HSC Science (General) 12th Board ExamMaharashtra State Board
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Question Paper Solutions - Biology 2012 - 2013 HSC Science (General) 12th Board Exam

SubjectBiology
Year2012 - 2013 (October)

Marks: 70
[7]1 | Attempt any one
[7]1.1

Work out a typical Mendelian dihybrid cross and state the law that he derived from it.

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[7]1.2

What is Bacteriophage?

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

Sketch and label lytic cycle.

Chapter: [2.01] Biotechnology - Process and Application
Concept: Preparing and Cloning a DNA Library
[7]2 | Select and write the most appropriate answer from the given alternatives for each sub-question:
[1]2.1

Which one of the following is an example of multiple alleles?

(a) Height in pea plant

(b) Hair colour in cattle

(c) Petal colour in four o'clock plant

(d) Wing-size in Drosophila

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Mendel’s Laws of Inheritance
[1]2.2

The harmful radiations absorbed by the ozone layer are_____

(a) X-rays

(b) visible light

(c) Ultraviolet (UV) rays

(d) gamma rays

Chapter: [5.04] Environmental Issues
Concept: Ozone - Ozone Depletion in the Stratosphere
[1]2.3

The micro-organism used in the production of acetic acid is_____

(a) Aspergillus niger

(b) Rhizopus arrhizus

(c) Neurospora gossypii

(d) Acetobacter aceti

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Household Products
[1]2.4

The adenosine triphosphate (ATP) gain during glycolysis, connecting
link and Krebs' cycle respectively are ___

(a) 8, 6, 24

(b) 8, 24, 6

(c) 24, 8, 6

(d) 6, 8 24

Chapter: [14] Respiration in Plants
Concept: Glycolysis
[1]2.5

Guano deposits are rich in ________

(a) sulphur

(b) phosphorus

(c) calcium

(d) magnesium

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production
[1]2.6

How many meiotic divisions are required for the formation of 100 seeds?

(a) 25

(b) 50

(c) 100

(d) 125

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[1]2.7

During fertilisation male gamete are carried by pollen tube. This is called

(a) syngamy

(b) siphonogamy

(c) mesogamy

(d) polygamy

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[12]3
[6]3.1 | Answer in 'ONE' sentence each :
[1]3.1.1

Define 'microsporogenesis'.

Chapter: [1.01] Reproduction in Organisms
Concept: Asexual Reproduction
[1]3.1.2

Define 'Greenhouse effect'.

Chapter: [5.04] Environmental Issues
Concept: Greenhouse Effect and Climate Change
[1]3.1.3

Name any two edible mushrooms.

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Household Products
[1]3.1.4

Name the reactions when a-ketoglutarate is converted to succinyl Co-A in Krebs' cycle

Chapter: [14] Respiration in Plants
Concept: Glycolysis
[1]3.1.5

What is amphimixis?

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Transcription - Introduction of Transcription
[1]3.1.6

What is heterocyst?

Chapter: [13] Photosynthesis in Higher Plants
Concept: Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation
[6]3.2

Sketch and label the ‘Ultrastructure of Mitochondrion’.

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Structure of DNA and RNA
[4]3.3 | Attempt Any TWO of the following:
[2]3.3.1

Give advantages of single cell protein (SCP).

Chapter: [3.01] Enhancement in Food Production
Concept: Single Cell Protein (SCP)
[2]3.3.2

Explain the concept of primary productivity

Chapter: [5.02] Ecosystem
Concept: Productivity
[2]3.3.3

With the help of suitable diagram define 'bagging' and 'tagging' of  flower.

Chapter: [4.02] Respiration
Concept: Exchange of Gases - in Plants
[2]3.3.4

Give advatages of self pollination.

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[9]4
[6]4.1 | Attempt Any TWO of the following:
[3]4.1.1

A heterozygous tall plant of pea is crossed with a dwarf plant of pea.

Calculate the phenotypic ratio of the progeny.

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]4.1.2

Distinguish between photosynthesis and aerobic respiration

Chapter: [13] Photosynthesis in Higher Plants
Concept: Photosynthesis as a Mean of Autotrophic Nutrition
[3]4.1.3

What is photorespiration?

Chapter: [4.01] Photosynthesis
Concept: Photorespiration

Give its diagrammatic representation of photorespiration?

