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Biology (Theory) 2014-2015 ISC (Commerce) Class 12 Question Paper Solution

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Biology (Theory)
Marks: 70Academic Year: 2014-2015
Date: March 2015

Answer all questions in Part I and six questions in Part II choosing two questions from each of the three sections A(Q2-Q4), B(Q5-Q7) . and C(Q-8-Q10)


[20]1
[4]1.1 | Give a brief answer for each of the following:
[1]1.1.1

What is heterosis?

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]1.1.2

Why is non-cyclic photo phosphorylation considered as a non-cyclic pathway?

Concept: Introduction of Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]1.1.3

Define the following:

test cross.

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [2.01] Principles of Inheritance and Variation
[1]1.1.4

What are introns?

Concept: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance
[4]1.2 | Each of the following question(s)/statement(s) has four suggested answers. Choose the correct option in each case.
[1]1.2.1

Triple Fusion involves:
(i) Fusion of one male, gamete with female gamete
(ii) Fusion of tube nucleus with generative nvcleus
(iii) Fusion of two polar nuclei.
(iv) Fusion of second male gamete with two polar nuclei

Concept: Double Fertilisation
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]1.2.2

An EEG represents spontaneous electrical activity of the:
(i)  Kidney 
(ii) Spinal cord
(iii) Heart
(iv) Brain

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[1]1.2.3

The genotype of a person withTumer's syndrome will be:
(i)   44+XXY
(ii)  44+XYY
(iii) 44+XO
(iv) 44+XXYY

Concept: Genetic Disorders - Chromosomal Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[1]1.2.4

Transcription is the transfer of genetic code from a DNA molecule to:
(i) RNA molecule
(ii) Second DNA molecule
(iii) Ribosomal sub unit·
(iv) Sequence of amino acids in a protein molecule

Concept: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance
[4]1.3 | Give a scientific term for each of the following:
[1]1.3.1

Scientific term for the first formed category of photosynthetic organisms.

Concept: Energy Flow
Chapter: [5.02] Ecosystem
[1]1.3.2

Scientific term for the surgical removal of a section of fallopian tube.

Concept: Fertilisation and Implantation
Chapter: [1.03] Human Reproduction
[1]1.3.3

scientific term for an animal behaviour which benefits others but is of no advantage to itself.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]1.3.4

Scientific term for the hydrostatic pressure developed inside the cell on the cell wall due to endosmosis.

Concept: Stem Cell Technology
Chapter: [4.02] Biotechnology and Its Applications
[4]1.4 | Expand the following abbreviations:
[1]1.4.1

Expand the STD

Concept: Sexually Transmitted Diseases (STDs)
Chapter: [1.04] Reproductive Health
[1]1.4.2

Expand NADP

Concept: Energy Flow
Chapter: [5.02] Ecosystem
[1]1.4.3

Expand MRI

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[1]1.4.4

Expand DDT

Concept: Microbes in Industrial Production
Chapter: [3.03] Microbes in Human Welfare
[4]1.5 | Name the scientists who· are associated with the following:
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[1]1.5.1

Name the scientists who Discovered the fossil of Australopithecus

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[1]1.5.2

Name the scientists : Microspheres 

Concept: Ecosystem – Structure and Function
Chapter: [5.02] Ecosystem
[1]1.5.3

Name the scientists who Coined the term Diffusion Pressure Deficit

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]1.5.4

Name the scientists who Invented the CT scan

Concept: Introduction of Human Health and Diseases
Chapter: [3.01] Human Health and Diseases
[5]2
[3]2.1

Give any three characters that have developed during human evolution

Concept: Evolution Stages
Chapter: [2.03] Evolution
[1]2.2

Explain the term chemogeny

Concept: Origin of Life
Chapter: [2.03] Evolution
[1]2.3

Give any two distinctive features of Dryopithecus.

