(a) Lactobacillus

(b) Saccharomyces

(c) Trichoderma

(d) Streptomyces

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Household Products
[1]1.4

Which of the following is not a photosynthetic pigment?

(a) Carotene

(b) Xanthophyll

(c) Phycobillins

(d) Anthocyanin

Chapter: [13] Photosynthesis in Higher Plants
Concept: Pigments Are Involved in Photosynthesis
[1]1.5

Which one of the following is a stop codon?

(a) UAG

(b) UAC

(c) AUG

(d) UCA

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Concept of Translation
[1]1.6

Pyruvate undergoes oxidative decarboxylation to produce _____________.

(a) 2-PGA

(b) α-Ketoglutarate

(c) Succinyl-Co-A

(d) Acetyl-Co-A

Chapter: [14] Respiration in Plants
Concept: Glycolysis
[1]1.7

Which day is observed as ‘World Environment Day’?

(a) 21st May

(b) 5 th June

(c) 25th September

(d) 13th December

Chapter: [5.04] Environmental Issues
Concept: Greenhouse Effect and Climate Change
[12]2
[6]2.1 | Answer in ‘one’ sentence only
[2]2.1.1

What is test cross?

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[2]2.1.2

What is mycoherbicide?

Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Agriculture
[2]2.1.3

What is Anticodon?

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Genetic Code - tRNA – the Adapter Molecule
[2]2.1.4

What is Humification?

Chapter: [5.02] Ecosystem
Concept: Decomposition
[2]2.1.5

How CO2 makes idlies puffy?

Chapter: [2.01] Biotechnology - Process and Application
Concept: Bacteriophages
[2]2.1.6

What is ecological succession?

Chapter: [5.02] Ecosystem
Concept: Ecological Succession
[2]2.2

Sketch and label the ‘Ultrastructure of Chloroplast’.

Chapter: [4.03] Photosynthesis in Higher Plants
Concept: Site of Photosynthesis
[4]2.3 | Answer the following (Any TWO)
[2]2.3.1

Write a short note on ‘Mutational breeding’.

Chapter: [3.01] Enhancement in Food Production
Concept: Plant Breeding
[2]2.3.2

Enlist the advantages of Biogas

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Production of Biogas
[2]2.3.3

Explain ‘Carbon cycle’.

Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Nutrient Cycling
[2]2.3.4

Give the floral adaptations for chiropterophily.

Chapter: [7.01] Origin and the Evolution of Life
Concept: Adaptive Radiation
[9]3
[6]3.1 |  Answer the following (Any TWO):
[3]3.1.1

Why the ratio in pleiotropy is 2 : 1? Explain it with example.

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[3]3.1.2

Give the schematic representation of TCA cycle.

Chapter: [14] Respiration in Plants
Concept: Aerobic Respiration - Tricarboxylic Acid Cycle
[3]3.1.3

Differentiate between cyclic and non-cyclic photophosphorylation.

Chapter: [13] Photosynthesis in Higher Plants
Concept: Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation
[3]3.2

Give diagrammatic representation to show a perfect pairing and any ‘two’ Wobble pairings.

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Transcription - Introduction of Transcription
[7]4 | Attempt any one of following :
[7]4.1

What is double fertilisation? Describe the process in brief.

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Double Fertilisation
[7]4.2

Define r-DNA technology.

Chapter: [2.01] Biotechnology - Process and Application
Concept: Transposons

Give the basic steps in r-DNA technology

Chapter: [2.01] Biotechnology - Process and Application
Concept: Transposons

Give any ‘three’ examples of the therapeutic products produced by r-DNA technology?

Chapter: [2.01] Biotechnology - Process and Application
Concept: Transposons
[7]5 | Select and write the most appropriate answer from the given alternatives for each sub-question
[1]5.1

If centromere is situated in the middle of the chromosome, it is called ________.

(a) Metacentric

(b) Acrocentric

(c) Submetacentric

(d) Telocentric

Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
[1]5.2

Which one of the following is useful in treatment of burns and wound healing?

