HSC Science (General) 12th Board ExamMaharashtra State Board
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Question Paper Solutions - Biology 2016 - 2017 HSC Science (General) 12th Board Exam

SubjectBiology
Year2016 - 2017 (March)

Marks: 70
[7]1 | Select and write the most appropriate answer from the given alternatives (along with its alphabets) for each sub-question ยท:
[1]1.1

The genotype of human blood group B is

(a)  IAi

(b)  IBi

(c) IAIA

(d) ii

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

Breakdown of detritus into smaller particles is called

(a) fragmentation
(b) leaching 
(c) catabolism
(d) humification

Chapter: [2.01] Biotechnology - Process and Application
Concept: Producing Restriction Fragments
[1]1.3

In Brassica (rapeseed, mustard)........................ varietys is resistant to Aphids.

(a) Pusa A-4
(b) Pusa Gaurav
(c) Pusa Sawni
(d) . Pusa Shubra

Chapter: [3.01] Enhancement in Food Production
Concept: Plant Breeding
[1]1.4

The antibiotic chloromycetin is obtained from .............
(a) Sclerotiana libertine
(b) Aspergillus niger
(c) Streptomyces griseus
(d) Streptomyces venezuelae


Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Household Products
[1]1.5

The ________enzyme is used to cut DNA at specific point

(a) DNA polymerase
(b) Alkaline phosphatase
(c) restriction endonuclease
(d) DNA ligase

Chapter: [2.01] Biotechnology - Process and Application
Concept: Preparing and Cloning a DNA Library
[1]1.6

R. Q. for proteins is about .......................

(a) 0.7

(b) 0.8

(c) 0.9

(d) 1.0

Chapter: [3.01] Enhancement in Food Production
Concept: Single Cell Protein (SCP)
[1]1.7

Ozone depletion is occuring widely in the stratosphere, it leads to ozone hole caused mainly due to ............

(a) ethylene
(b) methane
(c) CFCs
(d) CO2

Chapter: [5.04] Environmental Issues
Concept: Ozone - Ozone Depletion in the Stratosphere
[12]2
[6]2.1 | Answer each question in 'one' sentence only
[1]2.1.1

Give an example of the source of thermostable enzyme DNA polymerase. 

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Structure of DNA and RNA
[1]2.1.2

Give an example of the non-edible or poisonous mushroom, studied by you .

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Household Products
[1]2.1.3

Name the secondary metabolites in catharanthus roseus.

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[1]2.1.4

What is ecological succession?

Chapter: [5.02] Ecosystem
Concept: Ecological Succession
[1]2.1.5

Name the organism and enzyme which bring about alcoholic fermentation of sucrose .

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Household Products
[1]2.1.6

Enlist any 'two' floral adaptations in salvia.

Chapter: [7.01] Origin and the Evolution of Life
Concept: Adaptive Radiation
[2]2.2

Explain the carbon cycle with the help of a simplified model.

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

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

Explain significance of a 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]2.3.2

Explain 'Wobble hypothesis' with the help of a suitable diagram.

Chapter: [2.01] Biotechnology - Process and Application
Concept: Preparing and Cloning a DNA Library
[2]2.3.3

What is a 'biopatent'? Explain it with a suitable example.

Chapter: [4.02] Biotechnology and Its Application
Concept: Ethical Issues
[2]2.3.4

Name the parts W, X, Y and Z from the following figure:

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[9]3
[6]3.1 | Attempt any Two of the following
[3]3.1.1

Explain replication of bacteriophage with the help of a suitable diagram.

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Replication - The Experimental Proof
[3]3.1.2

What are 'biofertilizers'? Explain them with suitable examples. 

Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Agriculture
[3]3.1.3

Differentiate between anemophily and entomophily.

Chapter: [1.01] Reproduction in Organisms
Concept: Modes of Reproduction
[3]3.2

Sketch and label V. S. of mature anatropous ovule.

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[7]4 | Attempt any one of the following
[7]4.1

What is 'photophosphorylation'?

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

Describe non-cyclic photophosphorylation with schematic representation. Give its significance.

Chapter: [13] Photosynthesis in Higher Plants
Concept: Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation
[7]4.2

What is 'RNA'?

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: General Structure, Types and Functions of RNA

Explain different types of non-genetic RNA with diagrams and functions.

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: General Structure, Types and Functions of RNA
[7]5 | Select and write the m.ost appropriate answer from the given alternatives (along with its alphabets) for each sub-question :
[1]5.1

Which. of the following has normal vision?