Chapter: [4.01] Photosynthesis
Concept: Photorespiration
[3]4.2

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]5 | Attempt any one
[7]5.1

Explain the process of formation of urine with suitable diagram

Chapter: [19] Excretory Products and Their Elimination (Part B)
Concept: Urine Formation

Add a noteon composition of urine.

Chapter: [19] Excretory Products and Their Elimination (Part B)
Concept: Urine Formation
[7]5.2

Describe the changes involved during gastrulation.

Chapter: [11.01] Human Reproduction
Concept: Embryo Development Upto Blastocyst Formation
[6]6 | Select and write the most appropriate answer from the given alternatives for each sub-question :
[1]6.1

The phenomenon of industrial melanism demonstrates__________

(a) natural selection

(b) induced mutations

(c) reproductive isolation

(d) geographical isolation

Chapter: [2.03] Evolution
Concept: Introduction of Evolution and Origin of Universe and Earth
[1]6.2

a·1 antitrypsin is used in the treatment of_____

(a) Phenylketonuria

(b) Cystic fibrosis

(c) Emphysema

(d) Haemophilia

Chapter: [9.01] Human Health and Diseases
Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
[1]6.3

Charas, hashish, ganja are obtained from __________

(a) Papaver somnjferum

(b) Erythroxylum coca

(c) Atropa belladonna

(d) Cannabis sativa

 

Chapter: [9.01] Human Health and Diseases
Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
[1]6.4

The catecholamines are secreted by_________.

(a) adrenal cortex

(b) adrenal medulla

(c) thymus

(d) pancreas

Chapter: [5.07] Chemical Co-ordination and Integration
Concept: Endocrine Glands and Hormones
[1]6.5

Which of the following are 'scavenger cells'?

(a) Lymphocytes

(b) Erythrocytes

(c) Basophils

(d) Macrophages

Chapter: [10.01] Circulation
Concept: Lymph (Tissue Fluid)
[1]6.6

The pairing of homologous chromosomes is call______

(a) crossing over

(b) terminalization

(c) synapsis

(d) bivalent

Chapter: [8.01] Genetic Engineering and Genomics
Concept: Human Genome Project
[1]6.7

Hot spot method of in situ conservation protects_____ species in its own habitat.

(a) vulnerable

(b) rare

(c) indeterminate

(d) endangered

Chapter: [5.03] Biodiversity and Its Conservation
Concept: Biodiversity Conservation
[12]7
[6]7.1 | Answer in 'ONE' sentence each :
[1]7.1.1

name the radioactive probe used in lndia for DNA fingerprinting

Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting
[1]7.1.2

Name the viral diseases in poultry animals

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[1]7.1.3

Give examples of unconditional reflexes

Chapter: [21] Neural Control and Coordination (Part B)
Concept: Reflex Action and Reflex Arc
[1]7.1.4

What is vaccine?

Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Medicine
[1]7.1.5

Name the disorder caused by under secretion of thyroxine in children

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Genetic Disorders - Mendelian Disorders
[1]7.1.6

Why only left ovary and oviduct arc present in birds?

Chapter: [2.03] Evolution
Concept: Modern Synthetic Theory of Evolution
[2]7.2

Give the graphical representation of Hardy· Weinberg's principle in the form of Punnet Square.

Chapter: [2.03] Evolution
Concept: Hardy - Weinberg'S Principle
[4]7.3 | Attempt Any TWO of the following :
[2]7.3.1

Explain the technique of multiple ovulation embryo transfer (MOET) in animal breeding.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[2]7.3.2

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

Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Medicine
[2]7.3.3

Describe the structure of blastula.

Chapter: [11.01] Human Reproduction
Concept: Embryo Development Upto Blastocyst Formation
[2]7.3.4

Give the importance of fossil in support of organic evolution

Chapter: [2.03] Evolution
Concept: Evidences for Evolution
[9]8
[6]8.1 | Attempt Any TWO of the following :
[3]8.1.1

Describe the antigen-antibody complex

Chapter: [3.01] Human Health and Diseases
Concept: Concept of Immunity
[3]8.1.2

Distinguish between ape and man.

Chapter: [7.01] Origin and the Evolution of Life
Concept: Origin and Evolution of Man
[3]8.1.3

Give the effects of water pollution on human health

Chapter: [12.01] Organisms and Environment 2
Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
[3]8.2

Draw labelled diagrams of the following: Eye

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