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Biology 2012-2013 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology
Marks: 70 Academic Year: 2012-2013
Date: October 2012
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[7] 1 | Attempt any one
[7] 1.1

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

Concept: Extensions of Mendelian Genetics (Deviation from Mendelism)
Chapter:
[7] 1.2

What is Bacteriophage?

Concept: DNA Replication
Chapter: [0.04] Molecular Basis of Inheritance

Sketch and label lytic cycle.

Concept: Search for Genetic Material - The Genetic Material is a DNA
Chapter: [0.04] Molecular Basis of Inheritance
[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

Concept: Mendelian Inheritance - Mendel’s Laws of Heredity
Chapter: [0.03] Inheritance and Variation
[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

Concept: Ozone Layer Depletion - Ozone Depletion in the Stratosphere
Chapter:
[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

Concept: Microbes in Household Products
Chapter:
[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

Concept: Phases of Respiration: Glycolysis
Chapter:
[1] 2.5

Guano deposits are rich in ________

(a) sulphur

(b) phosphorus

(c) calcium

(d) magnesium

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

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

(a) 25

(b) 50

(c) 100

(d) 125

Concept: Parts of Flower - Essential Parts of Flower: Androecium
Chapter:
[1] 2.7

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

(a) syngamy

(b) siphonogamy

(c) mesogamy

(d) polygamy

Concept: Parts of Flower - Essential Parts of Flower: Androecium
Chapter:
[12] 3
[6] 3.1 | Answer in 'ONE' sentence each :
[1] 3.1.1

Define 'microsporogenesis'.

Concept: Pre-fertilization in Plant: Microsporangium
Chapter: [0.01] Reproduction in Lower and Higher Plants
[1] 3.1.2

Define 'Greenhouse effect'.

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

Name any two edible mushrooms.

Concept: Microbes in Household Products
Chapter:
[1] 3.1.4

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

Concept: Phases of Respiration: Glycolysis
Chapter:
[1] 3.1.5

What is amphimixis?

Concept: Protein synthesis - Transcription - Introduction of Transcription
Chapter:
[1] 3.1.6

What is heterocyst?

Concept: Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation
Chapter:
[6] 3.2

Sketch and label the ‘Ultrastructure of Mitochondrion’.

Concept: Energy Relations - Number of ATP Molecules Generated
Chapter:
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[4] 3.3 | Attempt Any TWO of the following:
[2] 3.3.1

Give advantages of single cell protein (SCP).

Concept: Single Cell Protein (SCP)
Chapter: [0.11] Enhancement of Food Production
[2] 3.3.2

Explain the concept of primary productivity

Concept: Productivity
Chapter:
[2] 3.3.3

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

Concept: Plant Breeding
Chapter: [0.11] Enhancement of Food Production
[2] 3.3.4

Give advatages of self pollination.

Concept: Parts of Flower - Essential Parts of Flower: Androecium
Chapter:
[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.

Concept: Extensions of Mendelian Genetics (Deviation from Mendelism)
Chapter:
[3] 4.1.2

Distinguish between photosynthesis and aerobic respiration

Concept: Photosynthesis as a Mean of Autotrophic Nutrition
Chapter:
[3] 4.1.3

What is photorespiration?

Concept: Photorespiration
Chapter:

Give its diagrammatic representation of photorespiration?

Concept: Photorespiration
Chapter:
[3] 4.2

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

Concept: Parts of Flower - Essential Parts of Flower: Androecium
Chapter:
[7] 5 | Attempt any one
[7] 5.1

Explain the process of formation of urine with suitable diagram

Concept: Function of the Kidney - “Production of Urine”
Chapter: [10.02] Excretion and Osmoregulation

Add a noteon composition of urine.

Concept: Function of the Kidney - “Production of Urine”
Chapter: [10.02] Excretion and Osmoregulation
[7] 5.2

Describe the changes involved during gastrulation.

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

Concept: Origin and Evolution of Universe and Earth
Chapter: [0.05] Origin and Evolution of Life
[1] 6.2

a·1 antitrypsin is used in the treatment of _______________.

Phenylketonuria

Cystic fibrosis

Emphysema

Haemophilia

Concept: Drug Abuse
Chapter: [0.1] Human Health and Diseases
[1] 6.3

Charas, hashish, ganja are obtained from __________.

Papaver somniferous

Erythroxylum coca

Atropa belladonna

Cannabis sativa

Concept: Drug Abuse
Chapter: [0.1] Human Health and Diseases
[1] 6.4

The catecholamines are secreted by _________.

adrenal cortex

adrenal medulla

thymus

pancreas

Concept: Human Endocrine Glands - Adrenal Gland (Suprarenal Gland)
Chapter: [0.09] Control and Co-ordination
[1] 6.5

Which of the following are 'scavenger cells'?

(a) Lymphocytes

(b) Erythrocytes

(c) Basophils

(d) Macrophages

Concept: Lymph and Lymphatic System
Chapter: [0.08] Respiration and Circulation
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[1] 6.6

The pairing of homologous chromosomes is call______

(a) crossing over

(b) terminalization

(c) synapsis

(d) bivalent

Concept: Human Genome Project
Chapter: [0.04] Molecular Basis of Inheritance
[1] 6.7

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

vulnerable

rare

indeterminate

endangered

Concept: Conservation of Wildlife
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[12] 7
[6] 7.1 | Answer in 'ONE' sentence each :
[1] 7.1.1

Name the radioactive probe used in India for DNA fingerprinting.

Concept: DNA Fingerprinting Technique
Chapter: [0.04] Molecular Basis of Inheritance
[1] 7.1.2

Name the viral diseases in poultry animals

Concept: Animal Husbandry (Livestock)
Chapter: [0.11] Enhancement of Food Production
[1] 7.1.3

Give examples of unconditional reflexes

Concept: Reflex and Reflex Action
Chapter: [0.09] Control and Co-ordination
[1] 7.1.4

What is vaccine?

Concept: Vaccination and Immunization
Chapter: [0.1] Human Health and Diseases
[1] 7.1.5

Name the disorder caused by under secretion of thyroxine in children

Concept: Genetic Disorders
Chapter: [0.03] Inheritance and Variation
[1] 7.1.6

Why only left ovary and oviduct arc present in birds?

Concept: Theories of Biological Evolution - Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life
[2] 7.2

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

Concept: Hardy Weinberg’s Principle
Chapter: [0.05] Origin and Evolution of Life
[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.

Concept: Animal Husbandry (Livestock)
Chapter: [0.11] Enhancement of Food Production
[2] 7.3.2

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

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[2] 7.3.3

Describe the structure of blastula.

Concept: Embryonic Development in Human
Chapter: [0.02] Reproduction in Lower and Higher Animals
[2] 7.3.4

Give the importance of fossil in support of organic evolution

Concept: Evidences for Biological Evolution
Chapter: [0.05] Origin and Evolution of Life
[9] 8
[6] 8.1 | Attempt Any TWO of the following :
[3] 8.1.1

Describe the antigen-antibody complex

Concept: Immunity
Chapter: [0.1] Human Health and Diseases
[3] 8.1.2

Distinguish between ape and man.

Concept: Origin and Evolution of Man
Chapter: [0.05] Origin and Evolution of Life
[3] 8.1.3

Give the effects of water pollution on human health

Concept: Effects of Water Pollution
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[3] 8.2

Draw labelled diagrams of the following: Eye

Concept: Human Eye: Structure of the Eye
Chapter: [0.09] Control and Co-ordination

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