(a) Xc Xc
(b) Xc Y
(c) XC Xc
(d) Xc Yc

Chapter: [21] Neural Control and Coordination (Part B)
Concept: Sensory Reception and Processing - Eye - Parts of an Eye
[1]5.2

In DNA fingerprinting technique, radioactive DNA probe is obtained from______ of female banded krait snake.

(a) X chromosome
(b) Y chromoson1e
(c) X and Y chromosomes
(d) autosome

Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting
[1]5.3

Abortion in the first trimester of pregnancy may occur due to lack of___________

(a) aldosterone
(b) testosterone
(c) oestrogen
(d) progesterone

Chapter: [11.01] Human Reproduction
Concept: Parturition and Lactation
[1]5.4

________contribute about 60% of the total volume of the semen.

(a) Prostate glands
(b) Cowper's glar1ds
(c) Seminal vesicles
(d) Bartholin's glands

Chapter: [11.01] Human Reproduction
Concept: Microscopic Anatomy of Testis
[1]5.5

Lowering of blood pressure is related with the production of_____

(a) ADH
(b) ANF
(c) GH
(d) LH

Chapter: [10.01] Circulation
Concept: Heart Beat and Pulse
[1]5.6

Humtilin is used to treat_____

(a) Diabetes mellitus
(b) Diabetes insipidus
(c) I-Iepatitis
(d) Nephritis

Chapter: [9.01] Human Health and Diseases
Concept: Common Diseases in Humans
[1]5.7

The modification of original genetic make-up is focussed by_________

(a) PCR
(b) DNA fingerprinting
(c) Electrophoresis
(d) Gene therapy

Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Medicine
[13]6
[6]6.1 | Answer the .following questions only in 'one' sentence each
[1]6.1.1

Which material is used for isolation of DNA in fingerprinting technique?

Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting
[1]6.1.2

Give significance of podocyte

Chapter: [19] Excretory Products and Their Elimination (Part B)
Concept: Human Excretory System
[1]6.1.3

Define the following term and give one example for each:

Commensalism

Chapter: [5.01] Organisms and Populations
Concept: Population - Population Interactions
[1]6.1.4

Name the functions - Acrosome

Chapter: [11.01] Human Reproduction
Concept: Gametogenesis
[1]6.1.5

Distinguish between X andY chromosomes. (Mention any 'two' points.) 

Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
[1]6.1.6

Give any 'two' examples of endangered species

Chapter: [5.03] Biodiversity and Its Conservation
Concept: Endangered Organisms
[2]6.2

Sketch and Label the 'Structure of HIV'.

Chapter: [9.01] Human Health and Diseases
Concept: Common Diseases in Humans
[4]6.3 | Attempt any two of the following
[2]6.3.1

Write a note on erythrocytes.

Chapter: [3.01] Human Health and Diseases
Concept: Concept of Immunity
[2]6.3.2

What are the uses of vaccine?

Chapter: [3.01] Human Health and Diseases
Concept: Concept of Immunity
[2]6.3.3

Describe the process of budding in hydra.

Chapter: [11.01] Human Reproduction
Concept: Gametogenesis
[2]6.3.4

Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form. 

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

Explain ABO  blood group system in human being with a suitable chart.

Chapter: [18] Body Fluids and Circulation (Part A)
Concept: Blood - Blood Groups
[3]7.1.2

Describe diagrammatic representation of age structure showing declining population.

Chapter: [5.01] Organisms and Populations
Concept: Population and Ecological Adaptations
[3]7.1.3

With the help of a neat and labelled diagram, describe reflex arc.

Chapter: [21] Neural Control and Coordination (Part B)
Concept: Reflex Action and Reflex Arc
[3]7.2

Describe the human male reproductive system.

Chapter: [11.01] Human Reproduction
Concept: The Male Reproductive System
[7]8 | Attempt any one of the following
[7]8.1

Define Endocrine gland

Chapter: [5.07] Chemical Co-ordination and Integration
Concept: Endocrine Glands and Hormones

Describe the T. S. of thyroid gland

Chapter: [5.07] Chemical Co-ordination and Integration
Concept: Endocrine Glands and Hormones

add a note on deficiency of thyroxine.

Chapter: [5.07] Chemical Co-ordination and Integration
Concept: Endocrine Glands and Hormones
[7]8.2

Define organic evolution.

Chapter: [2.03] Evolution
Concept: Origin of Life

Give the principles of Darwin's theory of natural selection.

Chapter: [2.03] Evolution
Concept: Darwin'S Contribution

Objection to Darwin's theory of natural selection

Chapter: [2.03] Evolution
Concept: Darwin'S Contribution
S