(a) Tissue plasminogen activator

(b) Tissue growth factor

(c) DNAse

(d) Bovine growth hormone

Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Medicine
[1]5.3

Erythroblastosis foetalis is caused when mother is ______.

(a) Rh+ve

(b) With antibody ‘A’

(c) Rh-ve

(d) With antibody ‘B’

Chapter: [11.01] Human Reproduction
Concept: Embryo Development Upto Blastocyst Formation
[1]5.4

Deposition of fatty substances in the lining of arteries results in ______.

(a)Arteriosclerosis

(b)Atherosclerosis

(c) Hyperglycemia

(d)Hypotension

Chapter: [5.03] Body Fluids and Circulation
Concept: Disorders of Circulatory System
[1]5.5

Struggle between cow and cow for getting grass is called ________.

(a) Inter-specific struggle

(b) Environmental struggle

(c) Struggle against natural calamities

(d) Intra-specific struggle

Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Ecosystems Patterns
[1]5.6

In which type of adaptation, forelimbs are modified into wings?

(a) Aquatic adaptations

(b) Volant adaptations

(c) Arboreal adaptations

(d) Cursorial adaptations

Chapter: [7.01] Origin and the Evolution of Life
Concept: Adaptive Radiation
[1]5.7

Mating of two closely related individuals within the same breed is called ______.

(a) In-breeding

(b) Out-breeding

(c) Out-crossing

(d) Cross-breeding

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[12]6
[6]6.1 |  Answer the following in ‘one’ sentence each:
[1]6.1.1

Visit of a veterinary doctor to dairy farm is mandatory. Give reasons.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[1]6.1.2

Why aquatic animals can afford to be ammonotelic?

Chapter: [10.02] Excretion and Osmoregulation
Concept: Modes of Excretion - Ammonotelism
[1]6.1.3

Why PUC is mandatory for vehicles?

Chapter: [5.04] Environmental Issues
Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
[1]6.1.4

Define organic evolution.

Chapter: [2.03] Evolution
Concept: Origin of Life
[1]6.1.5

Give the genotype of Turner’s syndrome.

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Genetic Disorders - Chromosomal Disorders
[1]6.1.6

Write down the full form of R.F.L.P.

Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting
[2]6.2

Sketch and label T.S. of vein

Chapter: [18] Body Fluids and Circulation (Part A)
Concept: Circulatory Pathways - Human Circulatory System
[4]6.3 | Attempt any TWO of the following:
[2]6.3.1

Give any ‘two’ factors responsible for genetic variation.

Chapter: [7.01] Origin and the Evolution of Life
Concept: Gene Flow and Genetic Drift
[2]6.3.2

Give the name and function for ‘A’ and ‘B’ from the diagram given below

Chapter: [11.01] Human Reproduction
Concept: Gametogenesis
[2]6.3.3

Write a note on ‘artificial acquired active immunity’.

Chapter: [3.01] Human Health and Diseases
Concept: Concept of Immunity
[2]6.3.4

Give the economic importance of ‘fisheries’

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[9]7
[6]7.1 | Attempt any TWO of the following:
[3]7.1.1

Explain sex determination in human beings.

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Sex Determination - Sex Determination in Humans
[3]7.1.2

Describe steady population with the help of a pyramid.

Chapter: [5.01] Organisms and Populations
Concept: Population - Population Attributes
[3]7.1.3

Illustrate any ‘three’ genes which can be used in gene therapy.

Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Medicine
[3]7.2

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

Chapter: [19] Excretory Products and Their Elimination (Part B)
Concept: Human Excretory System
[7]8
[7]8.1

With the help of diagrammatic representation, explain the process of gametogenesis

Chapter: [11.01] Human Reproduction
Concept: Gametogenesis
[7]8.2

 Describe the structure of cerebrum. Add a note on its function.

Chapter: [10.03] Control and Co-ordination
Concept: Neural System
S