Concept: Mechanism of Evolution
Chapter: [2.03] Evolution
[5]3
[3]3.1

Explain the evolution of giraffe's neck according to Lamarck's theory of evolution.

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[1]3.2

Give two chromosomal similarities between man and apes.

Concept: Modern Synthetic Theory of Evolution
Chapter: [2.03] Evolution
[1]3.3

Name any two temporary embryonic structures in vertebrates which provide evidence for evolution.

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[5]4
[3]4.1

Persons suffering from sickle cell anaemia are at an advantage in Malaria infested areas. Explain .

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[1]4.2

Define the term gene flow

Concept: Gene Flow and Genetic Drift
Chapter: [2.03] Evolution
[1]4.3

What are analogous organs? Describe with one example from the plant kingdom.

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[10]5
[4]5.1

With the help of diagrams, name and describe the different types of placentation seen in angiosperms.

Concept: Introduction of Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[4]5.2

Give four points of anatomical differences between a monocot stem and a dicot stem

Concept: Stem Cell Technology
Chapter: [4.02] Biotechnology and Its Applications
[2]5.3 | Define the following terms: ·
[1]5.3.1

Define Racemose inflorescence

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]5.3.2

Define Osmotic pressure

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
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[10]6
[4]6.1

Draw a diagram of the internal structure of the human ovary.

Concept: Microscopic Anatomy of Ovary
Chapter: [1.03] Human Reproduction
[4]6.2

Define the term water potential.

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production

What are components of water potential? Explain

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]6.3 | Give definition and importance of:
[1]6.3.1

Definition and importance of Imbibition

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]6.3.2

Definition and importance of Parturition

Concept: Fertilisation and Implantation
Chapter: [1.03] Human Reproduction
[10]7
[4]7.1

Give four adaptations in flowers pollinated by insects.

Concept: Adaptive Radiation
Chapter: [2.03] Evolution
[4]7.2

Describe the mass flow hypothesis for translocation of organic solutes (food) in plants.

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]7.3

Write a brief note on the causes of infertility.

Concept: Infertility
Chapter: [1.04] Reproductive Health
[10]8
[4]8.1

Give any four reasons for Mendel's success.

Concept: Mendel’s Laws of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[4]8.2

Briefly describe the technique employed in DNA fingerprinting.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance
[2]8.3

Give any two features of Genetic Code.

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [2.02] Molecular Basis of Inheritance
[10]9
[4]9.1

Explain the mechanism of action of T cells to antigens.

Concept: Introduction of Molecular Basis of Inheritance
Chapter: [2.02] Molecular Basis of Inheritance
[4]9.2

Explain how insulin can be produced using recombinant DNA  technology.

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Applications
[2]9.3

What is pisiculture? Give one advantage.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[10]10
[4]10.1

Name the causative organism and preventive measures for Swine flu

Concept: Infectious and Non Infectious Disease
Chapter: [3.01] Human Health and Diseases

Name the causative organism and preventive measures for Typhoid

Concept: Infectious and Non Infectious Disease
Chapter: [3.01] Human Health and Diseases

Name the causative organism and preventive measures for Filariasis

Concept: Infectious and Non Infectious Disease
Chapter: [3.01] Human Health and Diseases

Name the causative organism and preventive measures for Syphilis

Concept: Infectious and Non Infectious Disease
Chapter: [3.01] Human Health and Diseases
[4]10.2

State four causes of population growth.

Concept: Introduction of Organisms and Populations
Chapter: [5.01] Organisms and Populations

State consequences of population growth.

Concept: Introduction of Organisms and Populations
Chapter: [5.01] Organisms and Populations
[2]10.3

Differentiate between: Cannabinoids and Barbiturates

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases

Differentiate between Biotic potential and Carrying capacity

Concept: Ecology (Organism, Population, Community and Biome)
Chapter: [5.01] Organisms and Populations
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CISCE previous year question papers Class 12 Biology (Theory) with solutions 2014 - 2015

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